46 Radioactive Materials Safety Manual Environmental Health and Safety 14C CARBON-14 Half - Life Physical Biological Effective 5,730 years 10 days 10 days Radiation Emitted Type Energy (max) Range (max) Beta 156 keV Air: 24 cm Tissue: 0.28 mm External Hazard As a skin contaminant only Internal Hazard Effective Committed Dose Ingestion Inhalation Equivalent per Unit Intake: 2.1 mrem/µCi (5.64 x 10-10 Sv/Bq) 2.4 x 10-2 mrem/µCi (6.36 x 10-12 Sv/Bq) CO2 Annual Limit on Intake: (ALI)* 2 mCi 200 mCi CO2 * 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 • General – Experimental procedures involving the release of 14C labeled carbon dioxide must be conducted in a fume hood or within a sealed chamber vented to a fume hood.
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