Radioactive Materials Safety Training. Massachusetts Institute of Technology Radiation Protection Program William B. McCarthy, Ph.D., CHP [email protected] x3-0346. Outline. Introduction Delegation of Authority Radiation Physics Units and Quantities
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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