ProblemSet_3-1

ProblemSet_3-1 - 22:01 Introduction to Ionizing Radiation...

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22:01 Introduction to Ionizing Radiation Problem Set 3 Date Due: Tuesday, 6 October 2009 1. Calculate (i) the number of grams and (ii) the number of radioactive nuclei in 1 mCi of (a) 32 P (b) 226 Ra (c) 40 K. 2. The activity of a radioisotope is found to decrease by 70 % in 3 months. What are the values of its (a) decay constant, (b) half-life, and (c) mean life. 3. The element iodine collects in the thyroid gland. Iodine radionuclides are therefore often used medicinally either for therapeutic or diagnostic purposes. If 3.7 x 10 7 Bq of the beta minus emitter 130 I (half-life 12.6 hr; maximum beta energy 0.87 MeV) are present in the thyroid, estimate the total energy deposited in the thyroid in a 24 hr period. Express your answer in both ergs and Joules and assume all betas emitted from the Iodine deposit all their energy in the thyroid gland. Clearly state any assumptions you make. 4. A 10.0 mg sample of 238 U emits 7380 alpha particles per minute. This sample shows the same activity, 7380 alpha particles per minute, even after many years have
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This note was uploaded on 03/09/2010 for the course 22 22.01 taught by Professor Smith during the Fall '09 term at MIT.

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ProblemSet_3-1 - 22:01 Introduction to Ionizing Radiation...

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