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THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!

 
Enchanted Wanderer
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03/27/2011 09:54 AM
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THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
PLEASE PIN THIS.. IT IS VERY IMPORTANT INFORMATION

FROM LLRC [link to www.llrc.org]

Alpha emitters, Geiger Counters
- a clarification on monitoring for radioactive pollution

The principal alpha-emitting nuclides of interest are Plutonium and Uranium. To all intents and purposes only specialised and expensive scintillation counters like the DP2 Elektra can detect them in the environment.

Even then the detector window must be within 2cm of the radioactive particle. You won't do this many times because the window on the DP2 is so thin that a blade of grass will make a hole in it, and then it has to be repaired. Cheaper (but still costly) instruments such as the Gamma Scout which claim to detect alphas might possibly have some marginal response if a particle was on the detector window, but you will still have no way to tell what it was responding to.

Gamma signals will swamp any alphas anyway. The Electromagnetic Energy of alpha decay can be detected if a detector has the right proximity to the radioactive source material. This is true for beta, gamma and neutron radiation. They have to reach the detector. In air, some EM radiation travels inches, some travels feet and some travels miles (alpha, beta, gamma, neutron respectively). Some will pass through concrete and lead; some cannot pass through skin.

Alpha radiation attenuates in air within a couple of inches. These small all purpose GM counters you are asking about are used to measure Becquerels and use a formula to calculate Greys and Sieverts.

Any detected alpha radiation in an air-born sweep or a swipe of a human body is the result of coming within a couple of centimetres of the source material. In the case of alpha EM radiation, the radioactive source material will be floating or passing, stuck to clothing, skin or hair in the form of particulate (sub-micron sized radioactive dust particles). Uranium and plutonium particulate has an affinity for clothing due to filter effects of the surface material, static charging and humidity of the body. The most radioactive secondary sources in Iraq were the clothing of troops in the battle field.

If the air-born particulate or fall-out is an alpha emitter it will be detected by the hand held detector provided it is close enough (an inch or so) and the rate of decay is frequent enough to emit an alpha decay within the immediate area of the detector's reading face (window) or the detector pauses long enough at that point if the source is stationary. Frequently the operator will scan too fast to catch the decays when the frequency is low or the distance is greater than a centimetre. Proximity/distance, frequency and density make the hand held detection a 3 dimensional task. The type of detector and the type of emission must be compatible as well.

No GM (Geiger Muller) counter can identify the type of radiation it is detecting. An alpha probe designed to ignore all other types of radiation is needed for alpha-only detection. That is what I used in Iraq and Afghanistan, where alpha decay is accompanied by gamma emissions.

No GM counter can identify the nuclide source. A nuclide identifier is required (about $15,000 for a basic field portable identifier). I used an Exploranium in Iraq. We used gamma and beta detectors to find the hot spots and original sources and then narrowed in with alpha probes.

The GM counters can only read EM pulses, not the "type" of radiation (i.e. it cannot specify that it is alpha). They are set to give an accumulated reading of decays and or translate (unreliably) into biological effectiveness.

The emissions of radioactivity from the Japanese supercritical reactor cores and the spent fuel cooling ponds that are causing a threat to the liquidators on site are two kinds: gamma and neutron radiation. Both are extremely "penetrating" and extremely damaging as they pass through the human body like a microscopic bullet, slicing and cutting cellular material, and super-heating sub-cellular molecular targets (just as if they are a miniature grenade exploding inside a cell).

The second type of radiation is the emissions from any air-born particles carried out the plant, lofting into the atmosphere and travelling across Japan -- these have now reached Canada and the US. These particles are entrained by the mechanical disturbances of the fire-fighters' water being poured on the reactors, the hydrogen explosions, etc. These air-born reactor fission products (man made products inside the nuclear reactor) such as radioactive Iodine and Cesium are mostly beta radiation emitters. They do not exist in nature and they are accompanied by a host of alpha radiation emitters from the original fuel: Depleted Uranium and Enriched Uranium and artificial nuclide, Plutonium. Beta, gamma and alpha radiation will be emitted by the contents of these air-born materials spread in the vapors, steams and smoke plumes leaving the plants and travelling around the globe.

