67. The decay rate Ris related to the number of nuclei Nby R = λN, where λis the disintegration constant. The disintegration constant is related to the half-life 1/2Tby ln 2ln 2RTRNTλ=⇒==. Since 1 Ci = 3.7 ×1010disintegrations/s, N=××=×−25037 102 78 64 102311 10101418
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