Japan detects xenon in air after N Korean nuclear test

TOKYO — Japanese planes detected a trace amount of xenon-133 during monitoring flights over Japan the day after North Korea carried out its third nuclear test last week, the science ministry said Thursday.

The radioactive material amounting to 1.9 millibecquerels per cubic meter of air was detected from samples collected at an altitude of 300 meters off the coast of Aichi Prefecture in central Japan, Jiji Press reported.

It was the first time Japan had detected xenon-133 since it strengthened radiation monitoring in response to the test on Feb 12, the news agency said.
[link to www.japantoday.com]
.