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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Student's Guide
CHROMIUM-51 (Cr-51)
Chromium-51 is a gamma and an 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.
IAEA toxicity classification: Medium-low.
2.
3.
Physical half-life: 27.7 days.
4.
Effective biological half-life: 27 days.
5.
Critical organ: Lower large intestine and lungs.
6.
Personnel monitoring: Dosimeter, internal uptakes may be determined by urine or fecal
sampling.
ALI:
7.
20 mCi (7 x 108 Bq) by inhalation, yearly clearance.
o
20 mCi (7 x 108 Bq) by ingestion.
o
8.
Shielding - 3.2 mm of lead is the first half value layer (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-14
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