MDCB Formulas + Memorization questions with verified
answers
"high radiation area" sign Ans✓✓✓ possible dose >100mrem/hr (1 Sv)
"radiation area" sign Ans✓✓✓ possible dose >5mrem/hr or >100mrem
in 5 consecutive days
"very high radiation area" sign Ans✓✓✓ possible dose >500mrem/hr
(5 Sv)
% bremsstrahlung contamination of electron beams per energy (4 MeV,
10 MeV, 20 MeV) Ans✓✓✓ 4 MeV: <1% contamination
10 MeV: <2.5% contamination
20 MeV: <4% contamination
%/cm attenuation for 20 MV Ans✓✓✓ 2.0% per cm
%/cm attenuation for 6 MV Ans✓✓✓ 3.5% per cm
%/cm attenuation for Co-60 Ans✓✓✓ 4.0% per cm
∼ α/β for early/acute effects Ans✓✓✓ 10 Gy
,∼ α/β for late effects Ans✓✓✓ 3 Gy (1-5 Gy)
∼ α/β for tumors Ans✓✓✓ 10 Gy
1 amu = ? MeV Ans✓✓✓ 931 MeV
1 cGy = ? rad Ans✓✓✓ 1
1 Ci = ? Bq Ans✓✓✓ 3.7 x 10¹⁰
1 Ci = ? dps Ans✓✓✓ 3.7 x 10¹⁰
1 dps = ? Bq Ans✓✓✓ 1
1 Gy = ? rad Ans✓✓✓ 100
1 R = ? rad Ans✓✓✓ 1
1 Sv = ? rem Ans✓✓✓ 100
10 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 2.5 cm, 73%
, 12E: Surface dose (%), dmax, max range Ans✓✓✓ 85%, 2.8cm, 6.0cm
15 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 3.0 cm, 77%
15E: Surface dose (%), dmax, max range Ans✓✓✓ 90%, 2.8cm, 7.6cm
18 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 3.5 cm, 80%
18E: Surface dose (%), dmax, max range Ans✓✓✓ 93%, 2.2cm, 9.2cm
22E: Surface dose (%), dmax, max range Ans✓✓✓ 93%, 2.2cm, 11.1cm
25 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 4.0 cm, 83%
4 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 1.0 cm, 61%
6 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 1.5 cm, 67%
6E: Surface dose (%), dmax, max range Ans✓✓✓ 75%, 1.4cm, 3.0cm
9E: Surface dose (%), dmax, max range Ans✓✓✓ 80%, 2.0cm, 4.4cm
answers
"high radiation area" sign Ans✓✓✓ possible dose >100mrem/hr (1 Sv)
"radiation area" sign Ans✓✓✓ possible dose >5mrem/hr or >100mrem
in 5 consecutive days
"very high radiation area" sign Ans✓✓✓ possible dose >500mrem/hr
(5 Sv)
% bremsstrahlung contamination of electron beams per energy (4 MeV,
10 MeV, 20 MeV) Ans✓✓✓ 4 MeV: <1% contamination
10 MeV: <2.5% contamination
20 MeV: <4% contamination
%/cm attenuation for 20 MV Ans✓✓✓ 2.0% per cm
%/cm attenuation for 6 MV Ans✓✓✓ 3.5% per cm
%/cm attenuation for Co-60 Ans✓✓✓ 4.0% per cm
∼ α/β for early/acute effects Ans✓✓✓ 10 Gy
,∼ α/β for late effects Ans✓✓✓ 3 Gy (1-5 Gy)
∼ α/β for tumors Ans✓✓✓ 10 Gy
1 amu = ? MeV Ans✓✓✓ 931 MeV
1 cGy = ? rad Ans✓✓✓ 1
1 Ci = ? Bq Ans✓✓✓ 3.7 x 10¹⁰
1 Ci = ? dps Ans✓✓✓ 3.7 x 10¹⁰
1 dps = ? Bq Ans✓✓✓ 1
1 Gy = ? rad Ans✓✓✓ 100
1 R = ? rad Ans✓✓✓ 1
1 Sv = ? rem Ans✓✓✓ 100
10 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 2.5 cm, 73%
, 12E: Surface dose (%), dmax, max range Ans✓✓✓ 85%, 2.8cm, 6.0cm
15 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 3.0 cm, 77%
15E: Surface dose (%), dmax, max range Ans✓✓✓ 90%, 2.8cm, 7.6cm
18 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 3.5 cm, 80%
18E: Surface dose (%), dmax, max range Ans✓✓✓ 93%, 2.2cm, 9.2cm
22E: Surface dose (%), dmax, max range Ans✓✓✓ 93%, 2.2cm, 11.1cm
25 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 4.0 cm, 83%
4 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 1.0 cm, 61%
6 MV dmax and PDD at 10 cm ref depth Ans✓✓✓ 1.5 cm, 67%
6E: Surface dose (%), dmax, max range Ans✓✓✓ 75%, 1.4cm, 3.0cm
9E: Surface dose (%), dmax, max range Ans✓✓✓ 80%, 2.0cm, 4.4cm
