HJ 1127-2020 in English

VALID

Technical Specifications on Determination of Gamma-ray Emitting Radionuclides in Environmental Samples for Emergency Monitoring

Issued on:2020-04-09
Implemented on:2020-04-30
File Format:PDF
Delivery:Via email within 5 business days

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Standard No:	HJ 1127-2020
Document status:	VALID
Title in English:	Technical Specifications on Determination of Gamma-ray Emitting Radionuclides in Environmental Samples for Emergency Monitoring
Title in Chinese:	应急监测中环境样品 γ 核素测量技术规范
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2020-04-09
Implemented on:	2020-04-30
Professional Classification:	HJ-Environment
Related Keywords:	environmental samples biological samples sample processing aerosol samples nuclear accident emergency monitoring emergency monitoring introduction analysis
Related Topics:	nuclide Emergency monitoring environmental monitor Environmental samples Water gamma nuclide standard Environmental samples Determination of benzene sampling in the environment Frontiers of Environmental Monitoring Frontiers of Environmental Monitoring Sample Testing Technology Environmental samples Tested sample Environmental emergency detection box sample discription Ambient Air Emergency Monitor Environmental emergency detection box How to detect nuclides Monitor the environment Sample chamber environment Emergency monitoring box Environmental monitoring disc Environmental monitoring disc elements in liquid samples Environmental test samples Sample weighing Sample technical specification Sample weighing ring sample Tested sample Neutron nuclides Environmental monitoring and measurement Environmental monitoring and measurement Application testing samples sample discription type sample sample curve Physical environment monitoring 40 years of environmental monitoring Sample environment Sample environment Monitor the environment test sample environmental monitor Emergency monitoring Environmental Aerial Monitoring Whole ring sample Environmental emergency detection Environmental Monitor Application Metrology and Environmental Monitoring Nuclide properties Environmental emergency detection Environmental monitoring duplicate sample sample measurement Emergency Monitoring Techniques and Methods Modern Environmental Monitoring Technology Ambient gas sample The main technology of water environment monitoring Environmental monitoring instrument samples Environmental monitoring box Quantitative loop sample Environmental samples Thorium Construction environment acceptance\|indoor environment testing\|environmental protection product monitoring\|environmental quality monitoring\|vehicle exhaust monitoring "Technical Regulations for Radionuclide Monitoring in the Marine Environment" HY/T 235-2018 Nine inaccuracies in environmental monitoring Riboflavin in a reducing environment Sulfuric acid mist monitoring method in emergency monitoring Environmental Monitoring Instrument Technology Environmental quantity monitoring methods

本标准规定了核与辐射事故应急情况下，环境样品 γ 核素的测量技术。
本标准适用于应急监测中，使用实验室高纯锗 γ 能谱仪测量环境介质中 γ 核素，其他测量手段也可参照本标准。

Introduction

Analysis of the core content of the standard

This standard establishes for the first time a complete technical system for the measurement of γ nuclides in environmental samples for nuclear accident emergency monitoring in my country, focusing on the application requirements of high-purity germanium γ spectrometers. The efficiency calibration database provided in Appendix A covers 4 types of P-type (40-70%) and 5 types of N-type (30-70%) detectors, including Monte Carlo simulation efficiency curves for soil, water, biological and other media.

Comparison of Technical Requirements of Key Instruments

Parameters	P-type detector	N-type detector
Energy response range	Above 50 keV	Above 20 keV
Relative detection efficiency	≥20%	≥20%
Energy resolution (⁶⁰Co 1332.5 keV)	≤2.5 keV

Special requirements for sample processing

Aerosol samples: Ultra-large flow (φ70×15 mm) need to be pressed into a cake shape, and large flow (φ50×6 mm) needs to be folded
Biological samples: Leafy vegetables need to be chopped into 1 cm segments and compacted when measured using the 2L Marin cup (Appendix F)
Contaminated samples: The detector must be wrapped with plastic film and a background check must be performed immediately after measurement

Innovations in quality control

The standard proposes a quality control indicator of double sample error ratio (DER) ≤3.0, and requires at least one retest for every 20 samples. Quantitative control is achieved through the formula: DER = |AC_original-AC_dup|/√(u_c²+u_c²).

Application of Nuclide Identification Database

The fission product master nuclide library established in Appendix E contains 77 key nuclides, which are divided into the following categories according to their half-lives:

Early stage of accident (<24h): short-lived nuclides such as ¹³²I and ¹³⁵I
Middle stage (1-10d): ¹³¹I and ¹⁴⁰Ba
Late stage (>30d): long-lived nuclides such as ¹³⁷Cs and ⁹⁰Sr

Implementation Suggestions

Suggested laboratories:

Pre-establishment of efficiency calibration database for different detector types
Regular update of nuclide library (refer to ASTM D7784-12 standard)
Special verification of Marin Cup measurement geometry (Appendix F)

More samples: JC/T 2453-2018 QC/T 942-2021 JGJ 94-2008

Sample only — not a preview of HJ 1127-2020

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