a)If a pregnant woman should be exposed to no more than 20 rad, and a radiation

Question

a)If a pregnant woman should be exposed to no more than 20 rad, and a radiation source gives 51 rad at 534cm, what is the minimum distance she should stand from the radiation source?___cm

b)What is the activity of a 53.9uCi sample of carbon-14 in becqueeir?__Bq

c) Balance the following nuclear equation by giving the mass number, atomic number, and element symbol for the missing species.

^27Al + ^4He --> ?/? ? + 1/0n

d) If a buffer solution is 0.480 M in a weak acid (Ka=6.6x10^-6) and 0.260M in its conjugate base, What is the pH?

Explanation / Answer

a > The dose rate follows the inverse square law.
Let distance be x cm.
Thus, x2 = 51 * 5342 / 20

x = 853 cm

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