GB/T 12162.2-2025 Active National standards

GB/T 12162.2-2025 X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy—Part 2:Dosimetry for radiation protection over the energy ranges from 8 keV to 1.3 MeV and 4 MeV to 9 MeV

Publish Date: 2025-10-31 Implement Date: 2026-05-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 12162.2-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Exploration, mining, and process monitoring nuclear instruments

ICS Name: Radiation measurement

Publish Date: 2025-10-31

Implement Date: 2026-05-01

Pages: 32 pages

Scope

This document describes the X and γ reference radiation dose measurement procedures for calibrating radiation protection instruments with an energy range of approximately 8 keV to 1.3 MeV and 4 MeV to 9 MeV, and an air kerma rate higher than 1 μGy/h.
This document is applicable to the measurement of air kerma Ka and operational quantities H*(10), Hp(10), H′(3), Hp(3), H′(0.07), and Hp(0.07) in free air.
The requirements and methods presented in this document aim to ensure that the expanded uncertainty (k=2) of the reference field to the phantom-related operational quantities (rates) is approximately 6% to 10%. For this purpose, two methods for generating reference fields are provided in ISO 4037-1.
The first method strictly follows the requirements for generating a "matched reference field", which can directly use the recommended conversion coefficients. Through the procedures presented and described in detail in this document, the slight energy spectrum differences between the matched reference field and the nominal reference field are verified. For matched reference radiation fields, ISO 4037-3 only provides recommended conversion coefficients for specified distances between the source and the dosimeter (e.g., 1.0 m and 2.5 m). For other distances, users need to determine whether these conversion coefficients can be used.
The second method generates a "characterized reference field", which can either determine the conversion coefficients by energy spectrometry or directly measure the required quantities using secondary standard dosimeters. This method is applicable to any radiation quality and measurement quantities, as well as any applicable phantoms and any radiation incidence angles. It can determine conversion coefficients at any distance with an air kerma rate of no less than 1 μGy/h.