MDCB UPDATED EXAM QUESTIONS AND
CORRECT ANSWERS
Penumbra size - CORRECT ANSWERS S((ssd+d-sdd)/sdd)
Number of HVL - CORRECT ANSWERS (1/2)^n=activity
1Roentgens - CORRECT ANSWERS 10 mSv
2.58x10^-4 C/kg of air
Activity calculation - CORRECT ANSWERS A=A0 e ^ -lamda(t)
Absorbed Dose SI - CORRECT ANSWERS Gy=100 rad
Dose Equivalent - CORRECT ANSWERS Absorbed x factor alpha 20, rest 1
rem or Sv
Sievert to rem - CORRECT ANSWERS 1Sv=100rem
Rad Units Activity - CORRECT ANSWERS SI: Bq
Ci
Exposure Units - CORRECT ANSWERS SI:R
C/kg
,Absorbed Dose Units - CORRECT ANSWERS SI: Gy
rad
Dose Equivalent or Eff. Dose Eq. (H) Units - CORRECT ANSWERS SI: Sv
rem
100 rem=1Sv
depends on the type of radiaiton
Stochastic Effects - CORRECT ANSWERS random, probability of occurring increase by dose,
no relationship to severity, no threshold
ie: cancer, birth defects, mutations
Deterministic Effects (non-stochastic) - CORRECT ANSWERS thresholds dose, higher dose
more damage
ie: cataracts, organ failure
Dose rate formula with change in Distance - CORRECT ANSWERS I1 x (d1)^2 = I2 x (d2)^2
Tissue Weighting Factor, Wt
Gonads - CORRECT ANSWERS 0.20
Wt; red bone marrow, colon, lung, stomach - CORRECT ANSWERS 0.12
Wt; bladder, breast, liver esophagus, thyroid - CORRECT ANSWERS 0.05
Wt; skin, bone surfaces - CORRECT ANSWERS 0.01
,Wt; remainder - CORRECT ANSWERS 0.05
Low Level Rad Effects <10 cGy - CORRECT ANSWERS genetic effects
neoplastic disease
growth and development for a fetus or young child
cataracts
Occupational Exposure - CORRECT ANSWERS 50 mSv
5 rem
Occupational Cumulative - CORRECT ANSWERS 10 mSv x age in years
1 rem x age in years
Public: frequent exposure - CORRECT ANSWERS 1 mSv
0.1 rem
Public: infrequent exposure - CORRECT ANSWERS 5 mSv
0.5 rem
Education (<18 yrs) - CORRECT ANSWERS 1 mSv
0.1 rem
Fetus - CORRECT ANSWERS 5 mSv over gestation
0.5 rem
, 0.5 mSv per month
0.05 rem per month
Skin/Hand/Feet - CORRECT ANSWERS 100 mSv
50 rem
Lens - CORRECT ANSWERS 150 mSv
15 rem
Annual Background Radiation - CORRECT ANSWERS 360 mrem
Controlled Areas goal - CORRECT ANSWERS 5 mSv/yr
0.1 mSv/week
Uncontrolled Area goal - CORRECT ANSWERS 1 mSv/yr
0.02 mSv/wk
Occupancy Factors (T) - CORRECT ANSWERS Control Area=1
Adjacent tx Area=1/2
Employee=1/4
Definition of Medical Event - CORRECT ANSWERS >20% (brachytherapy)
wrong pt
wrong tx site
wrong isotope
CORRECT ANSWERS
Penumbra size - CORRECT ANSWERS S((ssd+d-sdd)/sdd)
Number of HVL - CORRECT ANSWERS (1/2)^n=activity
1Roentgens - CORRECT ANSWERS 10 mSv
2.58x10^-4 C/kg of air
Activity calculation - CORRECT ANSWERS A=A0 e ^ -lamda(t)
Absorbed Dose SI - CORRECT ANSWERS Gy=100 rad
Dose Equivalent - CORRECT ANSWERS Absorbed x factor alpha 20, rest 1
rem or Sv
Sievert to rem - CORRECT ANSWERS 1Sv=100rem
Rad Units Activity - CORRECT ANSWERS SI: Bq
Ci
Exposure Units - CORRECT ANSWERS SI:R
C/kg
,Absorbed Dose Units - CORRECT ANSWERS SI: Gy
rad
Dose Equivalent or Eff. Dose Eq. (H) Units - CORRECT ANSWERS SI: Sv
rem
100 rem=1Sv
depends on the type of radiaiton
Stochastic Effects - CORRECT ANSWERS random, probability of occurring increase by dose,
no relationship to severity, no threshold
ie: cancer, birth defects, mutations
Deterministic Effects (non-stochastic) - CORRECT ANSWERS thresholds dose, higher dose
more damage
ie: cataracts, organ failure
Dose rate formula with change in Distance - CORRECT ANSWERS I1 x (d1)^2 = I2 x (d2)^2
Tissue Weighting Factor, Wt
Gonads - CORRECT ANSWERS 0.20
Wt; red bone marrow, colon, lung, stomach - CORRECT ANSWERS 0.12
Wt; bladder, breast, liver esophagus, thyroid - CORRECT ANSWERS 0.05
Wt; skin, bone surfaces - CORRECT ANSWERS 0.01
,Wt; remainder - CORRECT ANSWERS 0.05
Low Level Rad Effects <10 cGy - CORRECT ANSWERS genetic effects
neoplastic disease
growth and development for a fetus or young child
cataracts
Occupational Exposure - CORRECT ANSWERS 50 mSv
5 rem
Occupational Cumulative - CORRECT ANSWERS 10 mSv x age in years
1 rem x age in years
Public: frequent exposure - CORRECT ANSWERS 1 mSv
0.1 rem
Public: infrequent exposure - CORRECT ANSWERS 5 mSv
0.5 rem
Education (<18 yrs) - CORRECT ANSWERS 1 mSv
0.1 rem
Fetus - CORRECT ANSWERS 5 mSv over gestation
0.5 rem
, 0.5 mSv per month
0.05 rem per month
Skin/Hand/Feet - CORRECT ANSWERS 100 mSv
50 rem
Lens - CORRECT ANSWERS 150 mSv
15 rem
Annual Background Radiation - CORRECT ANSWERS 360 mrem
Controlled Areas goal - CORRECT ANSWERS 5 mSv/yr
0.1 mSv/week
Uncontrolled Area goal - CORRECT ANSWERS 1 mSv/yr
0.02 mSv/wk
Occupancy Factors (T) - CORRECT ANSWERS Control Area=1
Adjacent tx Area=1/2
Employee=1/4
Definition of Medical Event - CORRECT ANSWERS >20% (brachytherapy)
wrong pt
wrong tx site
wrong isotope
