WS/T 668-2019 in English

VALID

Requirements for radiological protection for radon in public underground structure and using geothermal water

Issued on:2019-09-27
Implemented on:2020-04-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
$156.00

Standard No:	WS/T 668-2019
Document status:	VALID
Title in English:	Requirements for radiological protection for radon in public underground structure and using geothermal water
Title in Chinese:	公共地下建筑及地热水应用中氡的放射防护要求
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2019-09-27
Implemented on:	2020-04-01
Superseding:	GBZ 116-2002 Standard for controlling radon and its progenies in underground space GBZ 124-2002 Radiological protection standards for using geothermal water
ICS Classification:	13.280-Radiation protection
Chinese Classification:	C57-Radiological sanitation protection
Professional Classification:	WS-Hygiene
Related Keywords:	public underground structure cumulative measurement method refining control requirements geothermal water site geothermal water introduction analysis geothermal water
Related Topics:	protection requirements radon radiation groundwater Radon value requirements radon playback Benzene in groundwater Radon detection in groundwater The first type of construction land underground building radon There are mandatory requirements for radioactivity indicators in water Radon concentration in water Radon content in groundwater

本标准规定了公共地下建筑内、地热水（包括温泉水）开发和利用场所中有关氡（222Rn）的测量和控制要求。
本标准适用于地下建筑、地热水的开发和利用场所的公众防护要求。

Introduction

Analysis of the core content of the standard

This standard integrates and replaces the two old regulations GBZ 116-2002 and GBZ 124-2002. The main technical changes include: deleting the radon concentration control clause in geothermal water, adjusting the control level numerical system, and adding a systematic measurement scheme. It is applicable to underground shopping malls, subway stations, hot spring hotels and other underground buildings and geothermal water application places.

Comparison of key control indicators

Site type	Reference level (Bq/m³)	Intervention threshold (Bq/m³)	Emergency threshold (Bq/m³)
Underground buildings	400	400-1000	>1000
Geothermal water site	800	800-1000	>1000

Measurement Technical Specifications

Graded Measurement System

A two-stage plan of screening measurement → follow-up measurement is adopted:

Screening measurement: rapid initial screening (2-7 days)
Follow-up measurement: confirmatory measurement (90 days-1 year)

Point layout principles

Determine the number of detection points according to the area:

＜100㎡: 2-3 points
100-500㎡: 3-5 points
＞500㎡: ≥5 points

Implementation Recommendations

Preventive Measures for New Construction Projects

Geological surveys should be carried out when selecting sites to avoid areas with high radium content; priority should be given to sites that meet GB 6566 low-radioactive building materials; underground space design should reserve ventilation shafts.

Correction plan for existing sites

Take step-by-step measures according to the degree of exceeding the standard:

400-1000Bq/m³: Strengthen mechanical ventilation within 6 months
＞1000Bq/m³: Start source shielding within 3 months
Continuous exceeding the standard: Implement permanent engineering transformation

Standard evolution analysis

This standard refers to the requirements of ICRP Publication 126, changing the control concept from single limit management to reference level + optimized control mode, which is more in line with the development trend of international radiation protection. Compared with the 1996 version of the standard, the main technical breakthroughs are: