ARRT SAFETY REVIEW
Which cell types have the lowest radiosensitivity:
nerve cells
muscle cells
spermatids
lymphocytes - answer nerve cells (except in fetal life, they are highly radiosensitive)
Which cells are the most radiosensitive in the body - answer lymphocytes
Which interaction between x-ray photons and matter involves a high energy photon and
the ejection of an outer shell electron?
photoelectric effect
coherent scatter
Compton scatter
pair production - answer Compton scatter
What is likely to occur if 250 mGy is accidentally delivered to a recently fertilized ovum?
Skeletal anomalies
CNS anomalies
Spontaneous abortion
Childhood malignancy - answer spontaneous abortion
Primary radiation barriers include: - answer walls, doors, floors
secondary radiation barriers include - answer lead aprons, lead gloves, thyroid shields,
ceiling
In which of the following examinations would an IR front having very low absorption
properties be especially important?
Abdominal radiography
Extremity radiography
Angiography
Mammography - answermammography
The most radiosensitive portion of the GI tract is - answersmall bowel
Which of the following has (have) an effect on the amount and type of radiation-induced
tissue damage?
Quality of radiation
Type of tissue being irradiated
, Fractionation
a. 1 only
b. 1 and 2
c. 1 and 3
d. all 3 - answerall 3
How is the intensity of an x-ray photon affected after each time it scatters?
Its intensity increases 4 times.
Its intensity increases 1000 times.
Its intensity decreases 4 times.
Its intensity decreases 1000 times. - answerits intensity decreases 1000 times
breaks the DNA molecule into two or more pieces. - answermain-chain scission
incorrect joining of broken DNA fragments. - answercross-linking
the disruption of a single chemical bond as a result of irradiation. - answerpoint lesion
Irradiation of macromolecules in vitro can result in
main-chain scission
cross-linking
point lesions
a. 1 only
b. 1 and 2
c. 2 and 3
d. all 3 - answerall 3
The National Council on Radiation Protection and Measurements (NCRP) recommends
an annual occupational effective (stochastic) dose equivalent limit of
1 mSv.
5 mSv.
15 mSv.
50 mSv. - answer50 mSv
What is the established fetal dose-limit guideline for pregnant radiographers during the
entire gestation period?
1.0 mSv
5.0 mSv
50 mSv
100 mSv - answer5 mSv
Which of the following is (are) used to account for the differences in tissue
characteristics when determining effective dose to biologic material?
Tissue weighting factors (W t )
Radiation weighting factors (W r )
Absorbed dose
Which cell types have the lowest radiosensitivity:
nerve cells
muscle cells
spermatids
lymphocytes - answer nerve cells (except in fetal life, they are highly radiosensitive)
Which cells are the most radiosensitive in the body - answer lymphocytes
Which interaction between x-ray photons and matter involves a high energy photon and
the ejection of an outer shell electron?
photoelectric effect
coherent scatter
Compton scatter
pair production - answer Compton scatter
What is likely to occur if 250 mGy is accidentally delivered to a recently fertilized ovum?
Skeletal anomalies
CNS anomalies
Spontaneous abortion
Childhood malignancy - answer spontaneous abortion
Primary radiation barriers include: - answer walls, doors, floors
secondary radiation barriers include - answer lead aprons, lead gloves, thyroid shields,
ceiling
In which of the following examinations would an IR front having very low absorption
properties be especially important?
Abdominal radiography
Extremity radiography
Angiography
Mammography - answermammography
The most radiosensitive portion of the GI tract is - answersmall bowel
Which of the following has (have) an effect on the amount and type of radiation-induced
tissue damage?
Quality of radiation
Type of tissue being irradiated
, Fractionation
a. 1 only
b. 1 and 2
c. 1 and 3
d. all 3 - answerall 3
How is the intensity of an x-ray photon affected after each time it scatters?
Its intensity increases 4 times.
Its intensity increases 1000 times.
Its intensity decreases 4 times.
Its intensity decreases 1000 times. - answerits intensity decreases 1000 times
breaks the DNA molecule into two or more pieces. - answermain-chain scission
incorrect joining of broken DNA fragments. - answercross-linking
the disruption of a single chemical bond as a result of irradiation. - answerpoint lesion
Irradiation of macromolecules in vitro can result in
main-chain scission
cross-linking
point lesions
a. 1 only
b. 1 and 2
c. 2 and 3
d. all 3 - answerall 3
The National Council on Radiation Protection and Measurements (NCRP) recommends
an annual occupational effective (stochastic) dose equivalent limit of
1 mSv.
5 mSv.
15 mSv.
50 mSv. - answer50 mSv
What is the established fetal dose-limit guideline for pregnant radiographers during the
entire gestation period?
1.0 mSv
5.0 mSv
50 mSv
100 mSv - answer5 mSv
Which of the following is (are) used to account for the differences in tissue
characteristics when determining effective dose to biologic material?
Tissue weighting factors (W t )
Radiation weighting factors (W r )
Absorbed dose
