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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Instructor's Guide
Instructor's Notes
CHROMIUM-51 (Cr-51)
Chromium-51 is a gamma and a X-ray emitter. Cr-51 is readily
detected with a thin-window G-M probe. Liquid scintillation
counting is also used.
1.
Maximum energy: 0.32 MeV gamma ray (9.8%), a
very low energy (0.005 MeV) X-ray (22 %) and
0.004 MeV (66.9%) auger electron.
2.
IAEA toxicity classification: Medium-low.
Physical half-life: 27.7 days.
3.
Effective biological half-life: 27 days.
4.
Critical organ: Lower large intestine, and lungs.
5.
Personnel monitoring: Dosimeter, internal uptakes
6.
may be determined by urine or fecal sampling.
7.
ALI:
20 mCi (7 x 108 Bq) by inhalation, yearly
o
clearance.
20 mCi (7 x 108 Bq) by ingestion.
o
Shielding - 3.2 mm of lead is the half value layer
8.
(thickness of lead that will reduce the dose rate by
one-half).
9.
Special Considerations:
Use thin-end window G-M or solid scintillation
detectors or liquid scintillation counting.
A-20
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