Torikoshi Masami, Ohno Yumiko, Yagi Naoto, Umetani Keiji, Furusawa Yoshiya
National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
Eur J Radiol. 2008 Dec;68(3 Suppl):S114-7. doi: 10.1016/j.ejrad.2008.04.052. Epub 2008 Jul 7.
A microbeam array was formed with a multi-slit collimator (MSC) for research on radiation therapy (MRT). Kodak EDR2 film was used to measure the dose distribution of the microbeam array. The calibration curve of optical density of the film with respect to a dose was established using a standard Farmer chamber and (60)Co gamma-ray source. The peak dose of 3.6 Gy/s at the maximum was derived from the film dosimetry using the calibration curve. The uncertainty was estimated to be 5% which was mainly attributed to the uncertainty of the calibration. It was found that the ionization chamber used for monitoring the dose during the MRT experiments gave lower dose by about 30% than the dose derived from the film dosimetry.
为了进行放射治疗（MRT）研究，使用多缝准直器（MSC）形成了一个微束阵列。采用柯达EDR2胶片来测量微束阵列的剂量分布。使用标准的 Farmer 电离室和（60）Coγ射线源建立了胶片光密度相对于剂量的校准曲线。利用该校准曲线通过胶片剂量测定法得出最大峰值剂量为 3.6 Gy/s。估计不确定度为 5%，这主要归因于校准的不确定度。结果发现，在 MRT 实验期间用于监测剂量的电离室给出的剂量比胶片剂量测定法得出的剂量低约 30%。
