Publication Date:
2018-06-16
Description:
Publication date: Available online 14 June 2018 Source: Radiation Measurements Author(s): Linh T. Tran, Lachlan Chartier, David Bolst, Jeremy Davis, Dale A. Prokopovich, Alex Pogossov, Susanna Guatelli, Mark I. Reinhard, Marco Petasecca, Michael L.F. Lerch, Naruhiro Matsufuji, Marco Povoli, Anand Summanwar, Angela Kok, Michael Jackson, Anatoly B. Rosenfeld This paper presents recent development of Silicon on Insulator (SOI) detectors for microdosimetry at the Centre for Medical Radiation Physics (CMRP) at the University of Wollongong. A new CMRP SOI microdosimeter design, the 3D mushroom microdosimeter is presented. Modification of SOI design and changes to the fabrication processes have led to improved definition of the microscopic sensitive volumes (SV), and thus to better modelling of the deposition of ionizing energy in a biological cell. The electrical and charge collection properties of the devices have been presented in previous works. In this study, the response of the microdosimeters in monoenergetic and spread out Bragg peak therapeutic 12 C ion beam at Heavy Ion Medical Accelerator in Chiba (HIMAC, Japan) are presented. Derived relative biological effectiveness (RBE) in 12 C ion radiation therapy matches the tissue equivalent proportional counter (TEPC) well, along with outstanding spatial resolution. The use of SOI technology in experimental microdosimetry offers simplicity (no gas system or HV supply), high spatial resolution, low cost, high count rates capabilities for beam characterisation and quality assurance (QA) in charged particle therapy.
Print ISSN:
1350-4487
Electronic ISSN:
1879-0925
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
