Hiroshima and Nagasaki still radioactive?

Very interesting facts from the Japanese Radioactive radiation research foundation; how come we never heard of these???? For all that we learned in school these places has been "dead zones" since the A bombs sixtysomething years ago, and will remain so hundreds or thousands of years.

"Are Hiroshima and Nagasaki still radioactive?

The practical answer is, "No."

Doses from residual radioactivity in both cities are now far below the annual background dose (0.001-0.003 Sv); hence, there are no detectable effects on human health. Radioactivity was over 90% gone by one week after the bombings and was less than the background level by one year.

People often ask, "If uranium and plutonium pose a potential hazard in nuclear waste sites and were present at dangerous levels in the environment following the Chernobyl nuclear accident, why aren't Hiroshima and Nagasaki still uninhabitable?"

There are two ways residual radioactivity is produced from an atomic blast. The first is due to fallout of the fission products or the nuclear material itself--uranium or plutonium (uranium was used for the Hiroshima bomb whereas plutonium was used for the Nagasaki bomb)--that contaminate the ground. Similar ground contamination occurred as a consequence of the Chernobyl accident, but on a much larger scale (click here for more-detailed explanation). The second way residual radioactivity is produced is by neutron irradiation of soil or buildings (neutron activation), causing non-radioactive materials to become radioactive."

Read more: [link to www.rerf.or.jp]