POLYETHYLENE FILTER FOR THE TNF2 THERMAL NEUTRON FACILITY-Reference-Cited by-同舟云学术

POLYETHYLENE FILTER FOR THE TNF2 THERMAL NEUTRON FACILITY

Published:2022-12-14 Issue:3 Volume:199 Page:187-190
ISSN:0144-8420
Container-title:Radiation Protection Dosimetry
language:en
Short-container-title:

Author:

Astuto Achilles¹^ORCID,Patrão Karla C S²,Fonseca Evaldo S²,Pereira Walsan W²,Lopes Ricardo T¹

Affiliation:

1. Universidade Federal do Rio de Janeiro – COPPE/UFRJ. Av. Horácio Macedo, 2030, Bloco G/Sala 206 – Centro de Tecnologia – Cidade Universitária, Ilha do Fundão , Rio de Janeiro 21941-914, RJ, Brasil

2. Laboratório Nacional de Metrologia das Radiações Ionizantes LNMRI/IRD. Av. Salvador Allende, s/n, Barra da Tijuca , Rio de Janeiro 22783-127, RJ, Brasil

Abstract

Abstract The Standard Thermal Neutron Flux Unit, TNF2, in (LNMRI/IRD)(1, 2), was built for neutron detector and survey meter calibrations. The facility’s fluence is achieved by moderation of four 241Am-Be with a graphite core and paraffin/graphite blocks surrounding it. Due to the small channel dimensions, it is impossible to calibrate personal dosemeters and survey meters for thermal neutrons. A polyethylene filter construction was carried out to allow the external irradiation of personal dosemeters and neutron survey meters. The polyethylene filter was constructed with 29 stacked discs with diameters ranging from 5 to 34 cm. Different thicknesses were simulated to provide the desired effect. This new irradiation configuration was also experimentally tested and compared with simulation results with MCNPX(3).

Publisher

Oxford University Press (OUP)

Subject

Public Health, Environmental and Occupational Health,Radiology, Nuclear Medicine and imaging,General Medicine,Radiation,Radiological and Ultrasound Technology

Link

https://academic.oup.com/rpd/article-pdf/199/3/ncac255%09187%09190/49529943/ncac255.pdf

Reference7 articles.

1. Improvements in the thermal neutron calibration unit, TNF2, at LNMRI/IRD;Astuto;Radiat. Prot. Dosim.,2018

2. Developing a thermal neutron irradiation system for the calibration of personal dosemeters in terms of Hp(10);Gualdrini;Radia. Prot. Dosim.,2004

3. Reference neutron radiations, Part 1: characteristics and method of production;International Organization for standardization

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