FUN 1 EO: 1.42 - Radiation Protection Tech.

FUN 1 EO: 1.42

1 / 10

Under what conditions may licensees disregard certain radionuclides in a mixture?

If the concentration of any radionuclide disregarded is less than 10% of its DAC, and the sum of these percentages does not exceed 30%

If the sum of the percentages for all the radionuclides in the mixture is exactly 30%

If the concentration of each radionuclide is exactly 10% of its DAC

If the concentration of any radionuclide disregarded is more than 30% of its DAC

2 / 10

What does DAC relate to in terms of modes of exposure?

Only the external dose from radiation sources

Only the internal dose equivalents from ingesting radionuclides

Only external submersion in a radioactive environment

Either external submersion or the internal committed dose equivalents [CDE]

3 / 10

For non-stochastic ALIs and DACs, what is the equivalent in mrem of 1 DAC-hr?

25 mrem

50 mrem

2.5 mrem

5 mrem

4 / 10

When calculating DAC hours for exposure, what does 1 DAC-hr equal in mrem for stochastic ALIs and DACs?

2.5 mrem

25 mrem

50 mrem

5 mrem

5 / 10

What is the simplified formula to calculate DAC from ALI?

DAC = ALI / 2400 m^3

DAC = ALI / 2.4 x 10^9 μCi/ml

DAC = ALI x 2000 hours

DAC = ALI x 2.4 x 10^9 μCi/ml

6 / 10

What is Derived Air Concentration (DAC) as defined in Appendix B of 10 CFR 20?

The airborne concentration that equals the ALI divided by the volume of air breathed by an average worker for a working year of 2000 hours

The total amount of radionuclides inhaled by an average worker

The volume of air inhaled by a worker in one year

The maximum allowable concentration of radionuclides in the workplace

7 / 10

How is the relationship between DAC and ALI given?

DAC = ALI/(2000 hours per working year x 60 minutes/hour x 2 x 10^4 ml per minute)

DAC = ALI/1040 hours per working year

DAC = ALI x 2400m^3

DAC = ALI x 2000 hours per year

8 / 10

How are DAC hours calculated for a specific radionuclide like Cobalt-60?

Using the value for Inhalation DAC and multiplying by exposure time in hours

Dividing the DAC by the exposure time in hours

Dividing the ALI by the exposure time in hours

Using the value for ALI and multiplying by exposure time in hours

9 / 10

Where can 10CFR20 Appendix B be located?

On the Nuclear Regulatory Commission (NRC) website

In the Federal Register of the U.S.

In the EPA’s published guidance

In the Occupational Safety Handbook

10 / 10

What would be the DAC for a mixture if the identity of each radionuclide in the mixture is known, but the concentration of one or more of the radionuclides in the mixture is not known?

The DAC of the longest-lived radionuclide in the mixture

The sum of the DAC values for each known radionuclide

The average of the DAC values for each known radionuclide

The most restrictive DAC of any radionuclide in the mixture

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