(show all your works and please do all questions from part a to part c. Sorry fo

Question

(show all your works and please do all questions from part a to part c. Sorry for long questions, but I will give thanks to anyone who can help me all questions from part a to part c)

a. plutonium-239 (t1/2= 2.41*104yr) represents a serious nuclear waste hazard. if it takes seven half-lives to reach a tolerable level of radioactivity, how long must 239Pu be stored

b. radiation danger depends on what three factors

c. what is the relative external penetrating power of alpha, beta, and gamma "rays"

Explanation / Answer

a) Time taken = 7 * t(1/2)

=> 7 * 2.41 * 10^4 years

=> 1.687 * 10^5 years

b)

The three factors are

1) Type of Radiation

2) Our exposure to radiation, i.e. how much time we are working in that radiation environment

3) Our body capability to resist the radiation

c) Penetrating power order will be

gamma < alpha < beta

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