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Electret ionization chamber: a new method for detection and dosimetry of thermal neutrons; Camara de ionizacao de eletretos: um novo metodo para deteccao e dosimetria de neutrons termicos

Abstract

An electret ionization chamber with boron coated walls is presented as a new method for detecting thermal neutrons. The efficiency of electret ionization chambers with different wall materials for the external electrode was inferred from the results. Detection of slow neutrons with discrimination against the detection of {gamma}-rays and energetic neutrons was shown to depend on the selection of these materials. The charge stability over a long period of time and the charge decay owing to natural radiation were also studied. Numerical analysis was developed by the use of a micro-computer PC-XT. Both the experimental and numerical results show that the sensitivity of the electret ionization chamber for detection of thermal neutrons is comparable with that of the BF{sub 3} ionization chamber and that new technologies for deposition of the boron layer will produce higher efficiency detectors. (author). 102 refs, 32 fig, 10 tabs.
Authors:
Publication Date:
Dec 31, 1988
Product Type:
Miscellaneous
Report Number:
INIS-BR-3491
Reference Number:
SCA: 440101; PA: AIX-26:041870; EDB-95:072605; ERA-20:016408; NTS-95:021967; SN: 95001382300
Resource Relation:
Other Information: TH: Tese (Ph.D.).; PBD: 1988
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; BORON COATED ION CHAMBERS; ELECTRETS; NEUTRON DETECTION; DIAGRAMS; EXPERIMENTAL DATA; MATHEMATICS; MICROCOMPUTERS; NEUTRON DOSIMETRY; NUMERICAL ANALYSIS; PERFORMANCE; SPECIFICATIONS; THERMAL NEUTRONS
OSTI ID:
38162
Research Organizations:
Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Fisica e Quimica
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
Other: ON: DE95627022; TRN: BR9532985041870
Availability:
INIS; OSTI as DE95627022
Submitting Site:
INIS
Size:
153 p.
Announcement Date:

Citation Formats

Ghilardi, A J.P. Electret ionization chamber: a new method for detection and dosimetry of thermal neutrons; Camara de ionizacao de eletretos: um novo metodo para deteccao e dosimetria de neutrons termicos. Brazil: N. p., 1988. Web.
Ghilardi, A J.P. Electret ionization chamber: a new method for detection and dosimetry of thermal neutrons; Camara de ionizacao de eletretos: um novo metodo para deteccao e dosimetria de neutrons termicos. Brazil.
Ghilardi, A J.P. 1988. "Electret ionization chamber: a new method for detection and dosimetry of thermal neutrons; Camara de ionizacao de eletretos: um novo metodo para deteccao e dosimetria de neutrons termicos." Brazil.
@misc{etde_38162,
title = {Electret ionization chamber: a new method for detection and dosimetry of thermal neutrons; Camara de ionizacao de eletretos: um novo metodo para deteccao e dosimetria de neutrons termicos}
author = {Ghilardi, A J.P.}
abstractNote = {An electret ionization chamber with boron coated walls is presented as a new method for detecting thermal neutrons. The efficiency of electret ionization chambers with different wall materials for the external electrode was inferred from the results. Detection of slow neutrons with discrimination against the detection of {gamma}-rays and energetic neutrons was shown to depend on the selection of these materials. The charge stability over a long period of time and the charge decay owing to natural radiation were also studied. Numerical analysis was developed by the use of a micro-computer PC-XT. Both the experimental and numerical results show that the sensitivity of the electret ionization chamber for detection of thermal neutrons is comparable with that of the BF{sub 3} ionization chamber and that new technologies for deposition of the boron layer will produce higher efficiency detectors. (author). 102 refs, 32 fig, 10 tabs.}
place = {Brazil}
year = {1988}
month = {Dec}
}