Mock Exam Dosimetry questions with verified answers
"Cutie Pie" is another name for which radiation survey instrument?
Ans✓✓✓ ionization chamber
"The study of the sequence of events that follows the absorption of
energy from ionizing radiation, the efforts of the organism to
compensate for the effects of this energy absorption, and the damage
to the organism that may be produced" is the definition of what?
Ans✓✓✓ Radiobiology
1 Ci = 3.7 x 1010 Bq Ans✓✓✓ True
1 cm of lead equal ____ cm of cerrobend Ans✓✓✓ 1.2 cm
1 cm of lead equal ____________cm of cerrobend. Ans✓✓✓ 1. 2 cm
1 Gy equals Ans✓✓✓ 100 rad, 100 cGy, 1 J/kg
1 Gy equals.. Ans✓✓✓ 100 rad, 100 cGy, 1 J/kg
10 mCi of radium is equivalent to how many mCi of gold? (The specific
gamma ray constant of gold is 2.34 Rcm2 /mg/hr) Ans✓✓✓ 35 mCi
,100 millicuries of Radon 222 are implanted in a patient. The patient is
to be hospitalized until less than 30 mCi of activity is remaining. How
many days does the patient have to stay in the hospital? Ans✓✓✓ 6
days
28Ni60 31Ga60, Ir192 IR192m, 27Fe59 27Fe58, 11Na22 10Ne21
Ans✓✓✓ isobars, isomers, isotopes, isotones
3 Ci =___________________MBq Ans✓✓✓ 111,000 MBq
5 rem =______________Sv Ans✓✓✓ 0.05 Sv
5.4 Gy equals _______________cGy? Ans✓✓✓ 540 cGy
A 12 MeV electron beam is being used to treat a right breast tumor
bed. The chestwall is 4 cm from the surface of the skin. How far will the
electrons travel in the lung beyond the chestwall? Ans✓✓✓ 6 cm
A 12 MeV electron beam is being used to treat a right breast tumor
bed. The chestwall is 4 cm from the surface of the skin. How far will the
electrons travel in the lung beyond the chestwall? Ans✓✓✓ 6 cm
A 12 MeV electron beam set-up is done using a 15 x 15 cm cone with a
cerrobend cutout. Output factor of 1.029 cGy/mu at Dmax. The
,prescription calls for 200 cGy to be delivered to the 90% isodose level.
Calculate the monitor unit Ans✓✓✓ 216 MU
A 15 mg (MRE) linear source of Cesium-137 is implanted in tissue.
Calculate the dose rate at a distance of 2 cm perpendicular from the
center of the source given Manchester data of 541 mg-hrs/1000 cGy.
Ans✓✓✓ 27.7 cGy/ hr
A 18X beam is calibrated at 1.01 cGy/MU at a SSD of 100 cm. For a SAD
set-up, the calibration correction would be what? Ans✓✓✓ 1.082
cGy/MU
A 24 cm patient is being treated to mid-plane. A 3 mm source is being
used. The SSD is 100 cm and the SDD is 52 cm. What is the geometric
penumbra at mid-plane? Ans✓✓✓ 3.46 mm
A 4.2 cm long Ra needle is 5 cm long on a radiograph. The TFD = 120
cm. What is the distance from the needle to the film? Ans✓✓✓ 19.2
cm
A beam spoiler utilized for TSET...
Select one:
A. decreases the average energy of the beam
B. increases the average energy of the beam
C. increases scatter
, D. decreases scatter Ans✓✓✓ a & c
A binary system involves numbers.... Ans✓✓✓ 0 and 1
A bone marrow transplant patient is scheduled to receive total body
treatment with 6 MV photons. The patient separation at isocenter is 26
cm. The field size is 40 x 40 cm using an SSD of 400 cm. The prescription
is 1200 cGy over 4 days, treated BID 6 hrs apart. Ans✓✓✓ 3011 MU
A breast boost is to be treated with a 10 x 10 cone. A cutout will be
used with a factor of 0.988. 1200 cGy is to be delivered in 6 fx to the
95% line using a 9 MeV beam. Calculate the MU's. Ans✓✓✓ 213 Mu's
A breast tangent field has a field size of 15 x 17. The MLC's are used to
block along the lung and this block equates to 3 x 17. Choose the best
answer below. Ans✓✓✓ The blocked equivlanet square will be less
than 14.1.
A byte is a group of..... Ans✓✓✓ 8 bits
A clinical trial phase that involves a large number of patients and is to
determine if a new drug or XRT regimen is superior to the current
standard of practice is... Ans✓✓✓ A phase III trial
A conventional simulator can be utilized for....
