GBZ/T 154-2002 Annual intake limits of radioactive aerosols of different particle sizes GBZ/T154-2002 standard download decompression password: www.bzxz.net

Ics13.100
L Health Standard
National Occupation of the People's Republic of China
GBZ/T154-2002
Annual limits on intakes for radioactive aerosol with different particle size
Promulgated on April 8, 2002
Ministry of Health of the People's Republic of China
Implementation on June 1, 2002
Normative references
Terms and definitions
Dose equivalent limit
Secondary limit
Derived air concentration
Internal and external mixed exposureWww.bzxZ.net
Appendix A (Normative Appendix) Annual limits on inhalation intake (ALI) for radioactive aerosols of different particle size(s) Foreword
This standard is formulated in accordance with the Occupational Disease Prevention and Control Law of the People's Republic of China. If the original standard GB/T16144-1995 is inconsistent with this standard, this standard shall prevail. This standard was mainly based on GB4792-84 "Basic Standard for Radiation Health Protection", in which the annual dose limit for radiation workers is 50mSv. According to the existing IAEA international standard, the annual dose limit has been changed to 20mSv, and the country is also planning to make corresponding changes. However, since there has been no formal change in China, and the amount of data for the annual aerosol intake limit (ALI) listed in Table A1 of Appendix A of this standard is too large to make corresponding changes for the time being, attention should be paid when using it. When used in the future, it should be increased or decreased according to the change of the annual dose limit.
Appendix A of this standard is a normative appendix
This standard is proposed and managed by the Ministry of Health.
The drafting unit of this standard is: Beijing Institute of Radiation Medicine, and the main drafters of this standard are: Ye Changqing and Shen Zhiyuan. The Ministry of Health is responsible for interpreting this standard.
1 Scope
Radioactive Aerosols of Different Particle Sizes
Annual Intake Limits
GBZ/T154-2002
This standard specifies the annual intake limits (ALD) of radioactive aerosols of different particle sizes for radiation workers. This standard applies to workplaces where radioactive aerosols may exist in the space where radiation workers are located, and serves as a basis for evaluating the degree of air radioactive aerosol contamination and estimating the internal exposure inhalation hazards of personnel. 2 Normative References
The provisions of the following documents become the provisions of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard.
GB4792
3 Terms and Definitions
Basic Standard for Radiological Protection
The following terms and definitions apply to this standard.
Aerosol
Suspended system consisting of solid particles or liquid droplets dispersed in a gas. 3.2
Particle size
The size of aerosol particles, also known as particle diameter. For aerosols, it is a general term for particle size and distribution. In this standard, the activity median aerodynamic diameter (AMAD) is used to represent particle size. 3.3
Activity median aerodynamic diameter
activity-medianeaerodynamic diameter When an aerosol particle settles in the air, the slipstream velocity is equal to the slipstream velocity of a sphere with a density of 1 mg/cm2 when it settles under the same aerodynamic conditions. The diameter of this sphere is called the aerodynamic diameter of the aerosol particle. If among all aerosol particles, particles with diameters larger and smaller than the above aerodynamic diameter each account for half of the total activity, then this diameter is called the activity median aerodynamic diameter (AMAD for short). 4 Dose equivalent limits
4.1 The dose equivalent limits adopted in this standard are the same as the dose limits for radiation workers in Chapter 2 of GB4792. 4.2 In order to prevent positive and harmful non-stochastic effects, the annual dose equivalent H received by any organ or tissue (except the lens of the eye) shall not exceed 500mSv/a
4.3 In order to limit stochastic effects, when the whole body is uniformly irradiated, the annual dose equivalent should not exceed 50mSv/a. When the whole body is irradiated non-uniformly, the annual effective dose equivalent He should satisfy the following inequality: He≤50mSv/a.
Where:
He-ZW-H
Annual dose equivalent of tissue or organ (T), mSv/a; relative risk weight factor of tissue or organ (T). 5 Secondary limits
5.1 In order to ensure that the internal radiation dose equivalent does not exceed the dose limit, the amount of radionuclides (I) ingested by radiation workers in one year should not exceed the corresponding annual intake limit (AL5.2 The ALI of a single radionuclide is the smaller of the values ​​obtained by the following two formulas: Random
Non-random
Where:
I (random)
I (non-random)
Annual intake obtained under the constraints of random effects, Bq: (23
（3）
Minimum annual intake corresponding to each relevant organ or tissue (T) obtained under the constraints of non-random effects , Bq;
Annual effective dose equivalent limit based on stochastic effects given in Article 4.3, mSv/a:HeE.L
Annual dose equivalent limit based on non-stochastic effects given in Article 4.2, mSv/a; Conversion factor for committed dose equivalent received by T organs or tissues after inhalation of unit activity radioactive nuclides, Sv/Bq. 5.3 For radiation workers, the annual intake limit of inhalation of radioactive aerosols of different particle sizes (Φ) ALI. is listed in Appendix A (Normative Appendix).
6 Derivation of air concentration
6.1 For the convenience of monitoring and management, the concentration of radioactive aerosols of different particle sizes (Φ) in the air can be derived from ALI according to formula (4). The exported air concentration DAC of radioactive aerosol.
Where:
DAC. - The exported air concentration of radioactive aerosol of different particle size (), Bg/m2: V - The annual air breathing volume of workers in the workplace, 2400m3. 6.2 When the annual working hours and air breathing rate change, DAC. Can be adjusted according to the proportionality principle. 7 Internal and external mixed exposure
7.1 In the case of internal and external mixed exposure, if the immersion exposure is ignored and the constraints of non-stochastic effects are complied with, it can be considered that the dose limit specified in Chapter 4 will not be exceeded when the following inequality is met. He.#+
Where:
External exposure Annual effective dose equivalent of radiation, mSv/a; HE, external
I Annual intake of radioactive elements/, Bq: I, annual intake of radioactive elements/, Bq: 1 Annual intake limit of inhalation of small
radioactive elements/ [see Appendix E (Supplement) of GB4792], Bq; ALI annual intake limit of inhalation of radioactive elements/ [see Appendix A (Supplement) of this standard], Bq. ALIw.j
(5)
Appendix A
(Normative Appendix)
Annual intake limit of inhalation of radioactive aerosols of different particle sizes (ALI.)
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.