GB/T 39325-2020Specification for radiation shielding of superconducting proton cyclotron (English PDF)
超导回旋质子加速器辐射屏蔽规范
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 19, 2020
Implementation date
June 1, 2021
Scope
GB/T 39325-2020 is the English-translated version of 超导回旋质子加速器辐射屏蔽规范.
GB/T 39325-2020 is the Chinese standard "Specification for radiation shielding of superconducting proton cyclotron".
Its scope clause reads: This standard specifies the general requirements for the shielding of the superconducting cyclotron proton accelerator room, the reference control level of dose rate, shielding calculation and radiation monitoring requirements.
This standard applies to the radiation shielding design of superconducting cyclotron proton accelerators with proton energy in the range of 70MeV~1000MeV. It can also be used for the radiation shielding design of other types of proton accelerators with proton energy in the range of 70MeV~1000MeV. Its clauses include terms and definitions.
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Document preview — GB/T 39325-2020
National Standard of the People's Republic of China
- ICS
- 27.120.99
- Classification
- F 91
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 3.1 Superconducting cyclotron proton accelerator
- 3.2 Residence factor
- 3.3 Use factor
- 3.4 Beam loss
- 3.5 Secondary neutron
1 Scope
This standard specifies the general requirements for the shielding of the superconducting cyclotron proton accelerator room, the reference control level of dose rate, shielding calculation and radiation monitoring requirements.
This standard applies to the radiation shielding design of superconducting cyclotron proton accelerators with proton energy in the range of 70MeV~1000MeV.
It can also be used for the radiation shielding design of other types of proton accelerators with proton energy in the range of 70MeV~1000MeV.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 4960.5 Nuclear Science and Technology Terms Radiation Protection and Radiation Source Safety
GBZ /T 202-2007 Dose conversion factor for neutron external radiation protection
3 Terms and definitions
The following terms and definitions defined in GB/T 4960.5 apply to this document.
3.1 Superconducting cyclotron proton accelerator
A circular accelerator that uses superconducting magnets to provide a constant guided magnetic field, uses a constant frequency electric field to accelerate, and the proton beam moves along a spiral orbit.
3.2 Residence factor
The average time that the largest irradiated person stays in the area of the radiation source during the beaming time accounts for the share of the beaming time.
3.3 Use factor
The time that the primary radiation beam (useful beam) irradiates in a useful beam shielding direction accounts for the share of the total irradiation time.
3.4 Beam loss
During the formation, acceleration, extraction, and transportation of the proton beam, the beam intensity caused by the interaction with the accelerator system components
Partial or total loss of beam energy.
3.5 Secondary neutron
Neutrons produced by the interaction of protons with matter.
Note. In general, secondary neutrons include cascade neutrons and evaporation neutrons.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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