A single particle of these air-born radiation emitters entering the lungs can enter the blood stream, incorporate in human tissue and start a biological chain reaction that can cause cancer and other systemic illnesses. To claim they are not a threat to human health is a fallacious statement. It is statement of statistics regarding the likelihood of exposure and consequent illness, and nothing to do with the biological effects of contamination. These radiations emitting materials (dusts and particles) are extremely dangerous when internalized. They should not be breathed into the body, ingested in food or water or allowed to be absorbed through the skin.

There is a cause for concern. As we have already said, it is more than likely (in fact quite certain) that Plutonium and Uranium are part of the fallout mix. If the gamma signal goes above background you have to assume there are particles floating about that you definitely do not want inside your body. The problem with alpha-emitting particles is that although the range of their radioactive decays is very short, they are immensely destructive, killing cells and potentially mutating the DNA of cells which survive. The standard ICRP model of radiation risk takes an average of the energy of those decays as if it were distributed across large volumes of tissue and concludes that the risk is low. This is as stupid as believing that because it's safe to warm yourself by the fire it's equally safe to absorb the same amount of heat by eating a red-hot ball bearing.

At the date of writing we still know of no information from Japan on alpha emitters from the disaster. This is a serious dereliction of duty to the public.

Main page: [link to www.llrc.org]
Above article: [link to www.llrc.org]
[link to www.llrc.org]

UPDATES FROM LLRC

20th March
The UK's Foreign and Commonwealth Office is trying to confuse our supporters by lying about what Geiger Counters can measure - claiming that contrary to what LLRC says some can measure alphas. It's nonsense. Take note of it only to note that the authorities want to "keep the public confused", as President Eisenhower demanded of his own officials in the 1950s (REF: [link to www.llrc.org]

Original advice (16th March 2011)
People are asking for advice on Geiger Counters. In this emergency anything is better than nothing. There are lots of Russian Geiger Counters on ebay. Before you ask, we don't have a list of recommended models. With hindsight we ought to have researched this but we didn't get round to it and now we haven't enough time.

You need one that will measure down to background levels. This means it needs to be able to display 0.05microSieverts or MicroGrays per hour. Background should be about .05 to 0.1 microSieverts per hour (0.005 milliRoentgens per hour up to 0.01 milliRoentgens per hour).

"Civil Defence" models distributed during the Cold War are unlikely to be any use. We have seen adverts for the CDV-715, for example, which has a range with the bottom end starting at 0.01 Roentgens per hour. Natural background radiation should be in the range 0.01 milliRoentgens per hour down to 0.005 milliRoentgens per hour (1 milliRoentgen being one thousandth of a Roentgen). In other words the CDV-715 is 1000 times too insensitive to pick up even the highest likely value of natural background.

Do not worry about calibration (see footnote).
Don't wait until you think the fallout might have arrived. Take readings outdoors immediately to establish the baseline value of what's normal for your area. Note down the readings. Ideally, email us and tell us where you are and what your baseline reading is.

Keep taking readings regularly - several times a day. Don't panic if there's a small increase when it rains - that's normal. Take avoiding action (see below) if the reading increases to double the baseline value and at that point please tell us.

NOTE: We have said Geiger Counters cannot measure or detect the presence of alpha emitters like Plutonium and Uranium or beta emitters like Tritium and Strontium 90. This remains true but it is very likely that those contaminants will arrive together with gamma emitters like Caesium 137. To put it another way, if the gamma signal increases, make the precautionary assumption that it's a flag for the whole cocktail of radionuclides from the reactor and from the spent fuel rods that have been blown into the air or burned. Take what action you can:-

stay indoors and keep doors and windows shut,
drink bottled water (even if it's only tap water that you drew off and stored before the fallout arrived),
use tinned milk, don't eat local produce unless it was harvested earlier.

Footnote on calibration:
Purists and pro-nuclear critics will bitch about calibration (i.e. standardizing your instrument against a known radiation source). You must not worry about it. This is about public protection, so accurate values are nowhere near as important as any variations you find measured on your monitor. So long as you keep using the same Geiger Counter you have a reliable way of spotting the changes.

