(CA-45) - Physical Data
Pure Beta Emitter:
- Beta Energy
- 258 keV (max.)
- 77.2 keV (avg.)
- Radioactive Half-Life
- 162.61 days
- Effective Half-Life
- 162 days
- Biological Half-Life
- 1.8 x 104 days
- Max. beta range in air
- 47.91 cm
- Approximately 50% transmission rate through dead layer of skin
Radiological Data:
- Critical organ: bone
- Internal exposure through ingestion, inhalation, or absorption are primary concerns
- Dose rate to the basal cells from skin contamination is approx. 2850 mr/hr µCi per cm2
Shielding:
- None required
Survey Instrumentation:
- Liquid Scintillation Counter (LSC)
- LS window: 0 to 750
- LS efficiency: 100%
- Geiger - Mueller counter (efficiency low)
Regulatory Compliance:
- ALI
- 2000 µCi: (by ingestion)
- 8000 µCi: (by inhalation)
- DAC
- 4 x 10 -7 µCi/mL
Special Considerations:
In general, Calcium-45 does not require any special precautions over and above those necessary for any beta-emitting radionuclide of this energy of emissions. The majority of Calcium-45 is deposited in the bone and is retained with a long biological half-life.