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Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy

Safe quality control of radiotherapy treatments lies in reliable dosimetric sensors. Currently, ionization chambers and solid-state diodes along with electrometers as readout systems are accomplishing this task. In this work, we present a well-known and low-cost semiconductor sensor, the light-depen...

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Autores principales: Román-Raya, Juan, Ruiz-García, Isidoro, Escobedo, Pablo, Palma, Alberto J., Guirado, Damián, Carvajal, Miguel A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7146615/
https://www.ncbi.nlm.nih.gov/pubmed/32168978
http://dx.doi.org/10.3390/s20061568
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author Román-Raya, Juan
Ruiz-García, Isidoro
Escobedo, Pablo
Palma, Alberto J.
Guirado, Damián
Carvajal, Miguel A.
author_facet Román-Raya, Juan
Ruiz-García, Isidoro
Escobedo, Pablo
Palma, Alberto J.
Guirado, Damián
Carvajal, Miguel A.
author_sort Román-Raya, Juan
collection PubMed
description Safe quality control of radiotherapy treatments lies in reliable dosimetric sensors. Currently, ionization chambers and solid-state diodes along with electrometers as readout systems are accomplishing this task. In this work, we present a well-known and low-cost semiconductor sensor, the light-dependent resistor (LDR), as an alternative to the existing sensing devices for dosimetry. To demonstrate this, a complete characterization of the response to radiation of commercial LDRs has been conducted in terms of sensitivity, reproducibility and thermal correction under different bias voltages. Irradiation sessions have been applied under the common conditions in radiotherapy treatments using a hospital linear accelerator. Moreover, the same electrometer used for the ionization chamber has also been successfully used for LDRs. In comparison with the sensitivity achieved for the ionization chamber (0.2 nC/cGy at 400 V bias voltage), higher sensitivities have been measured for the proposed LDRs, ranging from 0.24 to 1.04 nC/cGy at bias voltages from 30 to 150 V, with a reproducibility uncertainty among samples of around 10%. In addition, LDR temperature dependence has been properly modeled using the simple thermistor model so that an easy thermal drift correction of dose measurements can be applied. Therefore, experimental results show that LDRs can be a reliable alternative to dosimetric sensors with the advantages of low size, affordable cost and the fact that it could be adopted with minimal changes in routine dosimetry quality control since the same readout system is fully compatible.
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spelling pubmed-71466152020-04-20 Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy Román-Raya, Juan Ruiz-García, Isidoro Escobedo, Pablo Palma, Alberto J. Guirado, Damián Carvajal, Miguel A. Sensors (Basel) Article Safe quality control of radiotherapy treatments lies in reliable dosimetric sensors. Currently, ionization chambers and solid-state diodes along with electrometers as readout systems are accomplishing this task. In this work, we present a well-known and low-cost semiconductor sensor, the light-dependent resistor (LDR), as an alternative to the existing sensing devices for dosimetry. To demonstrate this, a complete characterization of the response to radiation of commercial LDRs has been conducted in terms of sensitivity, reproducibility and thermal correction under different bias voltages. Irradiation sessions have been applied under the common conditions in radiotherapy treatments using a hospital linear accelerator. Moreover, the same electrometer used for the ionization chamber has also been successfully used for LDRs. In comparison with the sensitivity achieved for the ionization chamber (0.2 nC/cGy at 400 V bias voltage), higher sensitivities have been measured for the proposed LDRs, ranging from 0.24 to 1.04 nC/cGy at bias voltages from 30 to 150 V, with a reproducibility uncertainty among samples of around 10%. In addition, LDR temperature dependence has been properly modeled using the simple thermistor model so that an easy thermal drift correction of dose measurements can be applied. Therefore, experimental results show that LDRs can be a reliable alternative to dosimetric sensors with the advantages of low size, affordable cost and the fact that it could be adopted with minimal changes in routine dosimetry quality control since the same readout system is fully compatible. MDPI 2020-03-11 /pmc/articles/PMC7146615/ /pubmed/32168978 http://dx.doi.org/10.3390/s20061568 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Román-Raya, Juan
Ruiz-García, Isidoro
Escobedo, Pablo
Palma, Alberto J.
Guirado, Damián
Carvajal, Miguel A.
Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy
title Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy
title_full Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy
title_fullStr Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy
title_full_unstemmed Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy
title_short Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy
title_sort light-dependent resistors as dosimetric sensors in radiotherapy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7146615/
https://www.ncbi.nlm.nih.gov/pubmed/32168978
http://dx.doi.org/10.3390/s20061568
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