ARRT SAFETY MAIN SET ANSWERS AND QUESTIONS
SET A+
✔✔The allowable occupational radiation dosage that is assumed to result in an average
nominal lifetime risk is known as - ✔✔effective dose limit
✔✔effective dose limit for non-radiation worker - ✔✔5 mSv/year
✔✔effective dose limit for radiation worker to his/her body in a whole year - ✔✔50 mSv
✔✔percentage of primary exposure to patient that will reach a radiographer 1 meter
away - ✔✔.1%
✔✔personnel monitoring is performed if there is a possibility of exceeding how many
mSv per year? - ✔✔5 mSv
✔✔effective dose limit of fetus of pregnant RT - ✔✔.5 mSv/month
✔✔how often should personnel radiation monitoring devices be changed? - ✔✔monthly
✔✔the field positioning light and actual radiation field can't vary by more than what
percent of the SID - ✔✔+/-2%
✔✔the source to skin distance for stationary fluoro must not be less than how many
inches? - ✔✔15
✔✔source to skin distance for mobile radiography must not be less than how many
inches? - ✔✔12
✔✔which type of beam restricting device is considered best at reducing patient
exposure?
-cone
, -diaphragm
-collimator
-extension cylinder - ✔✔extension cylinder
✔✔source to skin distance in mobile fluoro must not be less than how many inches -
✔✔12
✔✔the quality of an xray beam can be measured by - ✔✔half value layer
✔✔a dose rate at the table top during fluoro cannot exceed ____ R per minute - ✔✔10
✔✔to prevent leakage radiation form exposing the patient, an x-ray tube must have how
much protective lead? - ✔✔1.5mm
✔✔a .5 mm gonadal shield will reduce female gonadal exposure by approx what
percentage? - ✔✔75%
✔✔how fast can dynamic flat-panel detectors, used in fluoro, capture and display an
image? - ✔✔30-50ms
✔✔the coulomb/kilogram unit applies to what type of radiation? - ✔✔X & gamma
✔✔measure of rate at which energy is transferred from radiation to soft tissue - ✔✔LET
✔✔transfer RNA carries which of the following of the polysome in order to synthesize
protein? - ✔✔amino acids
✔✔what measurement is equal to 1 joule per kilogram - ✔✔1 gray
✔✔if a human is exposed to radiation levels in the 100-200 R range, what is expected?
- ✔✔complete recovery in 90 days
✔✔which mature cell would be less sensitive to radiation? - ✔✔nerve cell
✔✔the "direct hit" theory of cell irradiation can be described how? - ✔✔DNA molecule is
struck
✔✔how is the coulomb per kilogram unit determined? - ✔✔ionization in air
✔✔what percentage of the total amount of radiation to the general public comes from
background radiation - ✔✔50%
✔✔most radiosensitive area of eye - ✔✔lens
SET A+
✔✔The allowable occupational radiation dosage that is assumed to result in an average
nominal lifetime risk is known as - ✔✔effective dose limit
✔✔effective dose limit for non-radiation worker - ✔✔5 mSv/year
✔✔effective dose limit for radiation worker to his/her body in a whole year - ✔✔50 mSv
✔✔percentage of primary exposure to patient that will reach a radiographer 1 meter
away - ✔✔.1%
✔✔personnel monitoring is performed if there is a possibility of exceeding how many
mSv per year? - ✔✔5 mSv
✔✔effective dose limit of fetus of pregnant RT - ✔✔.5 mSv/month
✔✔how often should personnel radiation monitoring devices be changed? - ✔✔monthly
✔✔the field positioning light and actual radiation field can't vary by more than what
percent of the SID - ✔✔+/-2%
✔✔the source to skin distance for stationary fluoro must not be less than how many
inches? - ✔✔15
✔✔source to skin distance for mobile radiography must not be less than how many
inches? - ✔✔12
✔✔which type of beam restricting device is considered best at reducing patient
exposure?
-cone
, -diaphragm
-collimator
-extension cylinder - ✔✔extension cylinder
✔✔source to skin distance in mobile fluoro must not be less than how many inches -
✔✔12
✔✔the quality of an xray beam can be measured by - ✔✔half value layer
✔✔a dose rate at the table top during fluoro cannot exceed ____ R per minute - ✔✔10
✔✔to prevent leakage radiation form exposing the patient, an x-ray tube must have how
much protective lead? - ✔✔1.5mm
✔✔a .5 mm gonadal shield will reduce female gonadal exposure by approx what
percentage? - ✔✔75%
✔✔how fast can dynamic flat-panel detectors, used in fluoro, capture and display an
image? - ✔✔30-50ms
✔✔the coulomb/kilogram unit applies to what type of radiation? - ✔✔X & gamma
✔✔measure of rate at which energy is transferred from radiation to soft tissue - ✔✔LET
✔✔transfer RNA carries which of the following of the polysome in order to synthesize
protein? - ✔✔amino acids
✔✔what measurement is equal to 1 joule per kilogram - ✔✔1 gray
✔✔if a human is exposed to radiation levels in the 100-200 R range, what is expected?
- ✔✔complete recovery in 90 days
✔✔which mature cell would be less sensitive to radiation? - ✔✔nerve cell
✔✔the "direct hit" theory of cell irradiation can be described how? - ✔✔DNA molecule is
struck
✔✔how is the coulomb per kilogram unit determined? - ✔✔ionization in air
✔✔what percentage of the total amount of radiation to the general public comes from
background radiation - ✔✔50%
✔✔most radiosensitive area of eye - ✔✔lens
