Mdcb Exam Questions and Answers
Graded A+
Penumbra size - Correct answer-S((ssd+d-sdd)/sdd)
Number of HVL - Correct answer-(1/2)^n=activity
1Roentgens - Correct answer-10 mSv
2.58x10^-4 C/kg of air
Activity calculation - Correct answer-A=A0 e ^ -lamda(t)
Absorbed Dose SI - Correct answer-Gy=100 rad
Dose Equivalent - Correct answer-Absorbed x factor alpha 20, rest 1
rem or Sv
Sievert to rem - Correct answer-1Sv=100rem
Rad Units Activity - Correct answer-SI: Bq
Ci
Exposure Units - Correct answer-SI:R
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,C/kg
Absorbed Dose Units - Correct answer-SI: Gy
rad
Dose Equivalent or Eff. Dose Eq. (H) Units - Correct answer-SI: Sv
rem
100 rem=1Sv
depends on the type of radiaiton
Stochastic Effects - Correct answer-random, probability of occurring increase by
dose, no relationship to severity, no threshold
ie: cancer, birth defects, mutations
Deterministic Effects (non-stochastic) - Correct answer-thresholds dose, higher
dose more damage
ie: cataracts, organ failure
Dose rate formula with change in Distance - Correct answer-I1 x (d1)^2 = I2 x
(d2)^2
Tissue Weighting Factor, Wt
Gonads - Correct answer-0.20
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,Wt; red bone marrow, colon, lung, stomach - Correct answer-0.12
Wt; bladder, breast, liver esophagus, thyroid - Correct answer-0.05
Wt; skin, bone surfaces - Correct answer-0.01
Wt; remainder - Correct answer-0.05
Low Level Rad Effects <10 cGy - Correct answer-genetic effects
neoplastic disease
growth and development for a fetus or young child
cataracts
Occupational Exposure - Correct answer-50 mSv
5 rem
Occupational Cumulative - Correct answer-10 mSv x age in years
1 rem x age in years
Public: frequent exposure - Correct answer-1 mSv
0.1 rem
Public: infrequent exposure - Correct answer-5 mSv
0.5 rem
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, Education (<18 yrs) - Correct answer-1 mSv
0.1 rem
Fetus - Correct answer-5 mSv over gestation
0.5 rem
0.5 mSv per month
0.05 rem per month
Skin/Hand/Feet - Correct answer-100 mSv
50 rem
Lens - Correct answer-150 mSv
15 rem
Annual Background Radiation - Correct answer-360 mrem
Controlled Areas goal - Correct answer-5 mSv/yr
0.1 mSv/week
Uncontrolled Area goal - Correct answer-1 mSv/yr
0.02 mSv/wk
Occupancy Factors (T) - Correct answer-Control Area=1
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Graded A+
Penumbra size - Correct answer-S((ssd+d-sdd)/sdd)
Number of HVL - Correct answer-(1/2)^n=activity
1Roentgens - Correct answer-10 mSv
2.58x10^-4 C/kg of air
Activity calculation - Correct answer-A=A0 e ^ -lamda(t)
Absorbed Dose SI - Correct answer-Gy=100 rad
Dose Equivalent - Correct answer-Absorbed x factor alpha 20, rest 1
rem or Sv
Sievert to rem - Correct answer-1Sv=100rem
Rad Units Activity - Correct answer-SI: Bq
Ci
Exposure Units - Correct answer-SI:R
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,C/kg
Absorbed Dose Units - Correct answer-SI: Gy
rad
Dose Equivalent or Eff. Dose Eq. (H) Units - Correct answer-SI: Sv
rem
100 rem=1Sv
depends on the type of radiaiton
Stochastic Effects - Correct answer-random, probability of occurring increase by
dose, no relationship to severity, no threshold
ie: cancer, birth defects, mutations
Deterministic Effects (non-stochastic) - Correct answer-thresholds dose, higher
dose more damage
ie: cataracts, organ failure
Dose rate formula with change in Distance - Correct answer-I1 x (d1)^2 = I2 x
(d2)^2
Tissue Weighting Factor, Wt
Gonads - Correct answer-0.20
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,Wt; red bone marrow, colon, lung, stomach - Correct answer-0.12
Wt; bladder, breast, liver esophagus, thyroid - Correct answer-0.05
Wt; skin, bone surfaces - Correct answer-0.01
Wt; remainder - Correct answer-0.05
Low Level Rad Effects <10 cGy - Correct answer-genetic effects
neoplastic disease
growth and development for a fetus or young child
cataracts
Occupational Exposure - Correct answer-50 mSv
5 rem
Occupational Cumulative - Correct answer-10 mSv x age in years
1 rem x age in years
Public: frequent exposure - Correct answer-1 mSv
0.1 rem
Public: infrequent exposure - Correct answer-5 mSv
0.5 rem
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, Education (<18 yrs) - Correct answer-1 mSv
0.1 rem
Fetus - Correct answer-5 mSv over gestation
0.5 rem
0.5 mSv per month
0.05 rem per month
Skin/Hand/Feet - Correct answer-100 mSv
50 rem
Lens - Correct answer-150 mSv
15 rem
Annual Background Radiation - Correct answer-360 mrem
Controlled Areas goal - Correct answer-5 mSv/yr
0.1 mSv/week
Uncontrolled Area goal - Correct answer-1 mSv/yr
0.02 mSv/wk
Occupancy Factors (T) - Correct answer-Control Area=1
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