Clearance screening

Screen a nuclide inventory against the EU 2013/59/Euratom Annex VII Table A clearance levels with the sum-of-fractions rule.

Material leaving a regulated radiation area can be cleared for reuse or disposal when its activity concentrations are low enough. EU Council Directive 2013/59/Euratom, Annex VII Table A tabulates default activity concentrations (in Bq/g) for solid material, and the screening criterion is the sum-of-fractions rule: add up each nuclide’s activity divided by its table level, and the material passes when the sum is at or below one.

The demo below screens an editable nuclide inventory against the default EU table. It reports the per-nuclide fractions, the sum, the dominant contributor, and whether the screening criterion is satisfied. This is screening arithmetic, not a compliance decision — real clearance requires the governing regulatory table, material bookkeeping, and the national transposition of the directive.

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Radiological totals (S3–S7)

The same activation inventories feed five more pure-arithmetic totals. The committed ingestion and inhalation hazards (S4/S5) fold per-nuclide activities with caller 50-year committed dose coefficients into total doses in Sv, each with an excluding-tritium companion. The transport ratio (S6) folds activities with caller A₂ limits into the dimensionless total Bq/A₂ plus the effective A₂ it defines. The IAEA clearance-index variant (S7) folds activities with caller IAEA levels and the total mass into a dimensionless index screened at ≤ 1. The slab/point gamma dose (S3) folds a specific activity with caller group yields and attenuation coefficients into Sv/h, clamping short point distances loudly at 0.3 m. Every table behind these kernels — dose coefficients, A₂ limits, IAEA levels, attenuation data — stays a caller input and is never vendored. The demo below exercises all five over editable inventories.

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