± Study of Plutonium Levels in a Human Population 411 02 dps Hints My Answers Gi

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± Study of Plutonium Levels in a Human Population 411 02 dps Hints My Answers Give Up Revlew Pat Radation can be measured according to activity, exposure, or its effect on biological tissue. Units of curies Ci) and disintegrations per second (dps) measure Correct The actihity of a radiation source can also be expressed using the Si unit of a becquerel (Bq), where Thus, 4.11 × 10-dps = 4.11x 10-2Bq. activity. The rad measures exposure, where rad stands for radlation absorbed dose. The rem measures biological effect, where rem stands for roentgen equivaient man RBE is a mutiplication factor known as relative biologica effecfiveness and is approximately 1 for beta and gamma radation and 10 for alpha radation The foilowing conversion factors relate these quantities Part B 1 Ci 1 rad 3.7 × 1010 dps 1 10-i J/kg tissue A 75-kg person is exposed to nis radation for 1,00 year (365 days), If each alpha particle deposits 8.00x 10-13J what is the numbe rads absorbed by the person? Express your answer in rads using two significant figures. = number of rms(RBE)(number of rads) Note that he conversion factors between curies and disintegrations per second and between rads and joules klogren of issue exact (ie. they contan an ininite number of significant fgures). The RBE, however, s approximate and has only one significant figure because vases were dose rate, total d affected. and type of tissue rad Hints My Answers Give Ue Review Part Incorrect; Try Again Part C

Explanation / Answer

Part B - The number of rads absorbed by the person = 8 x 10^-13 x 365/75 x 1 x 10^-2 = 3.89 x 10^-10 rads

Part C - mass defect = (10.0129 + 1.0086) - (7.0160 + 4.0026) = 0.0029 amu

amount of energy released = 0.0029 x 931 = 2.699 MeV

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