Practice #4 9-23 Flashcards
When counts can be seen on an instrument that are statistically different than background, is a definition for which of the following terms.
Minimum Detectable Activity
An air sample was taken during the removal of insulation from a main steam line leak in a BWR. The air sample was counted after the job was completed and
indicated 4 DACs of CO-60.
How much internal dose would the workers received if they breathed that concentration of activity for 1 hour and 15 minutes
duration of the job?
12.5 mrem
Typically the lower the background is on a counting instrument the more reliable the analysis. Which of the following is a method that can be used to reduce background on counting instruments.
A. Install lead shielding around the detector
B. Decontaminate the sample holder
C. Remove potential sources of radiation from the area
In thick shielding you have to account for scatter buildup which is due to the scattering of radiation in the absorber. True or False?
True
The last fission barrier before fission products can reach the public is which of the following.
Containment building
Which of the following elementary particles has the greatest mass?
Neutron
Based on 10CFR20 2000 DAC-Hours is equivalent to 5000 mrem of exposure. True or False?
True
Shallow Dose Equivalent, SDE, is a measure of which of the following?
Skin or an extremity
The time it takes for one half of the originally deposited radionuclide to be eliminated from the body through the body’s natural process is called biological half-life.
True
Which of the following factors listed below impact contamination being fixed or loose?
A. Porosity of contaminated surface
B. Physical form of the contaminant
The definition of cross-contamination is the spread of radioactive contamination into the air. True or False?
False
