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Development of a gamma dosimeter using a photodiode; Desenvolvimento de um dosimetro para radiacao gama utilizando fotodiodo

Abstract

In the last years, the application of semiconductor detectors in radiation spectroscopy and dosimetry has increased. Silicon diodes have found utility in radiation dosimetry principally because a diode produces a current approximately 18000 times larger than of an ionization chamber of an equal sensitive volume. As the characteristics of the semiconductor detectors are the same as the common photodiode, a gamma dosimeter using this type of electronic component was developed. The photodiode SFH206 operating in photovoltaic mode was used. An electrometric unit was constructed to measure the current generated in this detector. The results obtained showed: the response of the photodiode was linear with the dose and that variation of 40 degrees in the incidence angle of the radiation caused a variation of 5% in the dose determination; the response reproducibility of the photodiode was studied, and the results showed that the variation coefficient is smaller than 0,02%; the small dimension of the silicon photodiode recommend its use as a gamma dosimeter for medical applications. (author). 19 refs, 32 figs, 1 tab.
Authors:
Publication Date:
May 01, 1988
Product Type:
Thesis/Dissertation
Report Number:
INIS-BR-3509
Reference Number:
SCA: 440102; PA: AIX-26:053246; EDB-95:092497; ERA-20:019328; NTS-96:003001; SN: 95001414208
Resource Relation:
Other Information: DN: PRONUCLEAR. Tese de Mestrado, 43.; TH: Tese (M.Sc.).; PBD: May 1988
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; SEMICONDUCTOR DEVICES; ELECTRIC MEASURING INSTRUMENTS; PHOTODIODES; DOSEMETERS; DOSIMETRY; ELECTROMETERS; GE SEMICONDUCTOR DETECTORS; LOW DOSE IRRADIATION; NUCLEAR MEDICINE; RADIATION DETECTORS; RADIATION DOSES; RADIOTHERAPY; SEMICONDUCTOR MATERIALS; SI SEMICONDUCTOR DETECTORS; SPECIFICATIONS
OSTI ID:
65451
Research Organizations:
Pernambuco Univ., Recife, PE (Brazil). Dept. de Energia Nuclear
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
Other: ON: DE95631486; TRN: BR9533229053246
Availability:
INIS; OSTI as DE95631486
Submitting Site:
INIS
Size:
81 p.
Announcement Date:

Citation Formats

Melo, F.A. de. Development of a gamma dosimeter using a photodiode; Desenvolvimento de um dosimetro para radiacao gama utilizando fotodiodo. Brazil: N. p., 1988. Web.
Melo, F.A. de. Development of a gamma dosimeter using a photodiode; Desenvolvimento de um dosimetro para radiacao gama utilizando fotodiodo. Brazil.
Melo, F.A. de. 1988. "Development of a gamma dosimeter using a photodiode; Desenvolvimento de um dosimetro para radiacao gama utilizando fotodiodo." Brazil.
@misc{etde_65451,
title = {Development of a gamma dosimeter using a photodiode; Desenvolvimento de um dosimetro para radiacao gama utilizando fotodiodo}
author = {Melo, F.A. de}
abstractNote = {In the last years, the application of semiconductor detectors in radiation spectroscopy and dosimetry has increased. Silicon diodes have found utility in radiation dosimetry principally because a diode produces a current approximately 18000 times larger than of an ionization chamber of an equal sensitive volume. As the characteristics of the semiconductor detectors are the same as the common photodiode, a gamma dosimeter using this type of electronic component was developed. The photodiode SFH206 operating in photovoltaic mode was used. An electrometric unit was constructed to measure the current generated in this detector. The results obtained showed: the response of the photodiode was linear with the dose and that variation of 40 degrees in the incidence angle of the radiation caused a variation of 5% in the dose determination; the response reproducibility of the photodiode was studied, and the results showed that the variation coefficient is smaller than 0,02%; the small dimension of the silicon photodiode recommend its use as a gamma dosimeter for medical applications. (author). 19 refs, 32 figs, 1 tab.}
place = {Brazil}
year = {1988}
month = {May}
}