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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

Radioactive waste planning and decay-in-storage documentation support only. Physics lives in lib/physics/waste.ts; structured fields use the wasteReport extension on the shared report payload. This release does not perform regulatory disposal or release determinations.

Help: /help/waste · Tab hashes: #decay-storage, #ten-half-lives, #container-inventory, #disposal-checklist

Module 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. Tools use bundled half-lives and exponential decay only—no packaging attenuation, no branching or progeny ingrowth, and no comparison to disposal or release limits in-app.

Data audit & export readiness

Enter valid inputs on this tab to populate the audit snapshot.

Help: /help/waste · Roadmap: waste management

Active: #decay-storage · Decay-in-storage estimator

Decay-in-storage estimator

Remaining activity after storage and optional time-to-target estimates. Single-nuclide exponential decay with bundled half-life.

Radionuclide

Selected: Cs-137

Cs-137γ · β

Brachytherapy (historical)

Catalog id: cs-137

Half-life (bundled row)
30.17 y
Decay modes
β⁻ (Ba-137m), γ
Photon energies (keV)
662
Gamma constant (µSv·m²/MBq·h)
0.08
Gamma constant confidence / provenance
IllustrativeScreening air-kerma-rate style constant (µSv·m²/MBq·h) bundled for training; verify against your approved reference table or measurement certificate.

Default unit follows global SI/traditional preference until you choose a different unit here.

Results

Remaining activity
994354.87 MBq (9.9435487e+11 Bq)
Percent remaining
99.4355%
Half-lives elapsed
0.00816727
Time to target activity
—
Time to target fraction
—

Exports blocked until waste stream note is non-empty.