CVD Diamond dosimeters response in strong magnetic fields: Monte Carlo and experimental study.

A. GAYOL; R. HUGTENBURG; G. MORGAN; M. VALENTE

Zacatecas

Congreso; ISSSD 2021 - Int. Symposium of Solid State Dosimetry; 2021

Univ. Zacatecas & Soc. Mex de Dosim.

CVD Diamond dosimeters response in strong magnetic fields:Monte Carlo and experimental studyAmiel Gayol1,2,*, Richard Hugtenburg3,4, Gavin Morgan3 & Mauro Valente1,2,51Instituto de Física E. Gaviola, IFEG, CONICET, Córdoba; Argentina2Laboratorio de Investigación e Instrumentación en Física Aplicada a la Medicina e Imágenes porRayos X, LIIFAMIRX, FAMAF, Universidad Nacional de Córdoba, Córdoba; Argentina3Swansea University, Singleton Park Campus, Sketty, Swansea, SA2 8PP; United Kingdom4Singleton Hospital, Swansea Bay University Health Board, Swansea, SA2 8QA; United Kingdom5Centro de excelencia en Física e Ingeniería en Salud, CFIS, Universidad de La Frontera, Temuco;Chile*Email: amielgayol@mi.unc.edu.arAbstractMRI-LINAC devices incorporate magnetic resonance scanners to clinical linearaccelerators, constituting an advanced form of image-guided radiation therapy. When MRIis used as part of radiotherapy treatments, adequate detectors for effective dosimetry mustbe used [1]. Diamond solid-state dosimeters fulfill the requirements since they are neartissue equivalent, chemically inert, non-toxic and highly resistant to radiation [2]. Sincenatural diamond crystals with these desired properties are rare and expensive [3], thepractical use of diamond as detector material has been made possible by advances in thesingle crystal chemical vapor deposition (SC CVD) growth process. This technique allowsdiamonds to be produced economically over a large area and with high purity [4]. Thiswork investigates the SC CVD detector response to different strengths and orientations ofmagnetic fields, similar to those used in the MRI-LINAC devices, being irradiated by ameans of a 6 MV photon beam. A comparison of field strength over measured dose isprovided, with results obtained from experimental measurements and from Monte Carlosimulations with the PENELOPE code. Numerical results are in agreement with themeasured ones, and a decrease in measured dose with increasing field strength wasobserved.[1] Morgan, G. DEVELOPMENT OF DIAMOND DOSIMETERS FOR REAL-TIME DOSIMETRY,Swansea University, (2019).[2] Betzel G.T. et al. (2012). Physica Medica 28: 144-152.[3] Burgemeister EA. (1981). Physics Medicine and Biology 26(2): 269-275.[4] Meier D. CVD DIAMOND SENSORS FOR PARTICLE DETECTION AND TRACKING, CERN,(1999).Keywords: CVD dosimeters; Magnetic fields; Monte Carlo simulations.