Increased concentration of beryllium-7 in the stratosphere after the nuclear test explosions during September-October 1961.
D001608:Beryllium; D005107:Explosions; D011847:Radioactive Fallout; D011851:Radioactivity; D011868:Radioisotopes
D011847:Radioactive Fallout; D011868:Radioisotopes; D001608:Beryllium
BERYLLIUM/radioactive; RADIOACTIVE FALLOUT