Skip to main content
Disclaimer: This software is for radiation protection education, screening calculations, and professional support only. It does not replace qualified health physicist judgment, regulatory requirements, approved procedures, emergency response tools, or formal shielding design review. Exposure, absorbed dose, equivalent dose, and effective dose are distinct quantities; do not equate R and Sv without explicit context and assumptions.

Waste / decay-in-storage help

Planning and documentation scope

This module provides radioactive waste planning and decay-in-storage documentation support only. It does not authorize disposal, release, sewer disposal, decay-in-storage clearance, or regulatory compliance decisions. Follow license conditions, approved procedures, survey requirements, and qualified RSO/health physicist review.

Open the workspace at /calculators/waste. Hash fragments #decay-storage, #ten-half-lives, #container-inventory, and #disposal-checklist select each card.

What each tool does

  • Decay-in-storage: single-nuclide exponential decay for remaining activity; optional analytic time to reach a target activity (same unit as initial) or target fraction of initial. Bundled half-life only.
  • Ten half-lives: fixed elapsed time of ten half-lives; shows approximate fraction remaining (~2−10) with explicit non-authorization language.
  • Container inventory: line items with reference activity and elapsed time; current activity per line and sums by radionuclide (Bq). Labels only—does not replace inventory systems.
  • Survey-before-disposal checklist: checkbox documentation for common survey workflow reminders; no scoring or pass/fail.

Exports

JSON, Markdown, and plain-text copy require a non-empty waste stream / source note on decay-in-storage, ten half-lives, and container-inventory tabs. The checklist tab does not require that note. See /help/reports for general export behavior.

References

Report payloads may list pointers to 10 CFR Part 20, 10 CFR Part 35 (medical context), NRC waste program pages, and an internal HPCalc screening note. Numeric disposal or clearance limits are not embedded in the app.