[link to www.umrc.net]
[link to www.llrc.org]
Time for a new reality [link to www.thevenusproject.com]
Get A Kit, Make A Plan, Be Prepared. Zombie Apocalypses Do Happen!
"whoever forgets his history is condemned to repeat it"
“The Sun of Light shines in the Heart as Love.”
The Truth of Life descends from the world of Eternal Light {the sun} to illuminate the minds, regenerate the hearts, raise and renew the souls of all the sons of Truth destined to constitute the nucleus of the new humanity - Peter Deunov
"Knowledge is the Great Endowment of the Creator that lives within you and allows you to experience & express humanity’s One Spirituality, beyond all divisions of race, culture, nation & religion. Knowledge alone has the power both to guide and protect the individual and to unite and enable humanity to chart a new way forward"
Enchanted Wanderer (OP)

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03/27/2011 09:59 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
bump
Time for a new reality [link to www.thevenusproject.com]
Get A Kit, Make A Plan, Be Prepared. Zombie Apocalypses Do Happen!
"whoever forgets his history is condemned to repeat it"
“The Sun of Light shines in the Heart as Love.”
The Truth of Life descends from the world of Eternal Light {the sun} to illuminate the minds, regenerate the hearts, raise and renew the souls of all the sons of Truth destined to constitute the nucleus of the new humanity - Peter Deunov
"Knowledge is the Great Endowment of the Creator that lives within you and allows you to experience & express humanity’s One Spirituality, beyond all divisions of race, culture, nation & religion. Knowledge alone has the power both to guide and protect the individual and to unite and enable humanity to chart a new way forward"
Anonymous Coward
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03/27/2011 10:03 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
I read a report that they found 8 different radioactive materials. I wonder how other the geiger counter can't measure ?
What about Cesium-137 ? or I-131 ?
Anonymous Coward
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03/27/2011 10:05 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
The fancy ones the officials are using can't measure MOX either. That's why no one can tell us crapola.
Anonymous Coward
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03/27/2011 10:06 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
I don't know about the absolute uselessness of GM tubes in detecting plutonium. Plutonium alpha particles have an energy of ~5MeV and some of the pancake GM tubes claim detection down to 3MeV. A plutonium particle will produce a very distinctive count spike if it is swept with one of these tubes that will stand out from any other radiation sources. But the article is right about the distance problem. The tubes are fragile, although I don't know about the blade of grass. A stick for sure. Think clingwrap, but brittle.
Anonymous Coward
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03/27/2011 10:10 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
I don't know about the absolute uselessness of GM tubes in detecting plutonium. Plutonium alpha particles have an energy of ~5MeV and some of the pancake GM tubes claim detection down to 3MeV. A plutonium particle will produce a very distinctive count spike if it is swept with one of these tubes that will stand out from any other radiation sources. But the article is right about the distance problem. The tubes are fragile, although I don't know about the blade of grass. A stick for sure. Think clingwrap, but brittle.
 Quoting: Anonymous Coward 1305196


And says on a forum that the alpha particles lose 0.6 Mev/cm. So have to sweep close. But that is OK for sweeping clothing, or food. Just like in the Japanese footage - most likely they are sweeping for plutonium contamination using GM tubes.
Anonymous Coward
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03/27/2011 10:13 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
I don't know what your background is, but I worked for a while in the radiopharmaceutical business and from the little I know I must say that I have never read a more detailed report that as far as I can tell is 100% spot on. It is a real shame that the first useful information we receive on this issue is from a GLPer in Austrailia, and not the people we pay to look out for us, the damn Government.

Thank you for taking the time to help keep us better informed. God Bless.
Enchanted Wanderer (OP)

User ID: 1315646
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03/27/2011 10:13 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
bump
Time for a new reality [link to www.thevenusproject.com]
Get A Kit, Make A Plan, Be Prepared. Zombie Apocalypses Do Happen!
"whoever forgets his history is condemned to repeat it"
“The Sun of Light shines in the Heart as Love.”
The Truth of Life descends from the world of Eternal Light {the sun} to illuminate the minds, regenerate the hearts, raise and renew the souls of all the sons of Truth destined to constitute the nucleus of the new humanity - Peter Deunov
"Knowledge is the Great Endowment of the Creator that lives within you and allows you to experience & express humanity’s One Spirituality, beyond all divisions of race, culture, nation & religion. Knowledge alone has the power both to guide and protect the individual and to unite and enable humanity to chart a new way forward"
Enchanted Wanderer (OP)

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03/27/2011 10:18 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
I don't know what your background is, but I worked for a while in the radiopharmaceutical business and from the little I know I must say that I have never read a more detailed report that as far as I can tell is 100% spot on. It is a real shame that the first useful information we receive on this issue is from a GLPer in Austrailia, and not the people we pay to look out for us, the damn Government.

