Waste streams & segregation
Ac-225 generates a small number of distinct waste streams. Each has a different typical activity, decay trajectory, and disposal pathway. Segregating at the point of generation — not at the storage room — is what keeps the program manageable.
Primary streams
Sharps
Needles, syringes, vial tops. Highest per-item activity in the program. Rigid puncture-resistant containers, segregated by approximate activity, labeled with generation date and AU. Never co-mingle with soft waste.
Dry / soft waste
Gloves, gowns, absorbents, wipes, dressings. High volume, lower per-item activity. Subdivide by generation point (dose-draw vs post-administration) — dose-draw soft waste typically carries more activity and merits a separate bin.
Liquid waste
Residual eluate, rinse waters, decant from vial prep. Smaller volumes than typical RLT streams but require dedicated, leak-tested containment. Plan sanitary-sewer release only against §20.2003 limits with documented activity per release.
Patient-generated waste
Bedpan / urinal contents, soiled linens, restroom consumables. Handled per the post-administration hold area protocol; usually surveyed and released as soft waste once the patient is discharged.
Segregation rules
Segregate by stream
Sharps vs soft vs liquid — never mix. Dose-draw soft waste separate from post-administration. By generation date for FIFO release.
Do not mix
Ac-225 streams with other isotope streams. High-activity dose-draw with low-activity consumables. Anything bagged today with anything older — break FIFO and you re-survey everything.
If a technologist has to think for more than a couple of seconds about which bin to use, the bin setup is probably the issue. Color-coding, eye-level labels, and putting the survey instrument in the same line of sight as the bins usually helps.
- 10 CFR §20.2001 — General requirements for waste disposal.