"Cutie Pie" is another name for which radiation survey instrument?
Ans✓✓✓ ionization chamber
"The study of the sequence of events that follows the absorption of
energy from ionizing radiation, the efforts of the organism to
compensate for the effects of this energy absorption, and the damage
to the organism that may be produced" is the definition of what?
Ans✓✓✓ Radiobiology
1 Ci = 3.7 x 1010 Bq Ans✓✓✓ True
1 cm of lead equal ____ cm of cerrobend Ans✓✓✓ 1.2 cm
1 cm of lead equal ____________cm of cerrobend. Ans✓✓✓ 1. 2 cm
1 Gy equals Ans✓✓✓ 100 rad, 100 cGy, 1 J/kg
1 Gy equals.. Ans✓✓✓ 100 rad, 100 cGy, 1 J/kg
10 mCi of radium is equivalent to how many mCi of gold? (The specific
gamma ray constant of gold is 2.34 Rcm2 /mg/hr) Ans✓✓✓ 35 mCi
,100 millicuries of Radon 222 are implanted in a patient. The patient is
to be hospitalized until less than 30 mCi of activity is remaining. How
many days does the patient have to stay in the hospital? Ans✓✓✓ 6
days
28Ni60 31Ga60, Ir192 IR192m, 27Fe59 27Fe58, 11Na22 10Ne21
Ans✓✓✓ isobars, isomers, isotopes, isotones
3 Ci =___________________MBq Ans✓✓✓ 111,000 MBq
5 rem =______________Sv Ans✓✓✓ 0.05 Sv
5.4 Gy equals _______________cGy? Ans✓✓✓ 540 cGy
A 12 MeV electron beam is being used to treat a right breast tumor
bed. The chestwall is 4 cm from the surface of the skin. How far will the
electrons travel in the lung beyond the chestwall? Ans✓✓✓ 6 cm
A 12 MeV electron beam is being used to treat a right breast tumor
bed. The chestwall is 4 cm from the surface of the skin. How far will the
electrons travel in the lung beyond the chestwall? Ans✓✓✓ 6 cm
A 12 MeV electron beam set-up is done using a 15 x 15 cm cone with a
cerrobend cutout. Output factor of 1.029 cGy/mu at Dmax. The
,prescription calls for 200 cGy to be delivered to the 90% isodose level.
Calculate the monitor unit Ans✓✓✓ 216 MU
A 15 mg (MRE) linear source of Cesium-137 is implanted in tissue.
Calculate the dose rate at a distance of 2 cm perpendicular from the
center of the source given Manchester data of 541 mg-hrs/1000 cGy.
Ans✓✓✓ 27.7 cGy/ hr
A 18X beam is calibrated at 1.01 cGy/MU at a SSD of 100 cm. For a SAD
set-up, the calibration correction would be what? Ans✓✓✓ 1.082
cGy/MU
A 24 cm patient is being treated to mid-plane. A 3 mm source is being
used. The SSD is 100 cm and the SDD is 52 cm. What is the geometric
penumbra at mid-plane? Ans✓✓✓ 3.46 mm
A 4.2 cm long Ra needle is 5 cm long on a radiograph. The TFD = 120
cm. What is the distance from the needle to the film? Ans✓✓✓ 19.2
cm
A beam spoiler utilized for TSET...
Select one:
A. decreases the average energy of the beam
B. increases the average energy of the beam
C. increases scatter
, D. decreases scatter Ans✓✓✓ a & c
A binary system involves numbers.... Ans✓✓✓ 0 and 1
A bone marrow transplant patient is scheduled to receive total body
treatment with 6 MV photons. The patient separation at isocenter is 26
cm. The field size is 40 x 40 cm using an SSD of 400 cm. The prescription
is 1200 cGy over 4 days, treated BID 6 hrs apart. Ans✓✓✓ 3011 MU
A breast boost is to be treated with a 10 x 10 cone. A cutout will be
used with a factor of 0.988. 1200 cGy is to be delivered in 6 fx to the
95% line using a 9 MeV beam. Calculate the MU's. Ans✓✓✓ 213 Mu's
A breast tangent field has a field size of 15 x 17. The MLC's are used to
block along the lung and this block equates to 3 x 17. Choose the best
answer below. Ans✓✓✓ The blocked equivlanet square will be less
than 14.1.
A byte is a group of..... Ans✓✓✓ 8 bits
A clinical trial phase that involves a large number of patients and is to
determine if a new drug or XRT regimen is superior to the current
standard of practice is... Ans✓✓✓ A phase III trial
A conventional simulator can be utilized for....
