Mijnheer B J, Williams J R
Phys Med Biol. 1981 Jan;26(1):57-69. doi: 10.1088/0031-9155/26/1/007.
Equations are derived for the determination of absorbed dose and kerma free-in-air from measurements with a tissue-equivalent ionisation chamber in a neutron field. Three methods of calibration of the chamber are considered; an exposure calibration in air in a photon beam, an absorbed-dose calibration in a phantom in a photon beam, and an absorbed-dose calibration using a calorimeter in a neutron beam. An uncertainty analysis of the results obtained using the different methods of calibration is made and it is concluded that the calorimetric method gives the greatest overall accuracy, the major uncertainty in this technique being due to uncertainties in the kerma data used to convert absorbed dose in the wall material to absorbed dose in tissue. A detailed discussion is given of the correction factors that must be applied to the chamber reading to account for its finite size during calibration and measurements in air as well as in a phantom.
推导了通过在中子场中使用组织等效电离室进行测量来确定空气比释动能和吸收剂量的方程。考虑了三种电离室校准方法；在光子束中空气中的照射校准、在光子束模体中的吸收剂量校准以及在中子束中使用量热计的吸收剂量校准。对使用不同校准方法获得的结果进行了不确定度分析，得出量热法总体精度最高的结论，该技术的主要不确定度源于用于将壁材料中的吸收剂量转换为组织中吸收剂量的比释动能数据的不确定度。详细讨论了在校准以及在空气和模体中测量期间必须应用于电离室读数的校正因子，以考虑其有限尺寸。