Thank you for taking the time to help keep us better informed. God Bless.
 Quoting: Black Knight


Thankyou for the cudos. however Im nothing special.. The guys on that site did all the work.. i am just a concerned resident of earth.. ive been searching all night for information on all levels that is not BS regarding this radiation..

Counters are offline all over the usa.. the japanese government is lying is freaking ass off.. its all just gone to shit and no one in any official capacity seems to be doing a damn thing about it..

why the hell isnt the usa or the un sending in the experts to take over from these incompentant fools in japan..

I watched a video where he said they didnt know why the water was contaminated.. WTF.. IF YOU DONT KNOW HOW THE HELL ARE YOU ALLOWED TO RUN A NUCLEAR FACILITY..

its all just too much .. i just hope this info helps people..
Time for a new reality [link to www.thevenusproject.com]
Get A Kit, Make A Plan, Be Prepared. Zombie Apocalypses Do Happen!
"whoever forgets his history is condemned to repeat it"
“The Sun of Light shines in the Heart as Love.”
The Truth of Life descends from the world of Eternal Light {the sun} to illuminate the minds, regenerate the hearts, raise and renew the souls of all the sons of Truth destined to constitute the nucleus of the new humanity - Peter Deunov
"Knowledge is the Great Endowment of the Creator that lives within you and allows you to experience & express humanity’s One Spirituality, beyond all divisions of race, culture, nation & religion. Knowledge alone has the power both to guide and protect the individual and to unite and enable humanity to chart a new way forward"
Anonymous Coward
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03/27/2011 10:30 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
Take note folks, the invisible threat can only be verified by government experts who have the right equipment! They will keep us informed via our media.
Although the counter you bought will show NO RADIATION (as if there were no threat at all above background level), you can rely on & trust your media to keep you informed & safe until the danger passes.

Thank God for the government scientists & media, or we'd all be fucked! Wouldn't' we.
Anonymous Coward
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United States
03/27/2011 10:32 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
Take note folks, the invisible threat can only be verified by government experts who have the right equipment! They will keep us informed via our media.
Although the counter you bought will show NO RADIATION (as if there were no threat at all above background level), you can rely on & trust your media to keep you informed & safe until the danger passes.

Thank God for the government scientists & media, or we'd all be fucked! Wouldn't' we.
 Quoting: Anonymous Coward 1316411


What a line of crap - who is this Prince Chuckie?
Enchanted Wanderer (OP)

User ID: 1315646
Australia
03/27/2011 10:32 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
bump
Time for a new reality [link to www.thevenusproject.com]
Get A Kit, Make A Plan, Be Prepared. Zombie Apocalypses Do Happen!
"whoever forgets his history is condemned to repeat it"
“The Sun of Light shines in the Heart as Love.”
The Truth of Life descends from the world of Eternal Light {the sun} to illuminate the minds, regenerate the hearts, raise and renew the souls of all the sons of Truth destined to constitute the nucleus of the new humanity - Peter Deunov
"Knowledge is the Great Endowment of the Creator that lives within you and allows you to experience & express humanity’s One Spirituality, beyond all divisions of race, culture, nation & religion. Knowledge alone has the power both to guide and protect the individual and to unite and enable humanity to chart a new way forward"
Anonymous Coward
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03/27/2011 10:33 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
I don't know what your background is, but I worked for a while in the radiopharmaceutical business and from the little I know I must say that I have never read a more detailed report that as far as I can tell is 100% spot on. It is a real shame that the first useful information we receive on this issue is from a GLPer in Austrailia, and not the people we pay to look out for us, the damn Government.

Thank you for taking the time to help keep us better informed. God Bless.
 Quoting: Black Knight


Thankyou for the cudos. however Im nothing special.. The guys on that site did all the work.. i am just a concerned resident of earth.. ive been searching all night for information on all levels that is not BS regarding this radiation..

