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Phosphorus-33

Physical Data:

  • Beta Energy
 249 keV (max.)
85 keV (avg.)
  • Radioactive Half Life
  • Biological Half Life
  • Effective Half Life
  • Fraction transmitted through dead layer of skin - 51%
 25.4 days
19 days
24.9 days
 

Radiological Data:

  • Critical organ:  bone marrow (30%), total body tissues (70%)
  • Internal exposure is primary concern
  • Dose rate to basal cells from skin contamination - 3270 mr/hr per µCi per cm2

Shielding:

  • 32 mm of lucite (plexiglass) for stock solutions

Survey Instrumentation:

  • Thin window G-m survey meter
  • Liquid Scintillation Counter (LSC)
    • LS window:  0 to 750
    • LS efficiency:  100%

Regulatory Compliance:

  • ALI
 4000 µCi: (by ingestion)
6000 µCi:  (by inhalation)
  • DAC
 3 x 10 -6 µCi/mL

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