多层平板电离室优化设计

doi:10.11889/j.0253-3219.2019.hjs.42.060202

Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (6): 60202-060202.doi: 10.11889/j.0253-3219.2019.hjs.42.060202

• ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS • Previous Articles Next Articles

Optimization design of a multilayer ionization chamber

Yaqiong GE^1,²,Chongxian YIN²(),Zhen LI¹(),Hanwen DU²

1. Shanghai University, Shanghai 200444, China
2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

Received:2019-03-27 Revised:2019-04-25 Online:2019-06-10 Published:2019-06-18
Contact: Chongxian YIN,Zhen LI E-mail:yinchongxian@sinap.ac.cn;lizhen@shu.edu.cn
About author:GE Yaqiong, female, born in 1995, graduated from University of South China in 2016, master student, focusing on nuclear detection technology

Abstract

Abstract: Background

Multilayer ionization chamber (MLIC) can significantly reduce the measurement time of proton pencil beam dose depth distribution, which is of practical significance for improving the efficiency of daily quality assurance of proton therapy.

Purpose

This study aims to optimize the design of a MLIC to realize fast and accurate dose verification.

Methods

Based on Monte-Carlo method, simulation of the MLIC was performed by using Geant4 codes. To evaluate the measurement uncertainties of the MLIC, materials of FR-4, polymethylmethacrylate (PMMA), Al were applied and the depth dose distribution in each material were compared with water phantom to evaluate the uncertainties caused by different material. Then the depth dose distribution was corrected by the collection efficiency of each layer of the MLIC in different sensitive area, and the deviation compared with water phantom after correction was calculated.

Results

The final measurement accuracy of the optimized MLIC in the depth dose distribution is within ±5%, and range accuracy is within ±1 mm.

Conclusion

The optimized MLIC could replace the water tank to achieve fast daily quality assurance in clinical use.

Key words: Proton therapy, Monte-Carlo method, Multilayer ionization chamber

CLC Number:

TL99

Yaqiong GE, Chongxian YIN, Zhen LI, Hanwen DU. Optimization design of a multilayer ionization chamber[J].Nuclear Techniques, 2019, 42(6): 60202-060202.

Figures/Tables 9

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References 9

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质子能量Energy / MeV	Al			PMMA
质子能量Energy / MeV	本文Geant4计算结果Geant4 simulation results for this work	参考文献[8]Geant4计算结果Geant4 simulation results for reference [8]	参考文献[9]实测结果Experimental results for reference [9]	本文Geant4计算结果Geant4 simulation results for this work	参考文献[8]Geant4计算结果Geant4Simulation results for reference [8]	参考文献[9]实测结果Experimental results for reference [9]
70	2.001	2.040	—	1.164	1.152	—
100	2.105	2.050	2.123	1.150	1.157	1.174
150	2.119	2.119	2.133	1.159	1.159	1.173
175	2.136	2.112	2.145	1.160	1.171	1.173
200	2.127	2.113	2.139	1.159	1.169	1.172
225	2.126	2.125	2.144	1.163	1.171	1.172
235	2.122	—	—	1.162	1.159	—

质子能量Energy / MeV	射程误差ΔR ₉₀ Difference of R ₉₀ / mm
质子能量Energy / MeV	MLIC-128	MLIC-180
70	1.24	0.80
100	2.10	0.90
130	1.07	0.32
160	0.94	0.35
200	0.14	?0.39
235	?0.46	?0.43

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Optimization design of a multilayer ionization chamber

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