This standard specifies the control level and monitoring method for radon (222Rn) in the application of geothermal water (including hot spring water). This standard applies to the development and utilization of geothermal water. GB 16367-1996 Radiation Health Protection Standard for Geothermal Water Application GB16367-1996 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Radiological protection standards for using geothermal water1 Subject content and scope of application
GB16367—1996
This standard specifies the control level and monitoring method for hydrogen (2Rn) in the application of geothermal water (including hot spring water). This standard applies to the development and utilization of geothermal water. 2 Reference standards
GB8538.58 Determination of hydrogen in drinking natural mineral water GB/T16147 Scintillation bottle measurement method for Rn concentration in air 3 "Terminology
3.1 Geothermal water
Groundwater extracted from artificial boreholes deep underground or naturally gushing out to the surface. 3.2 Hydrogen spring bath Radon spring bath
Use geothermal water or hot spring water with a hydrogen concentration greater than 110kBq·m-3 for therapeutic bathing. 4
Control level
For geothermal water used for drinking and living in residences, the control level of hydrogen concentration in the water is 50kBq·m-3. For geothermal water used for production in factory workshops, the control level of hydrogen concentration in the water is 100kBq·m-3. When the hydrogen concentration in medical geothermal water exceeds 300kBq·m~3, medical personnel entering the bathing room should take corresponding protective measures. In all practices related to the application of geothermal water, the control levels of hydrogen and hydrogen progeny in the air in different places are listed in Table 1: Table 1 Control levels of hydrogen and hydrogen progeny in the air in different places Application place
Residential and workshop
Balami
Monitoring method
Equilibrium equivalent hydrogen concentration
ECr,Bq · m-3
5.1 Regularly measure the concentration of hydrogen in water and hydrogen and hydrogen progeny in air at various places. 5.2 The monitoring method of hydrogen in air is shown in GB/T16147. 5.3 The monitoring method of hydrogen in water is shown in GB8538.58, and Appendix A (reference) can also be used. The State Technical Supervision Bureau approved hydrogen progeny on May 23, 1996.
10-{J·m-3
1996-12-01 implementation
Radiation hygiene requirements for oxygen spring baths
GB 163671996
The hot spring bath can only be implemented with a prescription from an experienced physiotherapist. 6.2 Healthy people should not be treated with cyanide hot spring baths. Children and pregnant women should be treated with caution with oxygen hot spring baths. 6.3 Medical personnel entering the hydrogen hot spring bath treatment room should adopt simple and feasible radiation protection measures, such as strengthening ventilation, controlling working hours, and equipping with personal protective equipment.
A1 Method Summary
GB163671996
Appendix A
Rapid Determination Method of 222Rn in Water
(Reference)| |tt||Scintillation radiator method
Take 100mL of water sample, seal it in a diffuser, use an electric degassing pump to transfer 222Rn in the water to the scintillation chamber, and strictly follow the procedures of degassing, waiting, and measuring to complete the test process. Use the value after the instrument is scaled to calculate the concentration of 222Rn in the water. A2
Instruments and equipment
A2.1 Scintillation hydrogen meter.
A2.2 Cylindrical scintillation chamber, volume 250mL. A2.3 Electric degassing pump.
A2.4 Organic glass sampler (diffuser) with volume scale. A2.5 Drying tube with a volume of 4mL, equipped with color-changing silica gel for drying and a two-layer ultra-fiber filter membrane. A2.6 Measurement system pipeline, volume 30mL. A3 Test steps
A3.1 Sampling: Use a sampler with a volume scale, correctly take 100mL of water sample, then seal and immediately connect to the measurement system (see figure), open the inlet and outlet pistons to connect to the scintillation chamber in the instrument, start the electric degassing pump, force the air to blow for 3 minutes to dry and remove the hydrogen daughters of 222Rn in the water sample and transfer it to the scintillation chamber that has been cleaned with aged air beforehand. A3.2 Determination: Blow 22Rn into the scintillation chamber and wait for 5 minutes, then connect the LCD digital recorder and measure for 10 minutes (5th to 15th minute) under the same conditions as when the instrument was calibrated (decay time, pipeline volume, measurement time correction), and calculate the concentration of 222Rn in the water by net counting. Determination system diagram
1--scintillation cyanide analyzer; 2-electric degassing pump, 3-sampler (diffuser), 4-drying tube, 5-scintillation chamber; A~H-valve A4 Calculation of 22Rn concentration in water
A4.1 The activity of 22Rn for calibration is calculated by formula (A1). CRn = Qra(l — e-\)
. (A1)bzxZ.net
Where: Cn standard—
Activity of 222Rn for calibration, Bq;
GB16367—1996
QRa——Activity of liquid 226Ra source for calibration, Bq; 222Rn decay constant, d-;
t-- 22Rn accumulation time, d.
Calculation of instrument calibration value K.
Where: K-
CRn scale
Instrument scale value, Bq/cpm;
Activity of 22?Rn generated by liquid 226Ra source, Bq; n scale 222Rn measured net count, cpm; volume correction factor.
A4.3 Calculation of 222Rn content in water.
Where: CRn water
V Yong—
A4.4 Accuracy
Concentration of 222Rn in water sample, Bq/L;
Instrument scale value, Bq/cpm;
K·n water
Net count of water sample measured at specified time, cpm; Total volume of water sample, L.
The difference between the results of two parallel samples should not exceed 20%. Additional Notes:
This standard was proposed by the Ministry of Health of the People's Republic of China. This standard was drafted by the Institute of Radiation Medicine, Chinese Academy of Medical Sciences. The main drafters of this standard are Wang Xiehua and Hao Jun. This standard is interpreted by the Ministry of Health's Industrial Hygiene Laboratory, the technical unit entrusted by the Ministry of Health. 172
·(A2)
(A3)
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