RADIATION PROTECTION ARRT STUDY GUIDE
What is used to account for the differences in tissue sensitivity to ionizing radiation
when determining effective dose E
Choose all that apply
1. Tissue weighting factors Wt
2. Radiation weighting factors Wr
3. Absorbed dose - ANSWER 1. Tissue weighting factors Wt
Bushong 8th edition page 556
The _______ represents the relative tissue _______ of irradiated material examples
muscle vs intestinal epithelium vs bone
1. Tissue weighting factors Wt/radiosensitivity
2. Radiation weighting factors Wr/radiosensitivity
3. Absorbed dose/radiosensitivity - ANSWER 1. Tissue weighting factors
Wt/radiosensitivity
Bushong 8th edition page 556
The radiation ______ is a number assigned to different types of ______ in order to
better determine their effect on tissue examples xray vs alpha particles.
1. Tissue weighting factors Wt/ionizing radiations
2. weighting factor Wr/ionizing radiations
3. Absorbed dose/ionizing radiations - ANSWER 2. weighting factor Wr/ionizing
radiations
Bushong 8th edition page 556
The Wr of the different ionizing radiations depends on the ______ of that particular
radiation.
1. BET
2. EBT
3. LET - ANSWER 3. LET
Bushong 8th edition page 556
The following formula is used to determine effective dose E:
,1. E=Wr x Wt x absorbed dose
2. E=Wr + Wt + absorbed dose
3. E=Wr - Wt - absorbed dose - ANSWER 1. E=Wr x Wt x absorbed dose
Bushong 8th edition page 556
According to the national council on radiation protection and measurements NCRP,
the monthly gestational dose equivalent limit for embryo/fetus of a pregnant
radiographer is
a. 0.1 mSv
b. 0.5 mSv
c. 1.0 mSv
d. 5.0 mSv - ANSWER b. 0.5 mSv
Bushong 8th edition page 557
________ which expresses the rate at which particulate or photon energy is
transferred to the absorber
1. BET
2. EBT
3. LET - ANSWER 3. LET
Thompson et al page 419
LET is best defined as
Choose all that apply
1. a method of expressing radiation
2. a measure of the rate at which radiation energy is transferred to soft tissue
3. absorption of polyenergetic radiation - ANSWER 1. a method of expressing
radiation
2. a measure of the rate at which radiation energy is transferred to soft tissue
Thompson et al page 419
Guidelines state that the occupational gestational dose equivalent limit for
embryo/fetus of a pregnant radiographer is ______, not to exceed ______in 1 month
a. 5 mSv aka 500 mrem
b. 5 mSv aka 200 mrem
c. 5 mSv aka 100 mrem - ANSWER a. 5 mSv aka 500 mrem/0.5 mSv
Bushong 8th edition page 557
,According to the NCRP the annual occupational whole body dose equivalent limit is
_____ mSv (5 rem or 5,000 mrem).
A. 20
B. 30
C. 50 - ANSWER C. 50 mSv
Bushong 8th edition page 557
The annual occupational whole body dose equivalent limit for students under the age
of 18 years is 1 mSv aka 100 mrem or 0.1 rem.
a. 10 mSv
b. 100 mSv
c. 1 mSv - ANSWER c. 1 mSv
Bushong 8th edition page 557
The annual occupational dose equivalent limit for the lens of eye is ______
a. 350 mSv aka 15 rem
b. 550 mSv aka 15 rem
c. 150 mSv aka 15 rem - ANSWER c. 150 mSv aka 15 rem
Bushong 8th edition page 557
The annual occupational dose equivalent limit for the thyroid, skin and extremities is
_______
a. 200 mSv aka 50 rem.
b. 300 mSv aka 50 rem.
c. 500 mSv aka 50 rem. - ANSWER c. 500 mSv aka 50 rem
Bushong 8th edition page 557
A time of 1.5 minutes is required for a particular fluoroscopic examination, whose
exposure rate is 275 mR/h. What is the approximate radiation exposure for the
radiologic staff present in the fluoroscopy room during the examination
a. 183 mR
b. 68.7 mR
c. 18.33 mR
d. 6.87 mR - ANSWER d. 6.87 mR
{(275 mR/h) / 60minutes } / 1.5 minutes = 6.87 mR
, Bushong 8th edition page 570
If the exposure rate to an individual standing 4.0 m from a source of radiation is 10
mR/h what will be the dose received after 20 minutes at a distance of 6 m from the
source
a. 22.5 mR
b. 7.5 mR
c. 4.44 mR
d. 1.48 mR - ANSWER d. 1.48 mR
Bushong 8th edition page 570
I1/I2 = D2^2/D1^1
(10mR/h) / ? =6^2 /4^2 =4.44 mR then convert to minutes = 1.48 mR
All the following statements regarding mobile radiographic equipment are true except
a. the exposure cord must permit the operator to stand at least 6 ft from the patient
xray tube and useful beam
b. exposure switches must be the two stage type
c. a lead apron should be carried with the unit and worn by the radiographer during
exposure
d. the radiographer must alert individuals in the are before making the exposure -
ANSWER b. exposure switches must be the two stage type
NCRP Report No 102 page 25
______ states that the exposure switch on mobile radiographic units shall be so
arranged that the operator can stand at least ______from the patient, xray tube, and
useful beam
a. NCRP Report No 106/2 m or 6 ft
b. NCRP Report No 122/2 m or 6 ft
c.NCRP Report No 102/2 m or 6 ft - ANSWER c. NCRP Report No 102/2 m or 6 ft
NCRP Report No 102 page 25
The fluoroscopic and/or radiographic exposure switch or switches must be of the
______ that is the exposure will terminate should the switch be released
1. dead man type
What is used to account for the differences in tissue sensitivity to ionizing radiation
when determining effective dose E
Choose all that apply
1. Tissue weighting factors Wt
2. Radiation weighting factors Wr
3. Absorbed dose - ANSWER 1. Tissue weighting factors Wt
Bushong 8th edition page 556
The _______ represents the relative tissue _______ of irradiated material examples
muscle vs intestinal epithelium vs bone
1. Tissue weighting factors Wt/radiosensitivity
2. Radiation weighting factors Wr/radiosensitivity
3. Absorbed dose/radiosensitivity - ANSWER 1. Tissue weighting factors
Wt/radiosensitivity
Bushong 8th edition page 556
The radiation ______ is a number assigned to different types of ______ in order to
better determine their effect on tissue examples xray vs alpha particles.
