This standard specifies the control principles and standards for radon and its progeny in the air of underground buildings. This standard applies to existing and planned underground buildings. This standard does not apply to unoccupied underground buildings. GBZ 116-2002 Control Standard for Radon and Its Progeny in Underground Buildings GBZ116-2002 Standard download decompression password: www.bzxz.net

Ics13.100
National occupational health standard of the People's Republic of China GBZ116-2002
Standard for controlling radon and its progenies in underground space
Promulgated on April 8, 2002
Ministry of Health of the People's Republic of China
Implementation on June 1, 2002
Normative reference documents
Terms and definitions
Control principles and standards
5 Inspection
Protective measures
Appendix A (informative appendix)
Appendix B (informative appendix)
Simplified table of hydrogen exhaust ventilation rate and instructions for use
Unit conversion relationship
This standard is formulated in accordance with the Occupational Disease Prevention and Control Law of the People's Republic of China. In case of any inconsistency between the original standard GB16356-1996 and this standard, this standard shall prevail.
Sections 4.1.3, 4.1.4, 4.2.1 and 4.2.2 of this standard are mandatory contents, and the rest are recommended contents. Appendix A and Appendix B of this standard are informative appendices. This standard is proposed and managed by the Ministry of Health.
Drafting units of this standard: Liaoning Institute of Labor Hygiene, Institute of Radiation Medicine, Academy of Military Medical Sciences of the Chinese People's Liberation Army, Sichuan Institute of Labor Hygiene and Occupational Disease Prevention and Control, Fourth Design Institute of General Staff Engineering Corps.
Main drafters of this standard: Meng Wenbin, Wang Gongpeng, Qiang Zhiyong, Tian Zhiqian, Zhang Weidao This standard is interpreted by the Ministry of Health of the People's Republic of China. 1 Scope
Control standard for hydrogen and its daughters in underground buildings
GBZ116-2002
This standard specifies the control principles and control standards for hydrogen and its daughters in the air of underground buildings. This standard applies to underground buildings that have been built and are to be built. This standard does not apply to unoccupied underground buildings. 2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revised versions are not applicable to this standard. However, parties reaching an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions apply to this standard.
GB6566 Limits of radioactive nuclides in building materials 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1 Underground space
Any underground construction project or underground place with a certain space built below the ground on purpose is collectively referred to as an underground building.
3.2 Hydrogen and its progenies Hydrogen is a natural radioactive inert gas with three isotopes: 222Rn, 220Rn, and 219Rn. In this standard, hydrogen refers only to 222Rn, and hydrogen daughters refer only to 218Po, 214Pb, 214Bi and 214Po, the short-lived decay products of 222Rn. 3.3 Action level action level
In this standard, the equilibrium equivalent hydrogen concentration in the underground building is pre-specified. When this concentration is exceeded or expected to be exceeded, remedial action is required.
4 Control principles and standards
4.1 Control principles bzxZ.net
4.1.1 In the practical activities of underground building utilization, the natural radiation level will increase, and it is necessary to control the exposure caused by the increase. When carrying out design and construction related to radiation protection, the principles of practice justification, optimization of radiation protection and the provisions of this standard must be followed, and the additional exposure of the public due to inhalation of hydrogen and its daughters in the air in underground buildings must be controlled to the lowest level that can be reasonably achieved in an appropriate manner. 4.1.2 According to the degree of controllability, underground buildings are divided into two situations: used and to be built. Used underground buildings can only be controlled by taking remedial actions: control measures should be taken during the design and construction of underground buildings to be built. 4.1.3 For used underground buildings, when the annual average value of the equilibrium equivalent concentration in the air exceeds the action level in Article 4.2.1, supplementary actions should be taken, including finding out the cause and source of the increase in hydrogen and taking effective and feasible protective measures. 4.1.4 For underground buildings to be built, more reasonable and effective control and protective measures should be adopted in the design and construction so that the average value of the equilibrium equivalent hydrogen concentration meets the limit requirements of Article 4.2.2. 4.2 Control standards
4.2.1 The action level of used underground buildings is 400Bg·m3 (equilibrium equivalent hydrogen concentration). 4.2.2 The design level of underground buildings to be built is 200Bg·m (equilibrium equivalent hydrogen concentration). 5 Inspection
5.1 The concentration of hydrogen and its progeny in underground buildings that have been used and are to be used should be inspected. The inspection should be carried out under the conditions of normal use of the underground buildings, and the frequency of inspection should be determined according to actual conditions. 5.2 The selection of inspection points should take into account the structure, area, purpose, personnel distribution, ventilation and other conditions of the underground building. Protective measures
6.1 Ventilation and hydrogen removal
Appropriate ventilation is an effective measure to remove hydrogen and its progeny from underground buildings. To select a reasonable ventilation frequency, you can refer to the simple table of hydrogen removal ventilation rates, see Appendix A (Normative Appendix). Ventilation should allow fresh air to be directly delivered to the personnel activity area. The wind source should be clean ground air, and the wind flow should be strictly prevented from being polluted.
