[1]刘一蓉,刘金源,牛香玉,等. 逆向拟合法量化测定X线与物质相互作用后的强度变化规律[J].中国医学物理学杂志,2018,35(3):296-302.[doi:DOI:10.3969/j.issn.1005-202X.2018.03.010]
　LIU Yirong,LIU Jinyuan,NIU Xiangyu,et al. Quantitative measurement and verification of X-ray intensity variations after interaction with substances by reverse fitting method[J].Chinese Journal of Medical Physics,2018,35(3):296-302.[doi:DOI:10.3969/j.issn.1005-202X.2018.03.010]
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 逆向拟合法量化测定X线与物质相互作用后的强度变化规律()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
35卷
期数:
2018年第3期
页码:
296-302
栏目:
医学影像物理
出版日期:
2018-03-20

文章信息/Info

Title:
 Quantitative measurement and verification of X-ray intensity variations after interaction with substances by reverse fitting method
文章编号:
1005-202X（2018）03-0296-07
作者:
 刘一蓉; 刘金源; 牛香玉; 秦瑞平
 河北医科大学医学影像学院， 河北 石家庄 050000
Author(s):
 LIU Yirong;  LIU Jinyuan;  NIU Xiangyu;  QIN Ruiping
 School of Medical Imaging, Hebei Medical University, Shijiazhuang 050000, China
关键词:
 ; X线强度; 衰减; 逆向拟合法; 实验教学; X射线衍射仪
Keywords:
 ; X-ray intensity;  attenuation;  reverse fitting method;  experimental teaching;  X-ray diffractometer
分类号:
O434.1
DOI:
DOI:10.3969/j.issn.1005-202X.2018.03.010
文献标志码:
A
摘要:
 目的：使用X线衍射仪、自制载物台逆向拟合法量化分析X射线与不同物质相互作用后的强度变化规律及影响因素。 方法：实验使用逆向拟合法验证朗伯比尔定律，列举可能影响穿过物质层后的X射线强度的若干因素（管电压、管电流、距离、物质原子序数和物质层厚度等），设计多组实验样本，通过各组对各种因素的实验验证，逆向说明影响因素与穿过物质层后X射线强度的关系。 结果：在实验设备有效量程范围内，管电流、物质层厚度和原子序数与穿过物质层的X射线强度呈线性关系；而管电压和X射线发射器与接收器间的距离与穿过物质层的X射线强度呈非线性关系，即当管电压发生线性变化时，穿过物质层后的X射线强度在10~25 kV范围内的管电压下缓慢增加，在25~35 kV范围内时X射线强度迅速增大，X射线强度∝kV2；当X射线发射器与接收器间距离发生线性变化时，穿过物质层的X射线强度在9.00~13.00 cm距离范围内变化显著，而在13.00~17.00 cm距离范围内变化不明显，X射线强度∝1/r2。通过以上关系验证了朗伯比尔定律及其普适性，并探讨利用模拟人进行深入实验验证。 结论：该方法简单直观，可快速测定X射线与不同物质相互作用后的强度变化规律，验证相关影响因素，可用于相关医学物理实验教学。
Abstract:
 Objective To propose a reverse fitting method using X-ray diffractometer and homemade experiment stage for quantitatively analyzing the changes of X-ray intensity and influence factors after X-ray interacting with different substances. Methods Langbobier law was verified by inverse fitting method in this experiment. Several factors that might affect X-ray intensity after X-ray passing through the material layer were enumerated, such as tube voltage, tube current, distance, atomic number, thickness of the substance and so on. Moreover, multiple sets of experimental samples were designed for the experimental verification of these influence factors, which reversely illustrated the relationship between influence factors and X-ray intensity after passing through the material layer. Results Within the effective range of X-ray diffractometer, tube current, the thickness and atomic number of the material layer were linearly related to X-ray intensity after passing through the material layer; tube voltage, the distance between X-ray transmitter and receiver were nonlinear with X-ray intensity after passing through the material layer. When the tube voltage changed linearly, X-ray intensity after passing through the material layer increased slowly under the tube voltage in the range of 10 kV to 25 kV, and increased rapidly under the tube voltage of 25 kV to 35 kV (X-ray intensity ∝KV2). When the distance between X-ray transmitter and receiver was linearly changed, X-ray intensity passing through the material layer changed significantly under the distance of 9.00 cm to 13.00 cm, while in the range of 13.00 cm to17.00 cm, the changes of X-ray intensity was not obvious (X-ray intensity ∝1/r2). Through the above findings, we verified the correctness and universality of Langbobier law, and based on it, explored the further experimental research using phantom. Conclusion The proposed method which is simple and intuitive can be used in related medical physics experimental teaching for it can accurately and conveniently determine the law of X-ray intensity variations after X-ray interacting with different substances, and verify the relevant influence factors.

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备注/Memo

备注/Memo:
 【收稿日期】2017-11-21
【基金项目】河北省高等教育教学改革研究与实践项目（2016GJJG074）
【作者简介】刘一蓉，E-mail: lyr1704@sina.com
【通信作者】秦瑞平，副主任技师，E-mail: 821892174@qq.com
更新日期/Last Update: 2018-03-21