ARRT Level 1 Module 6 JKO
A worker group has a total exposure limit of 5 mR. The group must perform work in a
radiation area at a 2 meter distance from a 5 curie point source emitting a single 0.662
MeV gamma ray with an abundance of 85%. What is the stay time of the workers? -
ANS-0.8 minutes
The process by which a radioactive nuclide has a distinctive decay rate which is not
influenced by any physical process including biological functions is called what? -
ANS-Radioactive decay
What is the appropriate preventative measure to take if a exposure exceeds 40
DAC-hours in any year? - ANS-Wear respiratory protection
What is the quantity measurement obtained by dividing the annual limit for any given
radionuclide by the volume of air breathed by an average worker during a working year
and has a unit of activity per volume? - ANS-Derived air concentration
What is the quantity measurement of a single radionuclide which, if inhaled or ingested
in one year, would irritate a person, represented by reference man to the limiting value
for control of the workplace and has a unit in activity? - ANS-Annual limit on intake
What is the term used to describe the compounds that increase in natural turnover
process thus releasing some forms of radioisotopes from body tissues? -
ANS-Mobilizing agents
What is the term used to describe the compounds which act on insoluble compounds to
form a soluble complex ion which can then be removed through the kidneys? -
ANS-Chelating agents
What term describes when the time allowed in a radiation field is calculated to prevent a
worker from exceeding an allowable does equivalent? - ANS-Stay time
When working with point sources increasing the distance from the source is more
effective in reducing exposure rates than decreasing the time spent in the radiation field.
- ANS-True
Which formula is used to determine the gamma radiation field intensity in R/hr at one
meter from a radioactive point source? - ANS-0.5 CEN
A worker group has a total exposure limit of 5 mR. The group must perform work in a
radiation area at a 2 meter distance from a 5 curie point source emitting a single 0.662
MeV gamma ray with an abundance of 85%. What is the stay time of the workers? -
ANS-0.8 minutes
The process by which a radioactive nuclide has a distinctive decay rate which is not
influenced by any physical process including biological functions is called what? -
ANS-Radioactive decay
What is the appropriate preventative measure to take if a exposure exceeds 40
DAC-hours in any year? - ANS-Wear respiratory protection
What is the quantity measurement obtained by dividing the annual limit for any given
radionuclide by the volume of air breathed by an average worker during a working year
and has a unit of activity per volume? - ANS-Derived air concentration
What is the quantity measurement of a single radionuclide which, if inhaled or ingested
in one year, would irritate a person, represented by reference man to the limiting value
for control of the workplace and has a unit in activity? - ANS-Annual limit on intake
What is the term used to describe the compounds that increase in natural turnover
process thus releasing some forms of radioisotopes from body tissues? -
ANS-Mobilizing agents
What is the term used to describe the compounds which act on insoluble compounds to
form a soluble complex ion which can then be removed through the kidneys? -
ANS-Chelating agents
What term describes when the time allowed in a radiation field is calculated to prevent a
worker from exceeding an allowable does equivalent? - ANS-Stay time
When working with point sources increasing the distance from the source is more
effective in reducing exposure rates than decreasing the time spent in the radiation field.
- ANS-True
Which formula is used to determine the gamma radiation field intensity in R/hr at one
meter from a radioactive point source? - ANS-0.5 CEN
