神龙二号多脉冲X射线剂量测量

李勤; 刘军; 王毅; 刘云龙; 李天涛; 石金水; 李劲

doi:10.11884/HPLPB201931.180234

神龙二号多脉冲X射线剂量测量

doi: 10.11884/HPLPB201931.180234

中国工程物理研究院流体物理研究所, 四川绵阳 621900

基金项目: 国防科技专项研究基金项目

详细信息

作者简介:
李勤(1968—)，女，副研究员，主要从事电子直线感应加速器物理参数测量研究; liqin288@163.com

中图分类号: TL506
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出版历程
- 收稿日期: 2018-09-10
- 修回日期: 2018-11-06
- 刊出日期: 2019-01-15

Multi pulse X-ray dose measurement of Dragon-Ⅱ

Institute of Fluid Physics, CAEP, P.O.Box 919-106, Mianyang 621900, China

摘要

摘要: 神龙二号加速器可以产生三个脉冲宽度约80 ns(FWHM)、脉冲间隔约500 ns的X射线，为了获得每个脉冲X射线剂量，采用康普顿探测器和热释光剂量计相结合的方法进行测量。针对神龙二号加速器X射线能谱分布，采用MCNP程序优化设计康普顿探测器，测量多脉冲X射线信号，获得每个脉冲的剂量比例，应用热释光剂量计测量多脉冲X射线总剂量，由总剂量和剂量比例准确得到每个脉冲X射线剂量，实现神龙二号加速器多脉冲X射线剂量测量。
- 康普顿探测器 /
- 热释光剂量计 /
- 多脉冲 /
- X射线剂量 /
- 测量
Abstract: Dragon-Ⅱ is a linear induction accelerator, which can produce up to three bremsstrahlung X-ray pulses. Each X-ray pulse width is about 80 ns(FWHM), and time interval between pulses is about 500 ns. Each pulse X-ray dose is a critical parameter for Dragon-Ⅱ. Compton detector, combined with thermo luminescent dosemeter(TLD), was used to measure X-ray dose per pulse. MCNP program was used to design a Compton detector according to the characteristic of bremsstrahlung produced by Dragon-Ⅱ accelerator. Compton detector can measure multi-pulse X-ray signal and one pulse X-ray signal's integral is proportional to each pulse X-ray dose, and according to the total dose of three pulse X-ray obtained from TLD, each pulse X-ray dose can be obtained accurately.
- Compton detector /
- thermo luminescent dosemeter /
- multi-pulse /
- X-ray dose /
- measurement

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图 1 介质型康普顿探测器结构示意图

Figure 1. Layout of a dielectric Compton detector

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图 2 神龙二号X射线能谱

Figure 2. Bremsstrahlung X-ray energy spectrum of Dragon-Ⅱ

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图 3 探测器灵敏度系数的能量响应

Figure 3. Energy response of Compton detector sensitivity

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图 4 打靶电子束流和脉冲X射线测量信号

Figure 4. Signals of electron beam and pulsed X-ray

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图 5 打靶电子束流信号和康普顿探测器测量的三脉冲X射线信号

Figure 5. Signals of electron beam by beam monitor and three pulsed X-ray by Compton detector

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表 1 X射线累计照射后的剂量测量结果

Table 1. X-ray dose measurement results by cumulative irradiation

No.	E_e/MeV	I_b/kA	X_s/R	X_d/R	X_t/R
5267A	18.6	2.06	353	728	1048
5268B	18.6	2.03	398	728	1048
5269C	18.3	1.91	362		1048

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表 2 康普顿探测器和热释光剂量计测量结果比值

Table 2. Ratio of TLD to Compton detector measurement results

No.	X-ray dose/R	integral of CD signals/(nV·s)	ratio/(R·nV^-1·s^-1)
5266A	356	960	0.37
5267A	353	960	0.37
5268B	398	1110	0.36
5269C	362	1010	0.36
5270AC	698	1840	0.38

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表 3 神龙二号加速器X射线剂量测量结果

Table 3. X-ray dose measurement results of Dragon-Ⅱ

No.		E_e/MeV	I_b/kA	total X-ray dose/(C·kg^-1)	integral of CD signals/(nV·s)	X-ray dose per pulse/(C·kg^-1)
	pulse A	18.2	2.03		1250	0.093
No.5273	pulse B	18.2	2.01	0.284	1310	0.098
	pulse C	18.2	2.05		1240	0.093
	pulse A	19.0	2.09		970	0.110
No.5301	pulse B	19.0	2.06	0.331	1020	0.116
	pulse C	18.9	2.12		920	0.104
	pulse A	19.0	2.08		950	0.104
No.5302	pulse B	19.0	2.06	0.315	1030	0.113
	pulse C	18.9	2.12		900	0.099
	pulse A	19.0	2.08		930	0.103
No.5303	pulse B	18.9	2.06	0.318	1030	0.114
	pulse C	18.9	2.11		910	0.101

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