1. Tissue weighting factors Wt/ionizing radiations
2. weighting factor Wr/ionizing radiations
3. Absorbed dose/ionizing radiations - ANSWER 2. weighting factor Wr/ionizing
radiations
Bushong 8th edition page 556
The Wr of the different ionizing radiations depends on the ______ of that particular
radiation.
1. BET
2. EBT
3. LET - ANSWER 3. LET
Bushong 8th edition page 556
The following formula is used to determine effective dose E:
,1. E=Wr x Wt x absorbed dose
2. E=Wr + Wt + absorbed dose
3. E=Wr - Wt - absorbed dose - ANSWER 1. E=Wr x Wt x absorbed dose
Bushong 8th edition page 556
According to the national council on radiation protection and measurements NCRP,
the monthly gestational dose equivalent limit for embryo/fetus of a pregnant
radiographer is
a. 0.1 mSv
b. 0.5 mSv
c. 1.0 mSv
d. 5.0 mSv - ANSWER b. 0.5 mSv
Bushong 8th edition page 557
________ which expresses the rate at which particulate or photon energy is
transferred to the absorber
1. BET
2. EBT
3. LET - ANSWER 3. LET
Thompson et al page 419
LET is best defined as
Choose all that apply
1. a method of expressing radiation
2. a measure of the rate at which radiation energy is transferred to soft tissue
3. absorption of polyenergetic radiation - ANSWER 1. a method of expressing
radiation
2. a measure of the rate at which radiation energy is transferred to soft tissue
Thompson et al page 419
Guidelines state that the occupational gestational dose equivalent limit for
embryo/fetus of a pregnant radiographer is ______, not to exceed ______in 1 month
a. 5 mSv aka 500 mrem
b. 5 mSv aka 200 mrem
c. 5 mSv aka 100 mrem - ANSWER a. 5 mSv aka 500 mrem/0.5 mSv
Bushong 8th edition page 557
,According to the NCRP the annual occupational whole body dose equivalent limit is
_____ mSv (5 rem or 5,000 mrem).
A. 20
B. 30
C. 50 - ANSWER C. 50 mSv
Bushong 8th edition page 557
The annual occupational whole body dose equivalent limit for students under the age
of 18 years is 1 mSv aka 100 mrem or 0.1 rem.
a. 10 mSv
b. 100 mSv
c. 1 mSv - ANSWER c. 1 mSv
Bushong 8th edition page 557
The annual occupational dose equivalent limit for the lens of eye is ______
a. 350 mSv aka 15 rem
b. 550 mSv aka 15 rem
c. 150 mSv aka 15 rem - ANSWER c. 150 mSv aka 15 rem
Bushong 8th edition page 557
The annual occupational dose equivalent limit for the thyroid, skin and extremities is
_______
a. 200 mSv aka 50 rem.
b. 300 mSv aka 50 rem.
c. 500 mSv aka 50 rem. - ANSWER c. 500 mSv aka 50 rem
Bushong 8th edition page 557
A time of 1.5 minutes is required for a particular fluoroscopic examination, whose
exposure rate is 275 mR/h. What is the approximate radiation exposure for the
radiologic staff present in the fluoroscopy room during the examination
a. 183 mR
b. 68.7 mR
c. 18.33 mR
d. 6.87 mR - ANSWER d. 6.87 mR
{(275 mR/h) / 60minutes } / 1.5 minutes = 6.87 mR
, Bushong 8th edition page 570
If the exposure rate to an individual standing 4.0 m from a source of radiation is 10
mR/h what will be the dose received after 20 minutes at a distance of 6 m from the
source
a. 22.5 mR
b. 7.5 mR
c. 4.44 mR
d. 1.48 mR - ANSWER d. 1.48 mR
Bushong 8th edition page 570
I1/I2 = D2^2/D1^1
(10mR/h) / ? =6^2 /4^2 =4.44 mR then convert to minutes = 1.48 mR
All the following statements regarding mobile radiographic equipment are true except
a. the exposure cord must permit the operator to stand at least 6 ft from the patient
xray tube and useful beam
b. exposure switches must be the two stage type
c. a lead apron should be carried with the unit and worn by the radiographer during
exposure
d. the radiographer must alert individuals in the are before making the exposure -
ANSWER b. exposure switches must be the two stage type
NCRP Report No 102 page 25
______ states that the exposure switch on mobile radiographic units shall be so
arranged that the operator can stand at least ______from the patient, xray tube, and
useful beam
a. NCRP Report No 106/2 m or 6 ft
b. NCRP Report No 122/2 m or 6 ft
c.NCRP Report No 102/2 m or 6 ft - ANSWER c. NCRP Report No 102/2 m or 6 ft
NCRP Report No 102 page 25
The fluoroscopic and/or radiographic exposure switch or switches must be of the
______ that is the exposure will terminate should the switch be released
1. dead man type