Control and isolate hydrogen sources
Block or seal all pathways and pores for hydrogen to enter the underground building from the foundation and surrounding soil, and prevent the infiltration of hydrogen-rich groundwater, etc.
6.3 Purify the air and reduce hydrogen progeny
6.4 When it is necessary to work in underground buildings that exceed the action level, the approval of the radiation health authority shall be obtained. 5 When designing and constructing underground buildings, the selected address should avoid areas with high radium content in the soil or rock as much as possible, and choose building materials that comply with GB6566, and take appropriate measures to reduce hydrogen. A1
Appendix A
(Informative Appendix)
Simplified table of hydrogen exhaust ventilation rate and instructions for use
Simplified table of hydrogen exhaust ventilation rate (control standard is 200Bg·m) Enclosed hydrogen
Ventilation rate
times·h'
Vacuum of hydrogen balance|| tt||Ventilation time, h
Spring and autumn
Ventilation rate
times·h
Simple table of hydrogen exhaust ventilation rate (control standard is 400Bg·m)Ventilation time for hydrogen balance, h
Spring and autumn
Enclosed hydrogen
kBq·m
Ventilation rate
times·h
Ventilation time for hydrogen balance, h
Instructions for use of simple table of hydrogen exhaust ventilation
Ventilation rate
times·h
Ventilation time for hydrogen balance, h
Measure the hydrogen concentration of an underground building after 6 days of sealing, which is the enclosed hydrogen concentration. A3.1
Ventilation rate
times·h
Ventilation rate
times·h'
Ventilation time for hydrogen equilibrium, h
Ventilation time for hydrogen equilibrium, h
A3.2The ventilation rate corresponding to the enclosed hydrogen concentration under the column of the season for measuring the enclosed hydrogen concentration is the ventilation rate to be found. The ventilation rate refers to the fresh air ventilation rate, and is considered as continuous ventilation. For example, if the air intake rate in an underground building is 5×10km3·h, A3.3
The volume of the underground space is 10km, then the fresh air ventilation rate is 0.5·h. A3.4When you occasionally stay in an underground building for a short period of time, you should ventilate first, and then enter after the ventilation time reaches the ventilation time for hydrogen equilibrium, and ventilate continuously during your stay.
A3.5 When compiling the simple table, the hydrogen concentration in the fresh air is taken as 7Bq·m3. If the hydrogen concentration in the fresh air is higher, the ventilation rate should be appropriately corrected. A3.6 When calculating the exhaust ventilation rate of a newly designed underground building, the enclosed hydrogen concentration of the underground building closest to the area where the newly designed underground building is located can be referred to.
Unit conversion relationship of hydrogen and its daughter concentration
(Informative Appendix)
Unit conversion relationship
1Bq°m*=3.45·10*MeV·m2=5.510Jm3=0.27mWLUnit conversion relationship of hydrogen and its daughter exposure1Jhm2=6.24.10'2MeVhm2=4.8.10°WLh=1.8·10\Bqhm31WLM=170WLh=2.2·10°MeVhm=3.5·10Jhm=6.310°Bqhm1Bqam38760Bqh m3
Concentration unit conversion table for control standards
Equilibrium equivalent hydrogen concentration
Action level
Design level
Annual exposure unit conversion table corresponding to control standards Table B2
Control standard
(Equilibrium equivalent hydrogen concentration)
Time integral of equilibrium equivalent hydrogen concentration
10°Bqhm
Hydrogen daughter alpha potential concentration
Time integral of hydrogen daughter alpha potential concentration
10'MeV·L\
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