Ferrous-Ferric Ion exchange dosemeter.
Ferrous-Ferric Ion exchange dosemeter.
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亚铁-三价铁离子交换剂量计。
DOI：
10.1093/rpd/nci594
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发表时间：
2006
影响因子：
1
通讯作者：
Hammer,BruceE
中科院分区：
文献类型：
--
作者：
Bauhs,JohnA;Hammer,BruceE
在这项工作中，三维亚铁离子交换剂量计的建议和剂量响应测量。剂量计由水中的H型强酸阳离子交换树脂珠组成。通过将Amberlyst 15湿珠浸泡在硫酸亚铁铵水溶液中以将亚铁离子交换为H+离子来制备具有0.600-0.850 mm的调和平均直径的Amberlyst 15湿珠。将珠粒用蒸馏水冲洗并包装在玻璃小瓶中。用来自Varian 2100 C直线加速器的6 MV X射线对亚铁离子浓度为0.5和1.0 mM的样品组进行剂量处理。样品的自旋-晶格弛豫时间常数（T1）使用与1.5 T磁体（Magnex，阿宾登，英国）连接的Apollo光谱仪（Tecmag，Houston，TX）测量。每个样本有两个T1值;长T1在1200 ms，不随剂量显著变化，短T1范围从0戈伊的56 ms到100戈伊的36 ms。R1与剂量响应呈线性关系，斜率为0.066和0.079 s-1Gy-1。
In this work a three-dimensional ferrous–ferric ion exchange dosemeter is proposed and the dose response measured. The dosemeter consists of strong acid cation exchange resin beads in the H form in water. Amberlyst 15 Wet beads with a harmonic mean diameter of 0.600–0.850 mm were prepared by soaking them in an aqueous solution of ferrous ammonium sulphate to exchange ferrous ions for H+ions. The beads were rinsed with distilled water and packed in glass vials. Sets of samples with ferrous ion concentrations of 0.5 and 1.0 mM were dosed with 6 MV X rays from a Varian 2100C linac. The spin-lattice relaxation time constants (T1) for the samples were measured using an Apollo spectrometer (Tecmag, Houston, TX) interfaced to a 1.5 T magnet (Magnex, Abingdon, UK). Each sample had two T1 values; a long T1 at 1200 ms that did not significantly change with dose and a short T1 that ranged from 56 ms at 0 Gy to 36 ms at 100 Gy. The R1 vs. dose responses were linear with slopes of 0.066 and 0.079 s−1Gy−1.