Over a year\'s time, a person receives a biologically equivalent dose of 24 mrem

Question

Over a year's time, a person receives a biologically equivalent dose of 24 mrem (millirems) from cosmic rays, which consist primarily of high-energy protons bombarding earth's atmosphere from space. The relative biological effectiveness of protons is 10.

 

(a) What is the person's absorbed dose in rads? (b)The parson absorbs 2.95 x 10^-3 J of energy from cosmic rays in a year. What is the person's mass? Over a year's time, a person receives a biologically equivalent dose of 24 mrem (millirems) from cosmic rays, which consist primarily of high-energy protons bombarding earth's atmosphere from space. The relative biological effectiveness of protons is 10.

Explanation / Answer

a) rems are the product of rads and biological effectiveness (10). so
24mrems/10 =2.4mrads ( = 0.0024 rads)

b)use Grays to calculate as folows:
1rad=0,01grays... and 1 gray means 1J(of ionizing ray)/1kg in person.
so 2.4mrads= 0,024mGy...
and 0.024mGy=(2.95x10^-3) /x ) and calculate the x ( divide energy with grays)
=122.917 kg ( little overweight but plausible)

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