![]() ![]() How long will it take for 30 g of 222Rn to decay to 7.5 g?ġ4 Cards in this Set Compared to the mass and the penetrating power of an alpha particle, a beta particle has And after TWO half-lives, a HALF + HALF of a HALF, i.e. What is the state of a radioactive sample after 2 half-lives have passed?Īfter 1 half life, clearly HALF of the original isotope remains.
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