RADIATION THERAPY BOARD EXAM REVIEW -
MOSBY QUESTIONS AND ANSWERS 2025
Orth voltage machines operated in the range of
A. 10-40 KV
B. 100 KV
C. 100-200 KV
D. 150-500 KV - CORRECT ANSWER -D. 150-500 KV
0.01 J/Kg is equivalent to:
A. 1 Roentgen
B. 1 RAD
C. 1 Gee
D. 1 Be - CORRECT ANSWER -B. 1 RAD
A pocket dosimeter is a
A. low energy dosimeter
B. thermoluminescent dosimeter
C. cutie pie
D. none of the above - CORRECT ANSWER -A. low energy dosimeter
Traditional unit of absorbed dose equivalent.
A. REM
B. RAD
C. Roentgen
D. RBE - CORRECT ANSWER -A. REM
Unit of exposure in air is:
A. Roentgen
B. Planck
C. Curie
D. REM - CORRECT ANSWER -A. Roentgen
Annual dose lime for occupational exposure.
A. 5 REM
B. 15 REM
C. 30 REM
D. 50 REM - CORRECT ANSWER -D. 50 REM.
500 move --> 50 REM
,Annual dose limit for the general public is:
A. 0.1 REM
B. 0.5 REM
C. 1 REM
D. 5 REM - CORRECT ANSWER -A. 0.1 REM
0.1 REM --> 1 move
When a patient is treated with Iodine 131 the room should be labeled as:
A. High radiation- grave danger
B. Caution: radioactive materials
C. Caution: high Dose radiation
D. Do not enter: radiation at excessive levels - CORRECT ANSWER -B. caution:
radioactive materials
When calibrating ion chambers, which are needed?
1. Barometric pressure
2. volume of chamber
3. temperature
4.beam energy - CORRECT ANSWER -1, 2, 3 but NOT beam energy
for a controlled area, the shielding must be sufficient to reduce exposure to no more
than:
A. 1 men/hr
B. 10 men/hr
C. 1 men/week
D. 100 men/ week - CORRECT ANSWER -D. 100 men/week
0.1 REM/week --> 100 men/Week
Light field and radiation field congruence should be checked:
A. daily
B. monthly
C. weekly
D. semiannually - CORRECT ANSWER -B. monthly
The most convenient and economical method of whole body personnel monitoring:
A. pocket dosimeter
B. film badge
C. TLD
D. Geiger counter - CORRECT ANSWER -B. film badge
,annual dose limit for members of the general public is:
A. 0.1 rem
B. 0.5 rem
C. 1.0 rem
D. 5.0 rem - CORRECT ANSWER -A. 0.1 rem
(1 move = 0.1 rem)
radiation level reaching 60 memo/hr is classified as:
A. radiation area
B. high radiation area
C. very high radiation area
D. dangerous radiation area - CORRECT ANSWER -A. radiation area
(high radiation area = >100 memo/hr)
When calibrating ion chambers, which of the following factors are needed?
1. barometric pressure
2. volume of the chamber
3. temperature
4. beam energy - CORRECT ANSWER -1, 2, and 3
for a controlled area, the shielding must be sufficient to reduce exposure to no more
than:
A. 1 memo/hr
B. 10 memo/hr
C. 1 memo/week
D. 100 memo/week - CORRECT ANSWER -D. 100 memo/week (0.1 rem/week)
the basic types of interaction between x-ray and matter includes all except:
A. Compton scatter
B. radiative bremsstrahlung production
C. photoelectric absorption
D. pair production - CORRECT ANSWER -B. radiative bremsstrahlung production
(product of electron integration with matter)
What is the SI unit for exposure (roentgen - traditional) - CORRECT ANSWER -
coulomb/kg or air?
prodromal stage of acute radiation syndrome consists of:
A. nausea
B. fatigue
, C. leukopenia
D. bleeding - CORRECT ANSWER -A. nausea (also vomiting)
when radiation interacts with radiographic film contained in the film badge, after
development:
A. the film darkens proportional to the exposure
B. the film lightens proportional to the exposure
C. the film shows artifacts proportional to exposure
D. the film has to be exposed to a charged field for interpretation - CORRECT ANSWER
-A. the film darkens proportional to the exposure
two or more chemicals with the same chemical formula, but different nuclear states are
known as:
A. isomers
B. isotopes
C. isobars
D. isotones - CORRECT ANSWER -A. isomers
wavelengths of x-rays are measured in:
A. mm
B. cm
C. roentgens
D. angstroms - CORRECT ANSWER -D. angstroms
as the wavelength of light is decreased, the speed is:
A. increased linearly
B. decried linearly
C. unchanged
D. increased exponentially - CORRECT ANSWER -C. unchanged
the process of cell growth and development is called:
A. mitosis
B. meiosis
C. differentiation
D. proliferation - CORRECT ANSWER -D. proliferation
Which of the following cells has the highest radio sensitivity?
