OAR 333-116-0290
Decay-In-Storage
(1)
A licensee may hold radioactive material with a physical half-life of less than 120 days for decay-in-storage before disposal in ordinary trash and is exempt from the requirements of OAR 333-120-0500 (Waste Disposal: General Requirements) of these rules if the licensee:(a)
Holds radioactive material for decay a minimum of 10 half-lives;(b)
Monitors radioactive material at the container surface before disposal as ordinary trash and determines that its radioactivity cannot be distinguished from the background radiation level with an appropriate radiation detection survey instrument for the radiation being monitored, set on its most sensitive scale and with no interposed shielding;(c)
Removes or obliterates all radiation labels, except radiation labels on materials that are within containers and that will be managed as biomedical waste after they have been released from the licensee; and(d)
Separates and monitors each generator column individually with all radiation shielding removed to ensure that its contents have decayed to background radiation level before disposal.(2)
For radioactive material disposed in accordance with these rules the licensee must retain a record of each disposal until inspection by the Authority. The record must include the date of the disposal, the date on which the radioactive material was placed in storage, the model and serial number of the survey instrument used, the background dose rate, the radiation dose rate measured at the surface of each waste container and the name of the individual who performed the survey.(3)
Iodine-125 waste in microcurie amounts may be held for a minimum of five half-lives. Such waste must be surveyed with an appropriate instrument prior to disposal to confirm that waste is indistinguishable from background.
Source:
Rule 333-116-0290 — Decay-In-Storage, https://secure.sos.state.or.us/oard/view.action?ruleNumber=333-116-0290
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