MDCB Formulas – Verified Formula Sheet and Memorization Guide for Dosimetry Exam Prep

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