| 纪刚,郭勇,朱云平,周振山,王兴功,杨甲祥.大射野、大深度照射条件下组织-空气比的测量[J].中华放射医学与防护杂志,1997,17(3):169-172 |
| 大射野、大深度照射条件下组织-空气比的测量 |
| Measurement and calculation of tissue air ratios of cobalt-60 gamma radiation in large field and depth |
| 投稿时间：1996-11-20 修订日期：1997-02-20 |
| DOI： |
| 中文关键词: 组织-空气比 吸收剂量 体模 深度 射野 60Coγ放射源 |
| 英文关键词:Tissue air ratio Absorbed dose Phantom Depth Field 60Co γ-radiation |
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| 中文摘要: |
| 目的 组织-空气比是用于放射治疗和诊断剂量学及事故剂量估算最重要的物理量之一, 而目前国内外尚没有大射野、大深度照射条件下组织-空气比数据文献报道。方法 本文以60Coγ放射源, 采用固定探测器, 改变源皮距的实验方法, 测量了深度至70.0cm, 射野至50.0cm×50.0cm的组织-空气比数值。结果 实验测量结果同文献现有数据比较, 相对误差小于±5%.结论 测量大射野、大深度照射条件下组织-空气比数据对于放射事故外照射人体剂量估算及放射诊断、治疗剂量学具有重要的意义。 |
| 英文摘要: |
| Objective Tissue air ratio(TAR) is the one of useful concepts and methods in radiation dosimetry.There are no available TAR data for large field and depth irradiation and more research is needed to investigate the properties of TAR and other relative quantities under special irradiation. Methods Data of TAR for depth up to 70.0cm and rectangular field size up to 50.0cm×50.0cm have been obtained for 60Coγ-rays. Results For depth less than 30.0cm and field size less than 50.0cm×50.cm, the relative errors between the data by the experiment and by reference are less than 5 percent. Conclusions It is very important to measure TAR under the condition of irradiation in large depth and field sizes for the measurment and calculation of dose distribution in human body after a radiological accident. |
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