50 Radioactive Materials Safety Manual Environmental Health and Safety 35S SULFUR-35 Half - Life Physical Biological Effective 87.4 days 90 days 44.3 days Radiation Emitted Type Energy (max) Range (max) Beta 167 keV Air: 28 cm Tissue: .3mm External Hazard As a skin contaminant only Internal Hazard Effective Committed Dose Ingestion Inhalation Equivalent per Unit Intake: 0.4 mrem/µCi (1.21 x 10-10 Sv/Bq) 0.3 mrem/µCi (8.15 x 10-11 Sv/Bq) Annual Limit on Intake: (ALI)* 10 mCi 20 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
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