Suppose a patient is given 145 mg of I- 131, a beta emitter with a half-life of

Question

Suppose a patient is given 145 mg of I- 131, a beta emitter with a half-life of 8.0 days. Assuming that none of the I-131nis eliminated from the person's body in the first 4.0 hours of treatment, what is the exposure (in Ci) during those first four hours? Suppose a patient is given 145 mg of I- 131, a beta emitter with a half-life of 8.0 days. Assuming that none of the I-131nis eliminated from the person's body in the first 4.0 hours of treatment, what is the exposure (in Ci) during those first four hours?

Explanation / Answer

k = 0.693 /t 0.5

= 0.693 /8 * 1/24 /1/3600

= 1*10^-6 s-1

atoms

= 145 *1/131 *6*10^23/1mol =6.660645161290323 *10^14 diintegrations/sec

activity

=6.66*10^14    *   1Ci/ 3.7*10^10

=1.800174367916303 *10^4 Ci

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