1. The maximum permissible workday dose for occupational exposure to radiation i

Question

1. The maximum permissible workday dose for occupational exposure to radiation is 11 mrem. A 77 kg laboratory tech absorbs 2.3 mJ of 0.5 MeV gamma rays in a work day. The relative biological effeciency for gamma rays is 1.00. What is the approximate number of gamma-ray photons absorbed by the tech in a workday?

a) 1*10^8

b) 3*10^8

c) 1*10^9

d) 3*10^9

e) 3*10^10

2. A radioactive source of a single nuclide emits 2.4 MeV neutrons at the rate of 7100 neutrons per second. The number of atoms in the source is 2.6*10^9. The activity of the source, in nCi, is closest to which of the following values?

a) 71

b) 1900

c) 190

d) 710

e) 19

3. The decay constant of a radioactive nuclide is 3.1*10^-3 s^-1. At a given instant, the activity of a specimen of the nuclide is 70 mCi. After what interval of time interval will the activity decline to 10 mCi?

a) 750 s

b) 820 s

c) 880 s

d) 630 s

e) 690 s

4. A radioactive nuclide of atomic number Z emits an electron, and then the daughter nuclide emits a gamma ray. What is the atomic number of the resulting nuclide after both processes?

a) Z-3

b) Z-1

c) Z+1

d) Z-2

Explanation / Answer

1)d

2)b

3)d

4)a

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