吸收剂量的测量

1、HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT吸收剂量测量的原理HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOT

2、HERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT吸收剂量的测量HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT空气中吸收剂量的测量空气中吸收剂量的测量AVQX1 HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT而吸收剂量则为： DaDa= X = X W/eW/e即： DaDa（J/kg)= = X X（R）2.58

3、10-4(C/kg/R)33.97(J/C) =0.87610-2（J/kgR）X X（R） DaDa （rad）= = 0.876（rad/R）X X ( R ) 即： DaDa = f = f X Xf f : 伦琴-拉德转换因子，或照射量照射量- -吸收剂量转换因子吸收剂量转换因子。HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERA

4、PY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT介质、设备和技术要求HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPART

5、MENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT介质、设备和技术要求HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT介质、设备和技术要求HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPART

6、MENTHBCH RADIOTHERAPY DEPARTMENT电离室的结构与技术要求HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT适用于放射治疗测量用的电离室的主要指标HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHER

7、APY DEPARTMENT示值非线性HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT参考源及其应用HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT应用电离室剂量仪的注意事项HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT规 程 演 变HB

8、CH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT规 程 演 变 （ICRU）规 程 演 变 （AAPM）aircapencapairairwallenwallairwallwalliongasLLAAeWkNxN)/()/)(1 ()/()/()/( HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT规 程 演 变 （IAEA）HBCH RADIOTHERAPY

9、DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT规 程 演 变 （IAEA与ICRU的差异）HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT规 程 演 变 （W/e的变化）HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT

10、HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTn电离室校准u辐射场：钴-60射线或2MV X射线u满足电子平衡钴-60射线在水中的吸收剂量为： CeWanewen)/()/(anewenweWNRD)/()/( 钴-60射线照射量-吸收剂量转换因子CawCawanewenPPSSdSSeWC )/()/()/()/()/()/(射线质量C（水中）C（组织中）钴-6

11、00.950.944MV0.940.948MV0.930.9212MV0.920.9116MV0.910.9020MV0.900.8930MV0.890.87不同物质在不同能量时的不同物质在不同能量时的C值值对高能电子束，水中吸收剂量计算的标准公式为：CEawEPPSSdeWCZ )/()/(HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHE

12、RAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH

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14、RTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHER

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16、ENT电离室的有效测量点HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT0.6HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT0.6HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT不同射线深度剂量特性的比较0100HBCH RADIOTHE

17、RAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT电离室校准因子（ND）的确定HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT电离室校准因子（ND）的确定HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT电离室校准因子（ND）的确定HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT电离室校准因子（ND）的确定HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH