Decay in storage
Solid radioactive waste with half lives less than or equal to 120 days can be disposed as ordinary trash under the following conditions:
- The waste must be held in storage until the radiation exposure rate cannot be distinguished from background radiation levels.
- The waste must be monitored at the container’s surface and with no interposed shielding.
- The waste must be monitored with an appropriate radiation detection instrument set at its most sensitive scale.
- The licensee must obliterate or remove all radiation labels.
- The Record of Disposal form must be complete and maintained at least 3 years.
As a general rule, the contents of the container should be allowed to decay for at least 10 half-lives of the longest-lived radioisotope in the container. The container should be sealed, properly shielded, and labeled with the date sealed, isotopes present, the date when 10 half-lives have transpired, and the individual who sealed the container.
Page last modified May 19, 2011