Radiology General 574515d5 At t = 0 there are 6 x 1023 radioactive atoms of a substance, which decay with a disintegration constant (A,) equal to 0.01/sec. What would be the initial decay rate? A 6 x 1023 B 6 x 1022 C 6 x 1021 D 6 x 1021 High-Yield Explanation Ans. 6 x 1021