48 Radioactive Materials Safety Manual Environmental Health and Safety Radiation Safety Practices • Dosimetry – Extremity dosimeters, such as ring badges, maybe required when working with 1 mCi (37 mBq) or more. • Bioassay – Required for individuals involved in spills or other incidents where significant uptake is suspected. • Shielding – Plexiglas (1 cm) should be used when working with 1 mCi (37 MBq) or more. Lead may also be required when working with 10 mCi (370 MBq) or more. • Surveys – GM meter surveys or wipes analyzed in an LSC. • General – Bare vials of more than 1 mCi of 32P should not be handled directly unless leaded rubber gloves are worn; shielded containers, tongs, or vial/tube racks should be used for manipulating vials of 32P. • EH&S should be notified immediately of any 32P skin contamination.