Pure samples of telltale gas could help nuke sniffers

ULTRA-pure samples of a radioactive gas could soon make it harder for nations to carry out nuclear tests in secret. A global network of monitoring stations constantly samples the air for signs of underground nuclear tests. One thing the stations look for is the radioactive gas xenon-133. Nuclear explosions produce an excited form called xenon-133m, in which the atomic nucleus is boosted to a higher-energy state,
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