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Calcium-45 (Ca-45)

Physical Data:

  Pure Beta Emitter

  • Beta Energy
 258 keV (max.)
77.2 keV (avg.)
  • Radioactive Half Life
  • Effective Half Life
  • Biological Half Life
  • Max. beta range in air
  • Approximately 50% transmission rate through dead layer of skin
 162.61 days
162 days
1.8 x 104 days
47.91 cm

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 Calicum-45 is deposited in the bone and is retained with a long biological half life.

 

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