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AbstractAbstract
[en] Using an elementary, but rigorous, analytical procedure and the calculations done by the CISI/Cadarache for various fractions of the 9Be (α,n) spectral distributions at energies below 1,5 MeV, we do confirm the results obtained in a previous report for the spectrum of the S.P.R. 241Am-Be reference source. The experimental data analysis obtained with the multisphere system and a miniaturized 3He counter at the center of the spheres gives a neutron fraction equal to: 0.215+-0.010. The standard deviation being given in excess. The maximal equivalent dose for this value is calculated equal to 3,64.10-8 (Rem.n-1.m2) at better than 1% in accordance with the mean value calculated and admitted at Oak Ridge in 1978
[fr]
Utilisant une procedure analytique simple, mais rigoureuse et les calculs effectues par la CISI/Cadarache pour differentes fractions neutroniques des distributions spectrales 9Be(α,n) aux energies inferieures a 1,5 MeV, nous confirmons les resultats obtenus dans un precedent rapport pour le spectre de la source de reference 241Am-Be du S.P.R. L'analyse des donnees experimentales obtenues avec le Systeme Multisphere muni du compteur miniaturise 3He central donne une fraction neutronique egale a: 0,215+-0,010. L'ecart type cite etant donne par exces. La dose maximale equivalente pour cette valeur a ete calculee egale a 3,64.10-8 (REM.n-1cm2) a mieux que 1% pres en accord avec la valeur moyenne calculee et admise a Oak Ridge en 1978Original Title
Programme Spheres - Determination de la fraction neutronique d'une source 241Am-Be pour Esub(n)<1,5 MeV. Application aux sources 9Be (α,n)
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Source
Nov 1981; 58 p
Record Type
Report
Report Number
Country of publication
ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, AMERICIUM ISOTOPES, BERYLLIUM ISOTOPES, DOSIMETRY, EVEN-ODD NUCLEI, HEAVY NUCLEI, ISOTOPES, LIGHT NUCLEI, MEASURING INSTRUMENTS, NEUTRON DETECTORS, NEUTRON SPECTROMETERS, NUCLEI, ODD-EVEN NUCLEI, PARTICLE SOURCES, PROPORTIONAL COUNTERS, RADIATION DETECTORS, RADIATION SOURCES, RADIOISOTOPES, SPECTRA, SPECTROMETERS, STABLE ISOTOPES, YEARS LIVING RADIOISOTOPES
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