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Title: Characterization of the ADII-33 diamond detector

Abstract

Dosimetry characteristics of the ADII-33 diamond detector were investigated. Sensitivity, stability, bias voltage, hardening, dose rate, energy dependence, and spatial resolution were examined. Current generated in the detector was found to be proportional to the bias voltage applied to the detector with stability degrading as a function of the bias voltage. The average current increased with increasing bias voltage. The statistical fluctuation in current was less than 0.3% regardless of the applied bias voltage. The optimal bias voltage, at which the current uncertainty is negligible, was found to be 125{+-}25 V. The detector was hardened up to 85 kGy without significant degradation in output signal. A sub-linearity in the current as a function of dose rate was observed when the dose rate varied from 600.0 to 11.1 cGy/min. A fitting parameter of {delta}=0.978 was observed in the power relationship of I{proportional_to}D{sup {delta}}. When comparing the diamond detector readings to corrected ion chamber readings over a wide energy range of electron beams, differences of only 0.2% were observed suggesting no energy dependence for electron beam. PDD curves for a 10x10 cm{sup 2} field for 6 and 20 MV photon beams measured with the diamond detector and the farmer type ion chambermore » were also compared and they closely agreed up to a depth of 14 cm. Beyond a depth of 14 cm, diamond detector starts to overestimate the PDD curve reaching difference of 1.90% and 1.0% at 18 cm depth for 6 and 20 MV, respectively, to those values measured with the ion chamber. The diamond detector presents slightly better spatial resolution than the Exradin A16 micro-chamber. We conclude that at the optimal bias voltage, this new diamond detector is stable and the uncertainties in the current will not affect its suitability for clinical use. If compared against a calibrated ion chamber to correct any energy and dose rate dependence and considering any radiation damage effect, this diamond detector can be used to measure absolute and relative dose.« less

Authors:
; ; ;  [1];  [2];  [2]
  1. Department of Medical Physics, University of Wisconsin, Madison, 1530 MSC, 1300 University Avenue, Madison, Wisconsin 53706 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20853913
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 34; Journal Issue: 1; Other Information: DOI: 10.1118/1.2400832; (c) 2007 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; DIAMONDS; DOSE RATES; DOSIMETRY; ELECTRIC POTENTIAL; ELECTRON BEAMS; ENERGY DEPENDENCE; ERRORS; FLUCTUATIONS; IONIZATION CHAMBERS; PHOTON BEAMS; RADIOTHERAPY; SENSITIVITY; SPATIAL RESOLUTION

Citation Formats

Rodriguez, Manuel, Griffin, Sheridan, DeWerd, Larry, Jeraj, Robert, Radiation Calibration Lab, University of Wisconsin-Madison, 1530 MSC, 1300 University Avenue, Madison, Wisconsin, 53706, and Department of Medical Physics, University of Wisconsin, Madison, 1530 MSC, 1300 University Avenue, Madison, Wisconsin, 53706. Characterization of the ADII-33 diamond detector. United States: N. p., 2007. Web. doi:10.1118/1.2400832.
Rodriguez, Manuel, Griffin, Sheridan, DeWerd, Larry, Jeraj, Robert, Radiation Calibration Lab, University of Wisconsin-Madison, 1530 MSC, 1300 University Avenue, Madison, Wisconsin, 53706, & Department of Medical Physics, University of Wisconsin, Madison, 1530 MSC, 1300 University Avenue, Madison, Wisconsin, 53706. Characterization of the ADII-33 diamond detector. United States. doi:10.1118/1.2400832.
Rodriguez, Manuel, Griffin, Sheridan, DeWerd, Larry, Jeraj, Robert, Radiation Calibration Lab, University of Wisconsin-Madison, 1530 MSC, 1300 University Avenue, Madison, Wisconsin, 53706, and Department of Medical Physics, University of Wisconsin, Madison, 1530 MSC, 1300 University Avenue, Madison, Wisconsin, 53706. Mon . "Characterization of the ADII-33 diamond detector". United States. doi:10.1118/1.2400832.
@article{osti_20853913,
title = {Characterization of the ADII-33 diamond detector},
author = {Rodriguez, Manuel and Griffin, Sheridan and DeWerd, Larry and Jeraj, Robert and Radiation Calibration Lab, University of Wisconsin-Madison, 1530 MSC, 1300 University Avenue, Madison, Wisconsin, 53706 and Department of Medical Physics, University of Wisconsin, Madison, 1530 MSC, 1300 University Avenue, Madison, Wisconsin, 53706},
abstractNote = {Dosimetry characteristics of the ADII-33 diamond detector were investigated. Sensitivity, stability, bias voltage, hardening, dose rate, energy dependence, and spatial resolution were examined. Current generated in the detector was found to be proportional to the bias voltage applied to the detector with stability degrading as a function of the bias voltage. The average current increased with increasing bias voltage. The statistical fluctuation in current was less than 0.3% regardless of the applied bias voltage. The optimal bias voltage, at which the current uncertainty is negligible, was found to be 125{+-}25 V. The detector was hardened up to 85 kGy without significant degradation in output signal. A sub-linearity in the current as a function of dose rate was observed when the dose rate varied from 600.0 to 11.1 cGy/min. A fitting parameter of {delta}=0.978 was observed in the power relationship of I{proportional_to}D{sup {delta}}. When comparing the diamond detector readings to corrected ion chamber readings over a wide energy range of electron beams, differences of only 0.2% were observed suggesting no energy dependence for electron beam. PDD curves for a 10x10 cm{sup 2} field for 6 and 20 MV photon beams measured with the diamond detector and the farmer type ion chamber were also compared and they closely agreed up to a depth of 14 cm. Beyond a depth of 14 cm, diamond detector starts to overestimate the PDD curve reaching difference of 1.90% and 1.0% at 18 cm depth for 6 and 20 MV, respectively, to those values measured with the ion chamber. The diamond detector presents slightly better spatial resolution than the Exradin A16 micro-chamber. We conclude that at the optimal bias voltage, this new diamond detector is stable and the uncertainties in the current will not affect its suitability for clinical use. If compared against a calibrated ion chamber to correct any energy and dose rate dependence and considering any radiation damage effect, this diamond detector can be used to measure absolute and relative dose.},
doi = {10.1118/1.2400832},
journal = {Medical Physics},
number = 1,
volume = 34,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}