MDCB |250 questions with verified answers
1 Ci = Ans✓✓✓ Disintegration of 1 gram of Ra-226
1 Curie = Ans✓✓✓ 3.7 x 10^10 disintegrations per sec
1 dps = Ans✓✓✓ 1 Bq
1 Gy = Ans✓✓✓ 1 J/kg (energy/mass)
1 mCi = Ans✓✓✓ 3.7 x 10^7 dps
1 R = ____ J/kg Ans✓✓✓ 0.00873 J/kg or air
1 R = _____ rad Ans✓✓✓ 0.873 rad
1 R = Ans✓✓✓ 1 esu/cc air (esu = electrostatic unit)
1 rad = 1 cGy, so 1 Gy = Ans✓✓✓ 100 rad
1 rad = Ans✓✓✓ 100 ergs/gram
1 Roentgen = Ans✓✓✓ 2.58 x 10^-4 C/kg air
,1 Sv = _____ J/kg Ans✓✓✓ 1
1 Sv = Ans✓✓✓ 100 rem
5 year survival rate for esophageal cancer treated with primary
radiation Ans✓✓✓ 5-10%
A/B for acute responding Ans✓✓✓ 10-20
A/B for late responding Ans✓✓✓ 2-5
A/B for lung Ans✓✓✓ 3
A/B for prostate cancer Ans✓✓✓ 2 (1.5)
A/B for skin Ans✓✓✓ 20
A/B for spinal cord Ans✓✓✓ 3
A/B for tumors Ans✓✓✓ 20
,Absorbed dose is... Ans✓✓✓ Rads
alpha = Ans✓✓✓ Direct kill component (double strand break)
Annual effecitve dose limit for continuous exposure to the whole body
for the general public Ans✓✓✓ 1 mSv (0.10 rem)
Annual Equivalent dose limit to hands of occupational worker
Ans✓✓✓ 500 mSv (50 rem)
At what energies does the dmax = surface? Ans✓✓✓ < 400 kVp
Autoradiography of encapsulated source is for Ans✓✓✓ test for gross
non-uniformity of the radionuclide
BED = Ans✓✓✓ (# of fractions) x (dose) x (Relative effectiveness [
1+d/(a/b))])
beta = Ans✓✓✓ Indirect cell kill component (single strand break)
Bladder cancer type Ans✓✓✓ transitional cell
Brachy leak checks every... Ans✓✓✓ 6 months
, Breast cancer type Ans✓✓✓ Intraductal carcinomas
Brem is produced when Ans✓✓✓ electrons strike high atomic number
targets
Central nervous system cancer type Ans✓✓✓ Astrocytomas
Cerebrovascular radiation syndrome dosage Ans✓✓✓ > 10,000 rads
Cerrobend leakage Ans✓✓✓ 3-5%
Cervix cancer type Ans✓✓✓ SCC
Closer to the nucleus = Ans✓✓✓ Higher binding energy
Co-60 decays about Ans✓✓✓ 1% every month
Collimator scatter fact is measured in Ans✓✓✓ free space with
ionization chamber
Colorectal cancer type Ans✓✓✓ adenocarcinoma
1 Ci = Ans✓✓✓ Disintegration of 1 gram of Ra-226
1 Curie = Ans✓✓✓ 3.7 x 10^10 disintegrations per sec
1 dps = Ans✓✓✓ 1 Bq
1 Gy = Ans✓✓✓ 1 J/kg (energy/mass)
1 mCi = Ans✓✓✓ 3.7 x 10^7 dps
1 R = ____ J/kg Ans✓✓✓ 0.00873 J/kg or air
1 R = _____ rad Ans✓✓✓ 0.873 rad
1 R = Ans✓✓✓ 1 esu/cc air (esu = electrostatic unit)
1 rad = 1 cGy, so 1 Gy = Ans✓✓✓ 100 rad
1 rad = Ans✓✓✓ 100 ergs/gram
1 Roentgen = Ans✓✓✓ 2.58 x 10^-4 C/kg air
,1 Sv = _____ J/kg Ans✓✓✓ 1
1 Sv = Ans✓✓✓ 100 rem
5 year survival rate for esophageal cancer treated with primary
radiation Ans✓✓✓ 5-10%
A/B for acute responding Ans✓✓✓ 10-20
A/B for late responding Ans✓✓✓ 2-5
A/B for lung Ans✓✓✓ 3
A/B for prostate cancer Ans✓✓✓ 2 (1.5)
A/B for skin Ans✓✓✓ 20
A/B for spinal cord Ans✓✓✓ 3
A/B for tumors Ans✓✓✓ 20
,Absorbed dose is... Ans✓✓✓ Rads
alpha = Ans✓✓✓ Direct kill component (double strand break)
Annual effecitve dose limit for continuous exposure to the whole body
for the general public Ans✓✓✓ 1 mSv (0.10 rem)
Annual Equivalent dose limit to hands of occupational worker
Ans✓✓✓ 500 mSv (50 rem)
At what energies does the dmax = surface? Ans✓✓✓ < 400 kVp
Autoradiography of encapsulated source is for Ans✓✓✓ test for gross
non-uniformity of the radionuclide
BED = Ans✓✓✓ (# of fractions) x (dose) x (Relative effectiveness [
1+d/(a/b))])
beta = Ans✓✓✓ Indirect cell kill component (single strand break)
Bladder cancer type Ans✓✓✓ transitional cell
Brachy leak checks every... Ans✓✓✓ 6 months
, Breast cancer type Ans✓✓✓ Intraductal carcinomas
Brem is produced when Ans✓✓✓ electrons strike high atomic number
targets
Central nervous system cancer type Ans✓✓✓ Astrocytomas
Cerebrovascular radiation syndrome dosage Ans✓✓✓ > 10,000 rads
Cerrobend leakage Ans✓✓✓ 3-5%
Cervix cancer type Ans✓✓✓ SCC
Closer to the nucleus = Ans✓✓✓ Higher binding energy
Co-60 decays about Ans✓✓✓ 1% every month
Collimator scatter fact is measured in Ans✓✓✓ free space with
ionization chamber
Colorectal cancer type Ans✓✓✓ adenocarcinoma
