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The effect of dose enhancement near metal interfaces on synthetic diamond based X-ray dosimeters

Alamoudi, D, Lohstroh, Annika and Albarakaty, H (2017) The effect of dose enhancement near metal interfaces on synthetic diamond based X-ray dosimeters Radiation Physics and Chemistry.

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Abstract

This study investigates the effects of dose enhancement on the photocurrent performance at metallic interfaces in synthetic diamond detectors based X-ray dosimeters as a function of bias voltages. Monte Carlo (MC) simulations with the BEAMnrc code were carried out to simulate the dose enhancement factor (DEF) and compared against the equivalent photocurrent ratio from experimental investigations. The MC simulation results show that the sensitive region for the absorbed dose distribution covers a few micrometers distances from the interface. Experimentally, two single crystals (SC) and one polycrystalline (PC) synthetic diamond samples were fabricated into detectors with carbon based electrodes by boron and carbon ion implantation. Subsequently; the samples were each mounted inside a tissue equivalent encapsulation to minimize unintended fluence perturbation. Dose enhancement was generated by placing copper, lead or gold near the active volume of the detectors using 50 kVp and 100 kVp X-rays relevant for medical dosimetry. The results show enhancement in the detectors’ photocurrent performance when different metals are butted up to the diamond bulk as expected. The variation in the photocurrent measurement depends on the type of diamond samples, their electrodes’ fabrication and the applied bias voltages indicating that the dose enhancement near the detector may modify their electronic performance.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Alamoudi, DUNSPECIFIEDUNSPECIFIED
Lohstroh, AnnikaA.Lohstroh@surrey.ac.ukUNSPECIFIED
Albarakaty, HUNSPECIFIEDUNSPECIFIED
Date : 6 March 2017
Identification Number : 10.1016/j.radphyschem.2017.03.010
Copyright Disclaimer : © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Synthetic diamond; Monte Carlo (MC) simulation; Dose Enhancement Factor (DEF); Medical dosimetry
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 07 Mar 2017 18:16
Last Modified : 13 Sep 2017 15:00
URI: http://epubs.surrey.ac.uk/id/eprint/813707

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