5. 0/14.28 points | Previous Answers ZinPhysLS3 24.P.011 My Notes Ask Your Teach

Question

5. 0/14.28 points | Previous Answers ZinPhysLS3 24.P.011 My Notes Ask Your Teacher Empirical results have revealed that for every unit of radiation dose (1 rad) there are 5 x 1011 inactivating events per cubic centimetre treated. If one were to administer a dose of 59 millirads, how many inactivating events per cubic centimetre would this dose produce? 0.295 (a) | % inactivating events per cubic Centimetre (b) The approximate volume of a cell is estimated to be 10-11 cm3. Calculate the fraction of the cells of the tissue treated by X-rays that will be hit if we allow only one event per cell? (Enter your answer as a percentage.) 20

Explanation / Answer

a)

59 millirads = 59 (10-3) rads = 59 (10-3) (5 x 1011) = 2.95 x 1010

b)

2.95 x 1010 x 10-11

0.295

so 29.5%

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