WS/T 831-2024 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 5 business days
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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
Background and significance of standard revision
WS/T 831-2024, as a health industry standard issued by the National Health Commission, replaces the GBZ/T 146-2002 version which has been implemented for 22 years. This revision reflects the advancement of the terminology system under the background of the rapid development of radiological diagnosis and treatment technology. The main changes include:
| Revision dimensions | 2002 edition | 2024 edition |
|---|---|---|
| Term classification structure | 5 chapters | 6 chapters (new chapter on interventional radiology) |
| Total number of terms | 94 items | 111 items (17 new items) |
| Dosimetric concepts | Basic dose indicators | 8 new practical quantities such as directional dose equivalent |
Analysis of core terminology system
1. Basic protection concepts
Medical ionizing radiationThe definition is revised to "the general term for ionizing radiation used in the medical field", emphasizing the multimodal fusion feature. Key updates include:
- Planned exposure situation: A new definition was added to distinguish between routine medical exposure and accidental exposure
- Management target values: Supplement specific quantitative indicators for the optimal implementation of radiation protection
- Diagnostic reference level: Clarify the synonym for the guidance level for medical exposure
2. Upgrade of dosimetry system
Introduce the latest concepts of ICRU Report 95 and establish a dual-track dose characterization system:
Case application: In proton therapy, the directional absorbed dose of the lens (3.108) can more accurately assess the organ-specific radiation risk. Its measurement requires the use of a tissue equivalent phantom and a silicon photomultiplier tube detector.
Comparison of clinical application terms
X-ray diagnosis and interventional radiology
Technology iteration drives terminology update:
- "Tomography" → X-ray tomography (4.14)
- Added 7 digital imaging technology terms such as Digital breast tomosynthesis (4.11)
- Interventional operation-related dose indicators: dose area product (4.74) is included in the standard
Evolution of radiotherapy technology
Reflecting the development needs of precision radiotherapy:
| Therapeutic technology | New terms | Clinical significance |
|---|---|---|
| Proton therapy | Relative biological effectiveness (3.96) | Evaluation of radiation effects at different LETs |
| VMAT | Volumetric modulated radiation therapy (6.10) | Dynamic dose delivery technology |
Implementation recommendations
- Medical institutions should establish a terminology comparison table and update DICOM tags in PACS systems
- Quality control should focus on parameter verification of new technologies such as CT spectral imaging (4.16)
- Training materials should include cutting-edge concepts such as radiation bystander effects (3.26)
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