Qstnid -Ii-14-a Freshly Prepared Radioactive Source Of Half-life 2 H Emits Radiation Of Intensity Which Is 64 Times The Permissible Safe Level. The Minimum Time After Which It Would Be Possible To Work Safely With This Source Is - 46: The Nucleus - Neet-xii-physics

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NEET-XII-Physics

46: The Nucleus

with Solutions - page 3

Qstn# ii-14 Prvs-Qstn Next-Qstn

#14
A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is
(a) 6 h
(b) 12 h
(c) 24 h
(d) 128 h.
digAnsr: b
Ans : (b) 12 h
A freshly prepared radioactive source emits radiation of intensity that is 64 times the permissible level. This means that it is possible to work safely till 6 half-lives (as 2⁶ = 64) of the radioactive source. Since the half-life of the source is 2h, the minimum time after which it would be possible to work safely with this source is 12 h.
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