Counters are offline all over the usa.. the japanese government is lying is freaking ass off.. its all just gone to shit and no one in any official capacity seems to be doing a damn thing about it..

why the hell isnt the usa or the un sending in the experts to take over from these incompentant fools in japan..

I watched a video where he said they didnt know why the water was contaminated.. WTF.. IF YOU DONT KNOW HOW THE HELL ARE YOU ALLOWED TO RUN A NUCLEAR FACILITY..

its all just too much .. i just hope this info helps people..
 Quoting: Enchanted Wanderer


Thanks, OP. I suspected as much that geiger counters would be limited in what they detect. So, we rely on our gov't which are composed of a bunch of cowardly, stinking liars to protect us -- we are doomed in all likelihood.
Enchanted Wanderer (OP)

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03/27/2011 10:35 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
Can we get a pin for this please.. its vital information..
Time for a new reality [link to www.thevenusproject.com]
Get A Kit, Make A Plan, Be Prepared. Zombie Apocalypses Do Happen!
"whoever forgets his history is condemned to repeat it"
“The Sun of Light shines in the Heart as Love.”
The Truth of Life descends from the world of Eternal Light {the sun} to illuminate the minds, regenerate the hearts, raise and renew the souls of all the sons of Truth destined to constitute the nucleus of the new humanity - Peter Deunov
"Knowledge is the Great Endowment of the Creator that lives within you and allows you to experience & express humanity’s One Spirituality, beyond all divisions of race, culture, nation & religion. Knowledge alone has the power both to guide and protect the individual and to unite and enable humanity to chart a new way forward"
Enchanted Wanderer (OP)

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Australia
03/27/2011 10:41 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
bump
Time for a new reality [link to www.thevenusproject.com]
Get A Kit, Make A Plan, Be Prepared. Zombie Apocalypses Do Happen!
"whoever forgets his history is condemned to repeat it"
“The Sun of Light shines in the Heart as Love.”
The Truth of Life descends from the world of Eternal Light {the sun} to illuminate the minds, regenerate the hearts, raise and renew the souls of all the sons of Truth destined to constitute the nucleus of the new humanity - Peter Deunov
"Knowledge is the Great Endowment of the Creator that lives within you and allows you to experience & express humanity’s One Spirituality, beyond all divisions of race, culture, nation & religion. Knowledge alone has the power both to guide and protect the individual and to unite and enable humanity to chart a new way forward"
Anonymous Coward
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03/27/2011 10:46 AM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
I don't know how accurate that all is. When I went to School the instructor brought a big lead container up in front of the class which contained Plutonium (the good stuff) and we turned our Geiger Counters on. Then when he raised the lid slightly the things would start clacking (I was in the back of the room Thank God because they don't warn you or give the opportunity to opt out, they just radiate your ass, and I bet that idiot instructor is dead by now, lol) and as the lid raises higher the counters would get louder. We went through numerous methods for detecting radiation from different sources. Unfortunately all the Schools I went were Highly Classified and I therefore can't provide anything I learned there based on source to validate what I am saying nor to repudiate any of the self appointed experts (reporters) coming up with all kinds of ignorant interpretations of information and not being able to differentiate old outdated data from current simply adds to their ignorance. They "think" they are smart and people who don't know better accept what they are saying but most of what we are getting from the media is idiocy based on ignorance,
Enchanted Wanderer (OP)

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03/27/2011 11:15 AM
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bump
Time for a new reality [link to www.thevenusproject.com]
Get A Kit, Make A Plan, Be Prepared. Zombie Apocalypses Do Happen!
"whoever forgets his history is condemned to repeat it"
“The Sun of Light shines in the Heart as Love.”
The Truth of Life descends from the world of Eternal Light {the sun} to illuminate the minds, regenerate the hearts, raise and renew the souls of all the sons of Truth destined to constitute the nucleus of the new humanity - Peter Deunov
"Knowledge is the Great Endowment of the Creator that lives within you and allows you to experience & express humanity’s One Spirituality, beyond all divisions of race, culture, nation & religion. Knowledge alone has the power both to guide and protect the individual and to unite and enable humanity to chart a new way forward"
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EW
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!


