49 Radioactive Materials Safety Manual 33P PHOSPHORUS-33 Half - Life Physical Biological Effective 25.4 days 1,157 days (bone) 24.9 days (bone) Radiation Emitted Type Energy (max) Range (max) Beta 249 keV Air: 48 cm Tissue: .6mm External Hazard As a skin contaminant only Internal Hazard Effective Committed Dose Ingestion Inhalation Equivalent per Unit Intake: 0.9 mrem/µCi (2.48 x 10-10 Sv/Bq) 0.6 mrem/µCi (1.71 x 10-10 Sv/Bq) Annual Limit on Intake: (ALI)* 6 mCi 8 mCi *ALIs expressed are from Appendix B, Table 1 – Iowa Administrative Code 641.40 (136C). Special Considerations • None Radiation Safety Practices • Dosimetry – None • Bioassay – Required for individuals involved in spills or other incidents where significant uptake is suspected. • Shielding – None • Surveys – Wipes analyzed in LSC or GM meter surveys.
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