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Iodine-125
Of the thirty-seven known isotopes of iodine, only one occurs in nature, iodine-127. The others are radioactive and have half-lives too short to be primordia...
Thorium Source
Thorium source bought on ebay USA. The exact composition of radioisotopes in this sample is unknown, but could be reverse-engineered with this spectrum. It s...
Zeunerite
Zeunerite is a green copper uranium arsenate mineral with formula Cu(UO2)2(AsO4)2•(10-16)H2O. It is a member of the autunite group. The associated mineral me...