The probability of occurance of Compton interactions decreases as x-ray photon
energy (kVp):
A. Remains constant
B. Increases
C. Fluctuates from AC to DC
D. Decreases
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B. Increases
To determine D, the amount of energy absorbed by the irradiatied object must be
measured by:
A. Calculating EqD
B. Calculating the entrance skin exposure of the object
,C. Determining the amount of energy deposited per kilogram of the irradiated object
D. Determining the amount of ionization in a specific volume of dry air at atmospheric
pressure
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C. Determining the amount of energy deposited per kilogram of the
irradiated object
A radiation weighting factor (WR) has been established for each of the following
ionizing radiations: x-rays (WR=1), protons (WR=2), and alpha particles (WR=20). What
is the total equivalent dose (EqD) in rem for a person who has received the following
exposures: 20 rad of x-rays, 7 rad of fast neutrons, and 30 rad of alpha particles?
A. 634 rem
B. 317 rem
C. 57 rem
D. 6.34 rem
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A. 634 rem
EqD = (D x WR)1 + (D x WR)2 + (D x WR)3
20 x 1 = 20; 7 x 2 = 14; 30 x 20 = 600
20 + 14 + 600 = 634
To decrease patient exposure during fluoroscopic procedures, the fluoroscopist can:
1. Limit the size of the fluoroscopic field to include only the area of anatomy that is of
clinical interest
2. Employ the practice of intermittent, or pulsed, fluoroscopy to reduce the overall
length of exposure
,3. Choose to use a conventional fluoroscope instead of an image intensification
fluoroscope
A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2, and 3
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A. 1 and 2 only
Which of the follwoing types of blood cells is the most radiosensitive in the body?
A. Erythrocytes
B. Granulocytes
C. Lymphocytes
D. Thrombocytes
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C. Lymphocytes
The lead glass window of the control booth barrier in a stationary (fixed) radiographic
installation typically consists of which of the following?
A. 0.25 mm lead equivalent
B. 0.5 mm lead equivalent
C. 1 mm lead equivalent
D. 1.5 mm lead equivalent
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, D. 1.5 mm lead equivalent
Determine the total dose equivalent (DE) in sievert for a person who has received the
following exposures of radiation: 37 rad x-rays, Q=1; 28 rad thermal (slow) neutrons,
Q=5; and 10 rad fast neutrons, Q=20.
A. 3.77 sievert
B. 37.7 sievert
C. 377 sievert
D. 3,770 sievert
E. 37,700 sievert
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A. 3.77 sievert
DE = D x Q
37 x 1 = 37; 28 x 5 = 140; 10 x 20 = 200
37+140+200=377
Sievert = Rad/100
377/100=3.77
Medical radiation procedures account for:
A. The largest dose of ionizing radiation received by human beings
B. The second largest dose of ionizing radiation received by human beings
C. The smallest dose of ionizing radiation received by human beings
D. Negligible doses of ionizing radiation received by human beings
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energy (kVp):
A. Remains constant
B. Increases
C. Fluctuates from AC to DC
D. Decreases
Give this one a try later!
B. Increases
To determine D, the amount of energy absorbed by the irradiatied object must be
measured by:
A. Calculating EqD
B. Calculating the entrance skin exposure of the object
,C. Determining the amount of energy deposited per kilogram of the irradiated object
D. Determining the amount of ionization in a specific volume of dry air at atmospheric
pressure
Give this one a try later!
C. Determining the amount of energy deposited per kilogram of the
irradiated object
A radiation weighting factor (WR) has been established for each of the following
ionizing radiations: x-rays (WR=1), protons (WR=2), and alpha particles (WR=20). What
is the total equivalent dose (EqD) in rem for a person who has received the following
exposures: 20 rad of x-rays, 7 rad of fast neutrons, and 30 rad of alpha particles?
A. 634 rem
B. 317 rem
C. 57 rem
D. 6.34 rem
Give this one a try later!
A. 634 rem
EqD = (D x WR)1 + (D x WR)2 + (D x WR)3
20 x 1 = 20; 7 x 2 = 14; 30 x 20 = 600
20 + 14 + 600 = 634
To decrease patient exposure during fluoroscopic procedures, the fluoroscopist can:
1. Limit the size of the fluoroscopic field to include only the area of anatomy that is of
clinical interest
2. Employ the practice of intermittent, or pulsed, fluoroscopy to reduce the overall
length of exposure
,3. Choose to use a conventional fluoroscope instead of an image intensification
fluoroscope
A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2, and 3
Give this one a try later!
A. 1 and 2 only
Which of the follwoing types of blood cells is the most radiosensitive in the body?
A. Erythrocytes
B. Granulocytes
C. Lymphocytes
D. Thrombocytes
Give this one a try later!
C. Lymphocytes
The lead glass window of the control booth barrier in a stationary (fixed) radiographic
installation typically consists of which of the following?
A. 0.25 mm lead equivalent
B. 0.5 mm lead equivalent
C. 1 mm lead equivalent
D. 1.5 mm lead equivalent
Give this one a try later!
, D. 1.5 mm lead equivalent
Determine the total dose equivalent (DE) in sievert for a person who has received the
following exposures of radiation: 37 rad x-rays, Q=1; 28 rad thermal (slow) neutrons,
Q=5; and 10 rad fast neutrons, Q=20.
A. 3.77 sievert
B. 37.7 sievert
C. 377 sievert
D. 3,770 sievert
E. 37,700 sievert
Give this one a try later!
A. 3.77 sievert
DE = D x Q
37 x 1 = 37; 28 x 5 = 140; 10 x 20 = 200
37+140+200=377
Sievert = Rad/100
377/100=3.77
Medical radiation procedures account for:
A. The largest dose of ionizing radiation received by human beings
B. The second largest dose of ionizing radiation received by human beings
C. The smallest dose of ionizing radiation received by human beings
D. Negligible doses of ionizing radiation received by human beings
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