WS/T 830-2024 in English
VALIDStandard of dose conversion coefficients for radiological protection for external radiation exposures
- Issued on:2024-05-13
- Implemented on:2024-12-01
- File Format:PDF
- Delivery:Via email within 10 business days
$2,105.00
本标准给出了光子、中子、电子、正电子、质子、负μ子、正μ子、负π介子、正π介子和氦离子外照射放射防护中由辐射场量到防护量的转换系数和光子、中子外照射放射防护中由辐射场量到实用量的转换系数。
本标准适用于成人的外照射放射防护的剂量转换，包括以下能量单能线束的外照射：10 keV～10 GeV的光子、0.001 eV～10 GeV的中子、50 keV～10 GeV的正负电子、1 MeV～10 GeV的质子、1 MeV～10 GeV的正负μ子、1 MeV～200 GeV的正负π介子和1 MeV/u～100 GeV/u的氦离子。
Introduction
Analysis of the core content of the standard
The new standard integrates the technical contents of GBZ/T 144-2002 and GBZ/T 202-2007. The main updates are as follows:
| Technical Dimensions | Old Standards | WS/T 830-2024 |
|---|---|---|
| Energy Range | Photons 1.00×10-2~10MeV Neutrons 1.00×10-9~1.80×109MeV | Photon 1.00×10-3~1.00×103MeV Neutron 1.00×10-9~1.00×109MeV |
| New particle types | Photon/neutron only | Added 7 types including electron/proton/π meson/muon/helium ion |
| Phantom accuracy | Based on ICRP Report 74 | Using ICRP 110 voxel model (1.95 million voxels for males/3.89 million voxels for females) |
Application of key conversion factors
1. Effective dose conversion
Appendix B provides the conversion factors of 9 types of particles from fluence to effective dose, taking 10MeV photon AP irradiation as an example:
- Male reference phantom: 4.49 pSv·cm2
- Female reference phantom: 5.12 pSv·cm2 (influenced by breast tissue weight)
2. Organ dose conversion
Appendix C/D lists the conversion factors of 28 organs in detail, including:
Case: The dose conversion factor of 120kVp X-ray (equivalent energy ~70keV) on female breast in medical CT scan is 0.194 pGy·cm2 (AP irradiation)
Recommendations for the implementation of the standard
- Calibration of monitoring equipment: The conversion coefficients between photon kerma and practical quantity need to be updated according to Appendix G
- Radiotherapy planning: Proton/heavy ion therapy should use the conversion coefficients in Table B.5/B.10
- Nuclear facility protection: For neutron monitoring, it is recommended to use the ambient dose equivalent conversion coefficients in Appendix H
Technology evolution analysis
This standard reflects the latest research results of ICRP Report No. 103/110:
- The voxel model is used to replace the traditional mathematical phantom, and the spatial resolution is improved by 20 times
- The conversion coefficients for non-parallel beam irradiation conditions (ROT/ISO geometry) are introduced
- Added special conversion factors for eye lens (Appendix E) and local skin (Appendix F)
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