Radiological Measurements.

What is the unit used to express the amount of ionization in air from only gamma radiation?

Roentgen (R)

What is the unit used to express the amount of radiation dose based on biological effect?

Rem

What is the unit used to express the amount of absorbed dose in any material?

Rad

How many disintegrations per minute are in a Curie of radioactivity? Enter the answer using scientific notation.

______ dpm

Enter your answer in the following format:

X.XX E±XX

2.22 E+12 dpm

How many disintegrations per minute are in a microcurie of radioactivity? Enter the answer using scientific notation.

______ dpm

Enter your answer in the following format:

X.XX E±XX

2.22 E+06 dpm

What is the dose equivalent to a tissue that received an absorbed dose of 0.5 rad from fast neutron radiation? The Quality Factor for fast neutrons is 10.

______ Rem

5 Rem

What is the tissue depth for measuring Deep Dose Equivalent?

______ mg/cm²

1,000 mg/cm²

What is the tissue depth for measuring Shallow Dose Equivalent?

______ mg/cm²

7 mg/cm²

What is the tissue depth for measuring Lens Dose Equivalent?

______ mg/cm²

300 mg/cm²

What is the term used to express the dose to a specific organ from an intake of radioactivity?

Committed Dose Equivalent (CDE)

What is the term that is calculated by summing the products of the weighing factors applicable to each body compartment and the dose equivalent to those body compartments?

Effective Dose Equivalent (EDE or EDEX)

What is the term that is calculated by summing the products of the weighing factors applicable to each organ and the committed dose equivalent to those organs?

Committed Effective Dose Equivalent (CEDE)

What is the term that expresses the overall risk from stochastic effects from both external and internal exposure to radiation and radioactive materials?

Total Effective Dose Equivalent (TEDE)

What is the term that expresses the total dose to a specific organ from both external and internal exposure to radiation and radioactive materials?

Total Organ Dose Equivalent (TODE)

What is the annual regulatory limit for dose to the lens of the eye?

______ rem/year

15 rem/year

What is the annual regulatory limit for Shallow Dose Equivalent?

______ rem/year

50 rem/year

What is the annual regulatory limit for Total Effective Dose Equivalent?

______ rem/year

5 rem/year

Check the statements below that provide the basis for regulatory limits.

• The Total Organ Dose Equivalent limit is based on minimizing the potential for stochastic effects.

• The Lens Dose Equivalent limit is based on preventing non-stochastic effects.

• The Shallow Dose Equivalent limit of 50 rem/year prevents skin cancer.

• The Total Effective Dose Equivalent limit is based on minimizing the potential for stochastic effects.

• The Lens Dose Equivalent limit is based on preventing non-stochastic effects.

• The Total Effective Dose Equivalent limit is based on minimizing the potential for stochastic effects.

Check the dosimeters below that are normally used as a Dosimeter of Legal Record.

• OSL

• Electronic Dosimeter

• Pocket Ion Chamber

• TLD

• SRD

• OSL

• TLD

What is the acronym for the DLR that emits blue light when the crystal is exposed to green light?

OSL or OSLD

What is the acronym for the DLR that emits light when the crystal is heated?

TLD

What is the Quality Factor for alpha radiation?

20

What is the term for the time required for one-half of an intake to be eliminated from the body due to the combined effects of radioactive decay and natural body elimination processes?

______ Half-Life

Effective Half-Life

Which one of the following requires the least amount of time?

• Effective Half-Life

• Radiological Half-Life

• Biological Half-Life

Effective Half-Life

Check the statements below that are true with regard to the Annual Limit on Intake (ALI).

• ALI values are site-specific and listed in site procedures.

• An intake below one ALI ensures CEDE does not exceed 5 rem.

• An exposure of 1,000 DAC-Hrs will result in an intake of one ALI.

• ALI values are based on solubility class.

• An intake below one ALI ensures the CDE to any organ does not exceed 50 rem.

• An intake below one ALI ensures CEDE does not exceed 5 rem.

• ALI values are based on solubility class.

• An intake below one ALI ensures the CDE to any organ does not exceed 50 rem.

What is a worker’s CEDE from cleaning the internals of a valve without respiratory protection for 1.5 hours? The work area air sample results were 3.5 E-8 uCi/ml of C0-60. The Co-60 DAC is 1.0 E-8 uCi/ml.

______ mrem

Between 12.99 and 13.13

What is the dose rate 2.5 feet from a 3 Curie source of Co-60? Co-60 remits a 1.17 MeV and a 1.33 MeV gamma 100% of the time.

______ R/hr

Between 7.18 and 7.22

What is the dose rate 4.5 feet from a 200 mCi source of Cs-137? Cs-137 emits a 0.66 MeV gamma 86% of the time.

______ mR/hr

Between 33.5 and 33.7