ISO 6980-2:2023
Nuclear energy — Reference beta-particle radiation — Part 2: Calibration fundamentals related to basic quantities characterizing the radiation field
Nuclear energy — Reference beta-particle radiation — Part 2: Calibration fundamentals related to basic quantities characterizing the radiation field
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 42
- Дата публикации:
- 22 ноября 2023 г.
- Издание:
- ISO IS 6980 edition 3 version 1
- ICS:
- 17.240
This document specifies methods for the measurement of the absorbed-dose rate in a tissue-equivalent slab phantom in the ISO 6980 reference beta-particle radiation fields. The energy range of the beta-particle-emitting isotopes covered by these reference radiations is 0,22 MeV to 3,6 MeV maximum beta energy corresponding to 0,07 MeV to 1,2 MeV mean beta energy. Radiation energies outside this range are beyond the scope of this document. While measurements in a reference geometry (depth of 0,07 mm or 3 mm at perpendicular incidence in a tissue‑equivalent slab phantom) with an extrapolation chamber used as primary standard are dealt with in detail, the use of other measurement systems and measurements in other geometries are also described, although in less detail. However, as noted in ICRU 56, the ambient dose equivalent, H*(10), used for area monitoring, and the personal dose equivalent, Hp(10), as used for individual monitoring, of strongly penetrating radiation, are not appropriate quantities for any beta radiation, even that which penetrates 10 mm of tissue (Emax > 2 MeV). This document is intended for those organizations wishing to establish primary dosimetry capabilities for beta particles and serves as a guide to the performance of dosimetry with an extrapolation chamber used as primary standard for beta‑particle dosimetry in other fields. Guidance is also provided on the statement of measurement uncertainties.
Abstract
Overview
ISO 6980-2:2023 - "Nuclear energy - Reference beta-particle radiation - Part 2" defines calibration fundamentals for beta‑particle dosimetry. The standard specifies methods to measure the absorbed‑dose rate in a tissue‑equivalent slab phantom for ISO 6980 reference beta fields. It covers beta-emitting reference radiations with maximum beta energies from 0.22 MeV to 3.6 MeV (mean energies ≈ 0.07 MeV to 1.2 MeV). The document is intended for organizations establishing primary dosimetry capabilities and for laboratories using an extrapolation chamber as the primary standard.
Key topics and technical requirements
- Reference geometry and depths: Measurements are defined for tissue depths of 0.07 mm and optionally 3 mm (perpendicular incidence) in a slab phantom.
- Primary standard: Detailed procedures for calibration using an extrapolation chamber (variable-volume ionization chamber) as the primary measurement device.
- Alternative systems: Guidance on using other ionization chambers and measurement systems, with less detailed treatment than for extrapolation chambers.
- Energy range limitation: Radiation energies outside the stated range are beyond scope; operational quantities for strongly penetrating beta radiation (e.g., H*(10), Hp(10)) are not appropriate for beta fields (ICRU 56).
- Field characterization: Methods to characterize beta fields in terms of penetrability, transmission functions, and scaling to equivalent material thicknesses.
- Calibration and traceability: Requirements for establishing calibration chains and traceability of reference radiation fields.
- Measurement uncertainties: Guidance and an example uncertainty analysis to support accurate statement of measurement uncertainty.
- Supplementary topics: Calibration with ionization chambers, non‑perpendicular incidence measurements, and correction factors for extrapolation chambers are included in informative annexes.
Practical applications and who uses ISO 6980-2:2023
- National metrology institutes (NMIs) establishing or maintaining primary beta-particle dosimetry standards.
- Calibration laboratories performing reference-field calibrations of dosemeters and dose-rate meters for radiation protection.
- Radiation protection services and regulatory laboratories that require traceable beta dosimetry results.
- Manufacturers of dosimetry instruments validating device response to beta radiation.
- Research and applied nuclear facilities (including some areas in medical physics and industry) that require accurate absorbed‑dose measurements in beta fields.
Using ISO 6980-2:2023 supports reliable, traceable beta‑particle calibrations, consistent reporting of absorbed‑dose rates, and robust uncertainty evaluation - essential for compliance, instrument performance, and worker/public protection.
Related standards
- ISO 6980-1 - Reference beta-particle radiation: production and characterization
- ISO 6980-3 - Calibration of dosemeters and dose‑rate meters in reference beta fields
- ISO 29661 - Reference radiation fields for radiation protection - definitions and concepts
- ISO/IEC Guide 99 - International vocabulary of metrology (VIM)
Технические детали
- Технический комитет
- ISO/TC 85/SC 2 - Radiological protection
- SKU
- ISO 6980-2:2023
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