Federal regulations mandate the security of radioactive materials. Using a risk-based approach, UCSD has set trigger levels for isotopes that require additional security.
Trigger levels are 100 times the Code of Federal Regulations, Part 20, Appendix C value. The more radiotoxic the isotope, the lower the value. As shipments are received, the EH&S Services Lab will specially label stock vials that require the additional security.
Trigger levels for the 6 most commonly used isotopes are:
| Isotope |
Activity (mCi) |
| H-3 |
100 |
| C-14 |
10 |
| P-33 |
10 |
| S-35 |
10 |
| P-32 |
1 |
| I-125 |
0.1 |
Security: Individual stock vials whose reference activity exceeds the trigger level must be in an area attended by an authorized user, or be stored in a locked container, refrigerator, or laboratory.
Exceptions: This policy applies only to stock vials containing radioactivity greater than these amounts, not to waste or experiments in progress.
Questions or comments? Contact EH&S Radiation Safety, (858) 822-2494.
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