When exposed to a radioactive source which emits 1.2-mev gamma-rays, a particular material is found to have a half-value thickness x of 10 cm how thick would a shield made of this material need to be in order to block 75% of the radiation? a. 5 cm b. 20 cm c. 15 cm d. 25 cm e. 10 cm

E

Explanation:

It is given that Energy of gamma ray is E=1.2 Mev

Shielding effect can be measured by measuring the fraction of gamma rays blocked by shield. If certain thickness will able to block half the radiation then to block 75% radiation we need to add same amount of thickness in order to block the remaining radiation.

i.e. fraction is blocked by 10 cm thickness

then remaining radiation is

another 10 cm thickness will block the remaining half radiation i.e.

so total 75 % radiation will be blocked

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