A modular neutron irradiator based on 241Am-Be neutron sources

Risultato della ricerca: Paper

Abstract

Neutron irradiator facilities with 241Am-Be sources are worldwide used in order to perform neutron activation analysis (NAA), to investigate materials in different research areas or to test and calibrate neutron detectors and environmental or personal dosemeters. The use of a neutron irradiator is advantageous because of its very stable neutron flux, even it is many orders of magnitude lower than the one of a nuclear reactor or a particle accelerator. Most of irradiators are realized with neutron sources located at fixed positions and accordingly the characteristics of neutron spectrum previously assessed do not change. Therefore, an interesting choice is to have a modular facility, capable of varying conditions of irradiation and setting the prevalence of fast or thermal neutron spectrum component. In this work we describe the design and the realization process of a new modular 241Am-Be neutron irradiator in order to obtain a neutron energy distribution useful to test neutron detectors or personal dosemeters. Some of the useful calculations oriented to optimize thicknesses and shape of the moderators and shielding materials were obtained with a Monte Carlo simulation with MCNP5 code. The new modular neutron irradiator will provide an useful facility for radiochemical material studying and testing and calibration of personal dosemeters or neutron measurement equipments. Irradiation tests and neutron fluxes measurements by using various measurement devices, as activation materials, irradiation of bare and cadmium covered gold foils, bubble dosemeters, are also reported.
Lingua originaleEnglish
Stato di pubblicazionePublished - 2010

Fingerprint

neutron sources
neutrons
neutron counters
neutron spectra
flux (rate)
irradiation
neutron activation analysis
moderators
particle accelerators
nuclear reactors
fast neutrons
thermal neutrons
cadmium
shielding
foils
energy distribution
bubbles
activation
gold
simulation

Cita questo

@conference{80e3c708c01a4af6bf0af87a109e3cf3,
title = "A modular neutron irradiator based on 241Am-Be neutron sources",
abstract = "Neutron irradiator facilities with 241Am-Be sources are worldwide used in order to perform neutron activation analysis (NAA), to investigate materials in different research areas or to test and calibrate neutron detectors and environmental or personal dosemeters. The use of a neutron irradiator is advantageous because of its very stable neutron flux, even it is many orders of magnitude lower than the one of a nuclear reactor or a particle accelerator. Most of irradiators are realized with neutron sources located at fixed positions and accordingly the characteristics of neutron spectrum previously assessed do not change. Therefore, an interesting choice is to have a modular facility, capable of varying conditions of irradiation and setting the prevalence of fast or thermal neutron spectrum component. In this work we describe the design and the realization process of a new modular 241Am-Be neutron irradiator in order to obtain a neutron energy distribution useful to test neutron detectors or personal dosemeters. Some of the useful calculations oriented to optimize thicknesses and shape of the moderators and shielding materials were obtained with a Monte Carlo simulation with MCNP5 code. The new modular neutron irradiator will provide an useful facility for radiochemical material studying and testing and calibration of personal dosemeters or neutron measurement equipments. Irradiation tests and neutron fluxes measurements by using various measurement devices, as activation materials, irradiation of bare and cadmium covered gold foils, bubble dosemeters, are also reported.",
keywords = "Irradiatore neutronico; sorgenti Am-Be",
author = "Salvatore Rizzo and Tomarchio, {Elio Angelo} and Pietro Buffa",
year = "2010",
language = "English",

}

TY - CONF

T1 - A modular neutron irradiator based on 241Am-Be neutron sources

AU - Rizzo, Salvatore

AU - Tomarchio, Elio Angelo

AU - Buffa, Pietro

PY - 2010

Y1 - 2010

N2 - Neutron irradiator facilities with 241Am-Be sources are worldwide used in order to perform neutron activation analysis (NAA), to investigate materials in different research areas or to test and calibrate neutron detectors and environmental or personal dosemeters. The use of a neutron irradiator is advantageous because of its very stable neutron flux, even it is many orders of magnitude lower than the one of a nuclear reactor or a particle accelerator. Most of irradiators are realized with neutron sources located at fixed positions and accordingly the characteristics of neutron spectrum previously assessed do not change. Therefore, an interesting choice is to have a modular facility, capable of varying conditions of irradiation and setting the prevalence of fast or thermal neutron spectrum component. In this work we describe the design and the realization process of a new modular 241Am-Be neutron irradiator in order to obtain a neutron energy distribution useful to test neutron detectors or personal dosemeters. Some of the useful calculations oriented to optimize thicknesses and shape of the moderators and shielding materials were obtained with a Monte Carlo simulation with MCNP5 code. The new modular neutron irradiator will provide an useful facility for radiochemical material studying and testing and calibration of personal dosemeters or neutron measurement equipments. Irradiation tests and neutron fluxes measurements by using various measurement devices, as activation materials, irradiation of bare and cadmium covered gold foils, bubble dosemeters, are also reported.

AB - Neutron irradiator facilities with 241Am-Be sources are worldwide used in order to perform neutron activation analysis (NAA), to investigate materials in different research areas or to test and calibrate neutron detectors and environmental or personal dosemeters. The use of a neutron irradiator is advantageous because of its very stable neutron flux, even it is many orders of magnitude lower than the one of a nuclear reactor or a particle accelerator. Most of irradiators are realized with neutron sources located at fixed positions and accordingly the characteristics of neutron spectrum previously assessed do not change. Therefore, an interesting choice is to have a modular facility, capable of varying conditions of irradiation and setting the prevalence of fast or thermal neutron spectrum component. In this work we describe the design and the realization process of a new modular 241Am-Be neutron irradiator in order to obtain a neutron energy distribution useful to test neutron detectors or personal dosemeters. Some of the useful calculations oriented to optimize thicknesses and shape of the moderators and shielding materials were obtained with a Monte Carlo simulation with MCNP5 code. The new modular neutron irradiator will provide an useful facility for radiochemical material studying and testing and calibration of personal dosemeters or neutron measurement equipments. Irradiation tests and neutron fluxes measurements by using various measurement devices, as activation materials, irradiation of bare and cadmium covered gold foils, bubble dosemeters, are also reported.

KW - Irradiatore neutronico; sorgenti Am-Be

UR - http://hdl.handle.net/10447/58907

M3 - Paper

ER -