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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Instructor's Guide
Instructor's Notes
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).
Maximum range in tissue: 0.62mm.
3.
IAEA toxicity classification: High.
4.
Physical half-life: 163 days.
5.
Effective half-life (Teff): 163 days.
6.
Critical organ: Bone.
7.
Personnel monitoring: Bioassay, initially by urine,
8.
later by feces: NOT detected with a dosimeter (TLD
or film).
9.
ALI:
0.8 mCi (3 x 107 Bq) by inhalation.
o
2 mCi (7 x 107 Bq) by ingestion.
o
Shielding: 3mm of plexiglass.
10.
A-18
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