Radioactive Materials Safety Training. Massachusetts Institute of Technology Radiation Protection Program William B. McCarthy, Ph.D., CHP email@example.com x3-0346. Outline. Introduction Delegation of Authority Radiation Physics Units and Quantities
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Massachusetts Institute of Technology
Radiation Protection Program
William B. McCarthy, Ph.D., CHP
mCi and uCi are common quantities used in the lab (10 uCi up to 50 mCi).
0.0013 uCi (48 Bq) - Ra-226 in a 1 kg rock
0.12 uCi (4400 Bq) - K-40 in your body
330 pCi - C-14 in ¼ lb of beef
Absorbed Dose rad: Amount of Energy deposited per unit mass of material. 1Gy = 100 rad.
Dose Equivalentrem: Risk adjusted absorbed dose. The absorbed dose is weighted by the radiation type and tissue susceptibility to biological damage. 1 Sv = 100 rem.
Radiation weighting factors: alpha(20), beta(1), n(10).
Tissue weighting factors: lung(0.12), thyroid(0.03), and gonads(0.25).
For whole body x or gamma-ray exposure 1 R 1 rad 1 remDefinitions
Low energy gamma or x-ray
High energy gamma or x-ray
0.03 mR/hr or 100 cpm
GM pancake probe
Source: BEIR V Report, 1990
* Declared Pregnant Woman
P-32 - 6.5 rad/hr/uCi
S-35 - 2.5 rad/hr/uCi