GK
NUCLEAR SCIENCE
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Beta
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Gamma
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Alpha
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None of the above
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Detailed explanation-1: -Gamma rays are the most harmful external hazard. Beta particles can partially penetrate skin, causing “beta burns”. Alpha particles cannot penetrate intact skin. Gamma and x-rays can pass through a person damaging cells in their path.
Detailed explanation-2: -The individual dose limit for radiation workers averaged over 5 years is 100 mSv, and for members of the general public, is 1 mSv per year.
Detailed explanation-3: -From least to most penetrating, they are alpha < beta < neutron < gamma.
Detailed explanation-4: -Adult: 5, 000 Millirems. The current federal occupational limit of exposure per year for an adult (the limit for a worker using radiation) is “as low as reasonably achievable; however, not to exceed 5, 000 millirems” above the 300+ millirems of natural sources of radiation and any medical radiation.