# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (4): 48

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### Design of detector to monitor the Bragg peak location of carbon ions by means of prompt γ-ray measurements with Geant4

Yan Fan, Guang-Ming Huang, Xiang-Ming Sun, Zhen Wang, Shu-Guang Zou, Jun Liu, Dong Wang, Hui-Li Kang, Ping Yang, Hua Pei, Da-Ming Sun, Zi-Li Li

1. PLAC, Key Laboratory of Quark & Lepton Physics (MOE), Department of Physics Science and Technology, Central China Normal University, Wuhan 430079, Hubei, China
• Contact: Yan Fan E-mail:fyanf@mails.ccnu.edu.cn
• Supported by:

This work was supported by the National Natural Science Foundation of China (Nos. 11375073 and U1232206).

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Yan Fan, Guang-Ming Huang, Xiang-Ming Sun, Zhen Wang, Shu-Guang Zou, Jun Liu, Dong Wang, Hui-Li Kang, Ping Yang, Hua Pei, Da-Ming Sun, Zi-Li Li. Design of detector to monitor the Bragg peak location of carbon ions by means of prompt γ-ray measurements with Geant4.Nuclear Science and Techniques, 2018, 29(4): 48
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Abstract:

Real-time monitoring of the Bragg peak location of carbon ions is urgently required for the quality control of hadron therapy. In this study, we design an annular detector to monitor the Bragg peak location of carbon ions with Geant4 simulation. This 360 surrounding structure has a high detection efficiency for the small-dose situation. The detector consists of a multilayered collimator system and an NaI scintillator for prompt gamma counting. The multilayered collimator includes a lead layer to prevent unwanted gammas and the paraffin and boron carbide layers to moderate and capture fast neutrons. An inclination of the detector further diminishes the background signal caused by neutrons. The detector, with optimized parameters, is applicable to carbon ions of different energies. In addition, the scintillator is replaced by an improved EJ301 organic liquid scintillator to discriminate gammas and neutrons. Inserting thin Fe slices into the liquid scintillator improves the energy deposition efficiency. The Bragg peak location of 200 MeV/u carbon ions can be monitored by prompt gamma detection with the improved liquid scintillator.