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GB/T 44632-2024Reference radiation fields for radiation protection - Definitions and fundamental concepts (English PDF)

辐射防护用参考辐射场定义和基本概念

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

September 29, 2024

Implementation date

October 1, 2025

Scope

GB/T 44632-2024 is the English-translated version of 辐射防护用参考辐射场定义和基本概念.

GB/T 44632-2024 — This document defines terminology related to the calibration of dosimeters and equipment used for dose measurement of external radiation, particularly beta, neutron and photon radiation.

The basic concepts and measurements of radiation protection dosimeters and dose (rate) meters are clarified. For personal dose monitoring, including torso (whole body) dose for site dose monitoring, it includes portable and fixed dose (rate) meters.

This document specifies the calibration requirements, calibration process, and calibration procedures for dosimeters and dose (rate) meters used for personal and site dose monitoring in reference radiation fields.

The requirements for the reference points and phantom placement of personal dosimeters during the process, as well as the methods for determining the energy response and angular response, are discussed.

This document is intended for reference by calibration laboratories and manufacturers.

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Document preview — GB/T 44632-2024

National Standard of the People's Republic of China

ICS: 13.280
Classification: F 85

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
1 Scope
2 Normative references
3 Terms and Definitions
3.1 General
3.2 Quantities and conversion factors
4 Symbol
5 Application of measurement quantities and units
5.1 Measurement quantities for site monitoring
5.2 Quantities for personal monitoring
5.3 Determination of measurement quantities for site and individual monitoring
6 Calibration and determination of response in the reference radiation field
6.1 General Principles
6.1.1 Parts to be irradiated
6.1.2 Test conditions for dose (rate) meters
6.1.3 Determination of inspection points and reference points
6.1.4 Determination of the axis of rotation
6.1.5 Reference conditions and standard test conditions for influencing quantities
6.2 Calibration in the reference radiation field
6.2.1 Calibration process
6.2.2 Using secondary standards or working measurement standards to determine agreed quantities
6.2.3 Determination of correction indication and calibration factor
6.2.4 Determination of measured values
6.3 Determination of the reference radiation field response
6.4 Determination of calibration coefficients
6.4.1 Procedure
6.4.2 Sequential irradiation standards and dose (rate) meters
6.4.3 Simultaneous irradiation standards and dose (rate) meters
6.4.4 Calibration and determination of response using calibrated monitoring devices
6.4.5 Calibration and determination of response using reference radiation sources
6.5 Special requirements for site dose (rate) meters (site inspection meters)
6.5.1 Reference point and reference direction
6.5.2 Irradiation conditions
6.6 Special requirements for personal dosimeters
6.6.1 Overview
6.6.2 Phantom
6.6.3 Reference direction and reference point
6.6.4 Irradiation conditions
6.6.5 Simultaneous exposure of multiple dosimeters
7 Uncertainty
8 Certificate
Appendix A (Normative) Reference conditions and standard test conditions list
Appendix B (Normative) Calibration Factor Description
Reference

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is equivalent to ISO 29661:2012 "Definitions and basic concepts of reference radiation fields for radiation protection".

The following minimal editorial changes were made to this document.

--- The outer margins of clauses involved in the contents of ISO 29661:2012/Amd.1.2015 are marked with double vertical lines (||) Marked;

--- Corrected the errors in the original text and modified the units of the symbols d, E and hPhi (see Chapter 4);

---Added personal doses for different types of radiation (photons, beta and neutrons) under different conditions such as measurement, calibration and type testing Description of the reference point for calculation (see 6.6.3).

1 Scope

This document defines terminology related to the calibration of dosimeters and equipment used for dose measurement of external radiation, particularly beta, neutron and photon radiation.

This document is intended for reference by calibration laboratories and manufacturers.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 27025-2019 General requirements for testing and calibration laboratories (ISO/IEC 17025:2017, IDT) ISO/IEC Guide 98-3 Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement Note. GB/T 27418-2017 Evaluation and Expression of Uncertainty in Measurement (ISO/IEC Guide 98-3..2008, MOD)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 General

3.1.1

In the coordinate system of the dose (rate) meter, the angle between the incident direction of radiation in the azimuth field and the reference direction of the dose (rate) meter.

3.1.2

Areadose meter

Area Survey Meter

An instrument used to measure ambient dose equivalent (rate) or directional dose equivalent (rate).

3.1.3

Background indication an indication obtained from a phenomenon, object or substance similar to the one being studied, but in which the quantity of interest is not represented or does not contribute to the result.

3.1.4

Calibration

A set of operations under specified conditions, the first step of which is to determine the relationship between the value provided by the measurement standard and the corresponding indication.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 25 pages — is available in the English PDF.

Referenced standards

Normative references

ISO/IEC 17025

Cited by

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