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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Student's Guide
CALCIUM-45 (Ca-45)
Calcium-45 is a low-energy beta emitter and may be detected with a thin-window probe. Calcium-45 is
commonly used with animal studies.
1.
Maximum beta energies: 0.257 MeV (the average energy is 0.086 MeV).
2.
Maximum range in air: 20 inches (52 cm).
3.
Maximum range in tissue: 0.62mm.
4.
IAEA toxicity classification: High.
5.
Physical half-life: 163 days.
6.
Effective half-life (Teff): 163 days.
7.
Critical organ: Bone.
8.
Personnel monitoring: Bioassay, initially by urine, later by feces. NOT detected with a
dosimeter (thermoluminescent dosimeter or film).
ALI:
9.
0.8 mCi (3 x 107 Bq) by inhalation.
o
2 mCi (7 x 107 Bq) by ingestion.
o
10.
Shielding: 3mm of plexiglass.
11.
Special Considerations:
Detection of Ca-45 by radiation survey instruments requires special care due to the low
efficiency of detection.
A-13
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