"Civil Defence" models distributed during the Cold War are unlikely to be any use. We have seen adverts for the CDV-715, for example, which has a range with the bottom end starting at 0.01 Roentgens per hour. Natural background radiation should be in the range 0.01 milliRoentgens per hour down to 0.005 milliRoentgens per hour (1 milliRoentgen being one thousandth of a Roentgen). In other words the CDV-715 is 1000 times too insensitive to pick up even the highest likely value of natural background.

The article is assuming that you don't need a CDV-715 ONLY because you are measuring NORMAL BACKGROUND LEVELS where you are and these won't register. If you are in a place like Los Angeles we are getting slammed with gamma from the FUK plants right now. If you can definitely pick up a CDV-715, you will see it for yourself!

I can assure you I have a CDV-715 and IT IS REGISTERING in Los Angeles. In fact right now it reads .8 roentgens per hour. A roentgen is equivalent in effect to a rad. NOT GOOD. But not surprising considering as more and more info comes out from TEPCO in dribs and drabs we are SLOWLY being alerted to the serious of the situation.

I agree and I have tried to tell people a regular geiger counter is useless in a situation like this. The only affordable detectors for these high levels of rad that the public can purchase is something like the CDV-715.
Anonymous Coward
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03/28/2011 08:56 PM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
a CDV 715 is a ion chamber radiation detector, for extremely high levels. It is useless for 99% of people.

the CDV 700 is a true beta/gamma geiger counter, made in the 1960s. Some models like the anton and lionel had small check source samples attacked to the frame of the unit, normally depleted uranium, to do a calibration and check on the instrument.

ebay sells many of these, of course now for a ridiculous price. I bought mine a few years back for 22 dollars, and it has been calibrated, and does work against various ore samples. I have a few samples of uranium/Americum 238..and it reads in the 2000,3000 cpm on most samples i have.


if you have the money, a digital Gamma scout, or CRM 100 is ideal. They detech alpha/beta/gamma/ and even xray
Anonymous Coward
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03/28/2011 09:08 PM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
a CDV 715 is a ion chamber radiation detector, for extremely high levels. It is useless for 99% of people.

the CDV 700 is a true beta/gamma geiger counter, made in the 1960s. Some models like the anton and lionel had small check source samples attacked to the frame of the unit, normally depleted uranium, to do a calibration and check on the instrument.

ebay sells many of these, of course now for a ridiculous price. I bought mine a few years back for 22 dollars, and it has been calibrated, and does work against various ore samples. I have a few samples of uranium/Americum 238..and it reads in the 2000,3000 cpm on most samples i have.


if you have the money, a digital Gamma scout, or CRM 100 is ideal. They detech alpha/beta/gamma/ and even xray
 Quoting: Anonymous Coward 1298853


Keep in mind the CDV-700 has limitations. The CD V-700 measures gamma radiation up to 50 milliroentgens per hour. So it maxes out at 50 MILLIREMS.

Here in Los Angeles I am currently reading 1 ROENTGEN per hour. If you are in Los Angeles or Oregon or Washington I recommend purchasing the CDV-715 unit also. Since they are both affordable it's a good idea to own both the
CDV-700 and 715.

I think you should have the option of knowing IF you are being exposed to very high levels without being told. The CDV-715 is the only affordable way to do that. But definitely get both, hopefully you are not in a high rad area.
nexuseditor

User ID: 1307878
Australia
03/28/2011 09:19 PM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
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"The nature of the universe is such that ends can never justify the means. On the contrary, the means always determine the end."
(Aldous Huxley)
Anonymous Coward
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United States
03/28/2011 09:29 PM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
Although the article raises some good points, you can detect some of the decay products of plutonium & uranium. See, they form what's called a decay chain, ultimately ending in lead, but with some nasty radioactive elements of various types in between. Many of those intermediary elements are beta & gamma emitters, which can be detected with a standard GM tube. Don't be fooled by half-lives measuring tens of thousands of years, etc. That's actually quite a lot of activity if the sample is large enough.
Anonymous Coward
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United States
05/14/2011 10:19 PM
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Re: THE TRUTH ABOUT GEIGER COUNTERS.. THEY DONT MEASURE PLUTONIUM & URANIUM RADIATION!!!!!!!
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great info thanks

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