Question

9. (6 points) The strontium isotope Sr-90 specimen used in our laboratory experiments is a beta emitter with a half-life of 28.8 yr. Each decay event releases about 2.874 MeV (assume the energy is delivered entirely from beta). If the specimen source has a rated activity of 3700 Bq, find: a. the power of the source in watts. b. the absorbed dose if you surrounded the source with your closed fist (assume 0.50 kg hand mass) for 1.0 hr. Include the correct units. C. the equivalent dose to your hand if the RBE factor = 1.0 for beta radiation. Include the correct units.

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Answer 1

The answer for above problem is explained below.

Power (P) = (:: leva 106 x1ö9 ] Energy time P = 3700 Bq x 2.874 x 106 x 1.6x169 w 1 sec P = 1.701 x 10 9 W Absorbed dose =

- Pxt m 16701 x 10 9 W x 60 x 60 sec 0.5kg 1.225 x 10 5 Gray equivalent dose = Absorbed dose X RBE = (1.225x165 x 1) Sievert = 11. 225 x105) Sievert