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if a woman has been given a dose of 10 mCi(millicurie, a measurement of radition) how...

if a woman has been given a dose of 10 mCi(millicurie, a measurement of radition) how much 131 I will be on her system when she can safely get pregnant? ( approx 6 months)
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Answer #1

THE WOMEN PATIENT UNDERGOING I131 TREATMENT PHYSICIANS RECOMMEND THAT PREGNANCY BE DELAYED UNTIL AT LEAST 6 MONTHS TO 12 MONTHS AFTER TREATMENT.

THE AMOUNT OF IODINE -131 THAT REMAINS UNDECAYED , (A) , AFTER A PERIOD OF TIME (T),

WILL BE EQUAL TO =       A = A0* 1/2N

(N) REPRESENTS NUMBER OF HALF LIVES THAT PASS IN (T)

ONE MILLICURIE = 1000 MICROCURIE

200 MICROCURIE = APPROXIMATELY ONE GRAM

THAT IS 1000 MICRO CURIE = 5 GRAMS

10 MILICURIE = 50 GRAMS

N = NUMBER OF DAYS / HALF LIFE PERIOD ( HALF LIFE OF IODINE= 8 DAYS)

= 180/ 8 = 22.5

N = 22.5

I131  REMAINS IN BODY AFTER 6 MONTHS = A = A0 * 1/2N

   = 50* 1/222

   =     50 * 0.0002384358

= 0.0119217930376 gms

i131 REMAINS IN THE BODY AFTER 6 MONTHS WHEN SHE CAN SAFELY GET PREGNANT

   = 0.0119217930376 gms approximately

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