Practice #5 22-31

Question 1

The weighting factor for the EDEX for the upper arm is which of the following

Answer 1

.005

Question 2

Which of the following is the best definition for Derived Air Concentration, DAC?

Answer 2

Concentration of a radionuclide in air, which if breathed for 2000 hours, would result in an intake of one ALI, or 5 rem.

Question 3

If a worker breathed air containing a concentration of 1 DAC of 1-131 and 2 DACs of Cs-137, how much dose would they receive if they spent 1.5 hours at the job site?

Answer 3

11.25 mrem

Question 4

Which of the following statements best defines a Rad (radiation absorbed dose)?

Answer 4

The amount of energy from ionizing radiation in air that is equal to 100 ergs of energy being deposited.

Question 5

The DAC value listed for each radionuclide in 10CFR20, Appendix B, Table 1,
Column 1, is designed so that is a person breathed that concentration for 2000
hours during the course of a year, they would receive how much exposure?

Answer 5

1 DAC hour

Question 6

A general area dose rate is measured at what distance from the radiation source?

Answer 6

30 cm away

Question 7

Which of the following statements best describes effective half-life?

Answer 7

The amount of time it takes for the amount of radioactive material to decrease by half.

Question 8

The Relative Biological Effectiveness, RBE, for alpha is higher due to the high
linear energy transfer (LET) of an alpha particle with matter. What is the RBE for
alpha particles from the list below?

Answer 8

20

Question 9

Which of the following isotopes is a noble gas that is result of the fission process in nuclear power plants?

Answer 9

Xenon

Question 10

Rem is used to measure dose equivalent, or effective dose. For which two types of ionizing radiation is the dose equivalent the same as the absorbed dose for using the Rem as a measurement?

Answer 10

Beta and gamma