Large Area Silicon Microdosimeter for Dosimetry in High LET Space Radiation Fields: Charge Collection Study

被引:21
作者
Livingstone, Jayde [1 ]
Prokopovich, Dale A. [2 ]
Lerch, Michael L. F. [1 ]
Petasecca, Marco [1 ]
Reinhard, Mark I. [2 ]
Yasuda, Hiroshi [3 ]
Zaider, Marco [4 ]
Ziegler, James F. [5 ]
Pisacane, Vincent L. [5 ]
Dicello, John F. [6 ]
Perevertaylo, Vladimir L. [7 ]
Rosenfeld, Anatoly B. [1 ]
机构
[1] Univ Wollongong, Ctr Med Radiat Phys, Wollongong, NSW 2522, Australia
[2] Australian Nucl Sci & Technol Org, Inst Mat Engn, Lucas Heights, NSW 2234, Australia
[3] Natl Inst Radiol Sci, Inage Ku, Chiba 2638555, Japan
[4] Mem Sloan Kettering Canc Ctr, Dept Med Phys, New York, NY 10065 USA
[5] USN Acad, Annapolis, MD 21402 USA
[6] Loma Linda Univ, Med Ctr, Dept Radiat Med, Loma Linda, CA 92354 USA
[7] SPA BIT, Kiev, Ukraine
基金
澳大利亚研究理事会;
关键词
Heavy ion therapy; ion beams; microdosimetry; silicon-on-insulator (SOI); space radiation; SOLID-STATE MICRODOSIMETRY; HEAVY-ION MICROPROBE; PROTON THERAPY; FABRICATION;
D O I
10.1109/TNS.2012.2219069
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Silicon microdosimeters for the characterisation of mixed radiation fields relevant to the space radiation environment have been under continual development at the Centre for Medical Radiation Physics for over a decade. These devices are useful for the prediction of single event upsets in microelectronics and for radiation protection of spacecraft crew. The latest development in silicon microdosimetry is a family of large-area n-SOI microdosimeters for real-time dosimetry in space radiation environments. The response of n-SOI microdosimeters to 2 MeV H and 5.5 MeV He ions has been studied to investigate their charge collection characteristics. The studies have confirmed 100% yield of functioning cells, but have also revealed a charge sharing effect due to diffusion of charge from events occurring outside the sensitive volume and an enhanced energy response due to the collection of charge created beneath the insulating layer. The use of a veto electrode aims to reduce collection of diffused charge. The effectiveness of the veto electrode has been studied via a coincidence analysis using IBIC. It has been shown that suppression of the shared events allows results in a better defined sensitive volume corresponding to the region under the core electrode where the electric field is strongest.
引用
收藏
页码:3126 / 3132
页数:7
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