Radiation intensity is expressed in different ways, depending on how it is being

Question

Radiation intensity is expressed in different ways, depending on how it is being measured. Mechanical measurements use becquerels (Bq) or curies (Ci). Energy absorbed by tissue is expressed in grays (Gy) or rads (rad). Tissue damage is expressed in sieverts (Sv) or rem. These units are related as follows: 1 Bq=1 disintegration/s (dps) 1 Ci=3.7×1010 Bq 1 rad=0.01 Gy, 1 Gy=1 J/(kg tissue) 1 rem=0.01 Sv, 1 Sv=1 J/kg

Part A If you purchased 1.31 Ci of sulfur-35, how many disintegrations per second does the sample undergo when it is brand new? Express your answer numerically in disintegrations per second.

Part B A 85.0-kg person is exposed to 489 rad of radiation. How many joules did this person absorb? Express your answer numerically in joules.

Explanation / Answer

A) 1.31 uCi in dps = 1.31 x 10^ -6 x 3.7 x 10^10 = 48470 dps   ( disintegrations per second)

B)   Rad = 0.01 x E in Joules/ Kg

given 489 rad and mass is 85 kg

hence 489 = 0.01 x E in Joules / 85

E in joules Joules = 4.1565 x 10^6 Joules

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