A. neurons
B. chondrocytes
C. osteoblasts
MOSBY QUESTIONS AND ANSWERS 2025
Orth voltage machines operated in the range of
A. 10-40 KV
B. 100 KV
C. 100-200 KV
D. 150-500 KV - CORRECT ANSWER -D. 150-500 KV
0.01 J/Kg is equivalent to:
A. 1 Roentgen
B. 1 RAD
C. 1 Gee
D. 1 Be - CORRECT ANSWER -B. 1 RAD
A pocket dosimeter is a
A. low energy dosimeter
B. thermoluminescent dosimeter
C. cutie pie
D. none of the above - CORRECT ANSWER -A. low energy dosimeter
Traditional unit of absorbed dose equivalent.
A. REM
B. RAD
C. Roentgen
D. RBE - CORRECT ANSWER -A. REM
Unit of exposure in air is:
A. Roentgen
B. Planck
C. Curie
D. REM - CORRECT ANSWER -A. Roentgen
Annual dose lime for occupational exposure.
A. 5 REM
B. 15 REM
C. 30 REM
D. 50 REM - CORRECT ANSWER -D. 50 REM.
500 move --> 50 REM
,Annual dose limit for the general public is:
A. 0.1 REM
B. 0.5 REM
C. 1 REM
D. 5 REM - CORRECT ANSWER -A. 0.1 REM
0.1 REM --> 1 move
When a patient is treated with Iodine 131 the room should be labeled as:
A. High radiation- grave danger
B. Caution: radioactive materials
C. Caution: high Dose radiation
D. Do not enter: radiation at excessive levels - CORRECT ANSWER -B. caution:
radioactive materials
When calibrating ion chambers, which are needed?
1. Barometric pressure
2. volume of chamber
3. temperature
4.beam energy - CORRECT ANSWER -1, 2, 3 but NOT beam energy
for a controlled area, the shielding must be sufficient to reduce exposure to no more
than:
A. 1 men/hr
B. 10 men/hr
C. 1 men/week
D. 100 men/ week - CORRECT ANSWER -D. 100 men/week
0.1 REM/week --> 100 men/Week
Light field and radiation field congruence should be checked:
A. daily
B. monthly
C. weekly
D. semiannually - CORRECT ANSWER -B. monthly
The most convenient and economical method of whole body personnel monitoring:
A. pocket dosimeter
B. film badge
C. TLD
D. Geiger counter - CORRECT ANSWER -B. film badge
,annual dose limit for members of the general public is:
A. 0.1 rem
B. 0.5 rem
C. 1.0 rem
D. 5.0 rem - CORRECT ANSWER -A. 0.1 rem
(1 move = 0.1 rem)
radiation level reaching 60 memo/hr is classified as:
A. radiation area
B. high radiation area
C. very high radiation area
D. dangerous radiation area - CORRECT ANSWER -A. radiation area
(high radiation area = >100 memo/hr)
When calibrating ion chambers, which of the following factors are needed?
1. barometric pressure
2. volume of the chamber
3. temperature
4. beam energy - CORRECT ANSWER -1, 2, and 3
for a controlled area, the shielding must be sufficient to reduce exposure to no more
than:
A. 1 memo/hr
B. 10 memo/hr
C. 1 memo/week
D. 100 memo/week - CORRECT ANSWER -D. 100 memo/week (0.1 rem/week)
the basic types of interaction between x-ray and matter includes all except:
A. Compton scatter
B. radiative bremsstrahlung production
C. photoelectric absorption
D. pair production - CORRECT ANSWER -B. radiative bremsstrahlung production
(product of electron integration with matter)
What is the SI unit for exposure (roentgen - traditional) - CORRECT ANSWER -
coulomb/kg or air?
prodromal stage of acute radiation syndrome consists of:
A. nausea
B. fatigue
, C. leukopenia
D. bleeding - CORRECT ANSWER -A. nausea (also vomiting)
when radiation interacts with radiographic film contained in the film badge, after
development:
A. the film darkens proportional to the exposure
B. the film lightens proportional to the exposure
C. the film shows artifacts proportional to exposure
D. the film has to be exposed to a charged field for interpretation - CORRECT ANSWER
-A. the film darkens proportional to the exposure
two or more chemicals with the same chemical formula, but different nuclear states are
known as:
A. isomers
B. isotopes
C. isobars
D. isotones - CORRECT ANSWER -A. isomers
wavelengths of x-rays are measured in:
A. mm
B. cm
C. roentgens
D. angstroms - CORRECT ANSWER -D. angstroms
as the wavelength of light is decreased, the speed is:
A. increased linearly
B. decried linearly
C. unchanged
D. increased exponentially - CORRECT ANSWER -C. unchanged
the process of cell growth and development is called:
A. mitosis
B. meiosis
C. differentiation
D. proliferation - CORRECT ANSWER -D. proliferation
Which of the following cells has the highest radio sensitivity?
A. neurons
B. chondrocytes
C. osteoblasts
