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Estimation of the fractions of luminescence of water at higher energy than Cerenkov-light threshold for various types of radiation

Although the luminescence of water at a lower energy than the Cerenkov-light (CL) threshold has been found for various types of radiation, the fractions of the luminescence of water to the total produced light have not been obvious for radiations at a higher energy than the CL threshold because it i...

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Autores principales: Hirano, Yoshiyuki, Yamamoto, Seiichi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Society of Photo-Optical Instrumentation Engineers 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6977019/
https://www.ncbi.nlm.nih.gov/pubmed/31218874
http://dx.doi.org/10.1117/1.JBO.24.6.066005
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author Hirano, Yoshiyuki
Yamamoto, Seiichi
author_facet Hirano, Yoshiyuki
Yamamoto, Seiichi
author_sort Hirano, Yoshiyuki
collection PubMed
description Although the luminescence of water at a lower energy than the Cerenkov-light (CL) threshold has been found for various types of radiation, the fractions of the luminescence of water to the total produced light have not been obvious for radiations at a higher energy than the CL threshold because it is difficult to separate these two types of light. Thus, we used a Monte Carlo simulation to estimate the fractions of the luminescence of water for various types of radiation at a higher energy than the CL threshold to confirm the major component of the produced light. After we confirmed that the estimated light production of the luminescence of water could adequately simulate the experimental results, we calculated the produced light photons of this luminescence and the CL from water for protons (170 MeV), carbon ions (330 MeV/n), high-energy x-ray (6 MV) from a linear accelerator (LINAC), high-energy electrons (9 MeV) from LINAC, positrons (F-18, C-11, O-15, and N-13), and high-energy gamma photon radionuclides (Co-60). For protons, the major fraction of the produced light was the luminescence of water in addition to the CL from the prompt gamma photons produced by the nuclear interactions. For carbon ions, the major fraction of the produced light was the luminescence of water and the CL produced by the secondary electrons in addition to the prompt gamma photons produced by the nuclear interactions. For high-energy x-ray and electrons from LINAC, the fractions of luminescence of water were [Formula: see text] to 0.2%. The fractions of luminescence of water for positrons were 0.2% to 1.5% and that for Co-60 was 0.4%. We conclude that the major fractions of light produced from x-ray and electrons from LINAC, positron radionuclides, and the Co-60 source are CL, with fractions of the luminescence of water from [Formula: see text] to 1.5%.
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spelling pubmed-69770192020-02-03 Estimation of the fractions of luminescence of water at higher energy than Cerenkov-light threshold for various types of radiation Hirano, Yoshiyuki Yamamoto, Seiichi J Biomed Opt Imaging Although the luminescence of water at a lower energy than the Cerenkov-light (CL) threshold has been found for various types of radiation, the fractions of the luminescence of water to the total produced light have not been obvious for radiations at a higher energy than the CL threshold because it is difficult to separate these two types of light. Thus, we used a Monte Carlo simulation to estimate the fractions of the luminescence of water for various types of radiation at a higher energy than the CL threshold to confirm the major component of the produced light. After we confirmed that the estimated light production of the luminescence of water could adequately simulate the experimental results, we calculated the produced light photons of this luminescence and the CL from water for protons (170 MeV), carbon ions (330 MeV/n), high-energy x-ray (6 MV) from a linear accelerator (LINAC), high-energy electrons (9 MeV) from LINAC, positrons (F-18, C-11, O-15, and N-13), and high-energy gamma photon radionuclides (Co-60). For protons, the major fraction of the produced light was the luminescence of water in addition to the CL from the prompt gamma photons produced by the nuclear interactions. For carbon ions, the major fraction of the produced light was the luminescence of water and the CL produced by the secondary electrons in addition to the prompt gamma photons produced by the nuclear interactions. For high-energy x-ray and electrons from LINAC, the fractions of luminescence of water were [Formula: see text] to 0.2%. The fractions of luminescence of water for positrons were 0.2% to 1.5% and that for Co-60 was 0.4%. We conclude that the major fractions of light produced from x-ray and electrons from LINAC, positron radionuclides, and the Co-60 source are CL, with fractions of the luminescence of water from [Formula: see text] to 1.5%. Society of Photo-Optical Instrumentation Engineers 2019-06-19 2019-06 /pmc/articles/PMC6977019/ /pubmed/31218874 http://dx.doi.org/10.1117/1.JBO.24.6.066005 Text en © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
spellingShingle Imaging
Hirano, Yoshiyuki
Yamamoto, Seiichi
Estimation of the fractions of luminescence of water at higher energy than Cerenkov-light threshold for various types of radiation
title Estimation of the fractions of luminescence of water at higher energy than Cerenkov-light threshold for various types of radiation
title_full Estimation of the fractions of luminescence of water at higher energy than Cerenkov-light threshold for various types of radiation
title_fullStr Estimation of the fractions of luminescence of water at higher energy than Cerenkov-light threshold for various types of radiation
title_full_unstemmed Estimation of the fractions of luminescence of water at higher energy than Cerenkov-light threshold for various types of radiation
title_short Estimation of the fractions of luminescence of water at higher energy than Cerenkov-light threshold for various types of radiation
title_sort estimation of the fractions of luminescence of water at higher energy than cerenkov-light threshold for various types of radiation
topic Imaging
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6977019/
https://www.ncbi.nlm.nih.gov/pubmed/31218874
http://dx.doi.org/10.1117/1.JBO.24.6.066005
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