| 韩军,李勤,曹婷,梁志文,陈秘.四种剂量探测器对放疗加速器常用剂量率的响应特性分析[J].中华放射医学与防护杂志,2012,32(5):527-529 |
| 四种剂量探测器对放疗加速器常用剂量率的响应特性分析 |
| The dose rate response characterization of four kinds of dosimeters for linear accelerator |
| 投稿时间：2012-03-26 |
| DOI：10.3760/cma.j.issn.0254-5098.2012.05.023 |
| 中文关键词: 剂量率 剂量验证 剂量探测器 响应特性 |
| 英文关键词:Dose rate Dose verification Dosimeter Response characterization |
| 基金项目: |
|
| 摘要点击次数: 3081 |
| 全文下载次数: 2603 |
| 中文摘要: |
| 目的 探讨4种剂量探测器对放疗加速器常用剂量率的响应特性。方法 在100~600 cGy/min的剂量率范围内,分别测量PTW的0.6 cm3电离室、0.015 cm3电离室以及Matrixx Evolution 二维电离室矩阵和MapCHECK 二维半导体矩阵在同一测量条件和剂量下的剂量率响应;测量和分析0.6 cm3电离室在不同能量和工作电压下的剂量率响应特性。结果 PTW的0.6 cm3电离室、0.015 cm3电离室以及Matrixx Evolution 二维电离室矩阵在6 MV X射线能量下都表现一定的剂量率依赖性,差异均<1%,在15 MV X射线能量下,无剂量率依赖性。MapCHECK 二维半导体矩阵在6 MV X射线和15 MV X射线能量下都显示了较强剂量率依赖性,响应差异在2%左右。结论 依据剂量率变化治疗技术的放疗加速器的剂量测量,需要对测量设备进行剂量率响应测试和分析,以保证日常刻度和剂量验证的精度。 |
| 英文摘要: |
| Objective To explore the dose rate response characterization of four kinds of dosimeters for clinical application. Methods Within the range of 100-600 cGy/min, the dose rate responses of the PTW 0.6 cm3 ion chamber, 0.015 cm3 ion chamber, Matrixx Evolution 2D diode array and MapCHECK 2D diode array under the same measuring conditions were measured. The dose rate response of the PTW 0.6 cm3 ion chamber under different energy and working voltage were analyzed.Results All ionization chamber types of measured equipment showed certain dose rate dependence for 6 MV X-rays. All the differences were below 1%.The dose rate dependence disappeared for 15 MV X-rays. The 2D diode array had strong dose rate dependence and the response difference was about 2%.Conclusions It is necessary to test and analyze the dose rate response of the measured equipment in treatment technology with dose rate varying, in order to ensure the precision of daily calibration and dose verification. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|