A Radioactive Source of ¹³⁷Cs (T_1/2= 30 Y) Was Calibrated $\mu$

question 28

Multiple Choice

A radioactive source of ¹³⁷Cs (t_1/2= 30 y) was calibrated on October 23, 2000, to contain 10 $\mu$ Ci.This is used as a daily accuracy check source in the dose calibrator.Presuming the dose calibrator is working properly, what activity should the dose calibrator show on April 23, 2006?

• A)9.6 \(\mu\)Ci
• B)8.8 \(\mu\)Ci
• C)5.4 \(\mu\)Ci
• D)2.2 \(\mu\)Ci

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