Abstract
Aluminium and copper have been determined in aluminium alloys by the method of activation with neutrons from an {sub 241} Am-Be source of intensity 9,8 x 10{sup 6} n/s. The activity induced due to reactions {sup 27} Al (n, {gamma}){sup 28} Al and {sup 63} Cu (n, {gamma}){sup 64} Cu have been measured with a NaI (Tl) detector coupled to a single channel system. In order to obtain the samples and standards of about the same composition, the material to be irradiated was powdered. In view of low intensity of neutron source it was necessary to use samples of up to 50 g. A series of preliminary irradiations were carried out to ensure that the geometry for the irradiation and for the counting are reproducible. The results have been compared with those obtained by chemical methods. Assuming that the results obtained by chemical method is exact, a maximum relative error of 3,6% is obtained by this method. The method has a good reproducibility. The time needed for analysis of aluminium and copper are 18 min and 2 hours 40 minutes respectively. Four different samples were analysed. The average of five measurements for one of the samples was: 88.0% for aluminium
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Citation Formats
Carvalho, J de.
Aluminium and copper analysis in metallic alloys by neutron activation analysis from an {sup 241} Am-Be source; Analise de Al e Cu em ligas metalicas por meio de ativacao com neutrons de uma fonte de {sup 241} Am-Be.
Brazil: N. p.,
1980.
Web.
Carvalho, J de.
Aluminium and copper analysis in metallic alloys by neutron activation analysis from an {sup 241} Am-Be source; Analise de Al e Cu em ligas metalicas por meio de ativacao com neutrons de uma fonte de {sup 241} Am-Be.
Brazil.
Carvalho, J de.
1980.
"Aluminium and copper analysis in metallic alloys by neutron activation analysis from an {sup 241} Am-Be source; Analise de Al e Cu em ligas metalicas por meio de ativacao com neutrons de uma fonte de {sup 241} Am-Be."
Brazil.
@misc{etde_10108435,
title = {Aluminium and copper analysis in metallic alloys by neutron activation analysis from an {sup 241} Am-Be source; Analise de Al e Cu em ligas metalicas por meio de ativacao com neutrons de uma fonte de {sup 241} Am-Be}
author = {Carvalho, J de}
abstractNote = {Aluminium and copper have been determined in aluminium alloys by the method of activation with neutrons from an {sub 241} Am-Be source of intensity 9,8 x 10{sup 6} n/s. The activity induced due to reactions {sup 27} Al (n, {gamma}){sup 28} Al and {sup 63} Cu (n, {gamma}){sup 64} Cu have been measured with a NaI (Tl) detector coupled to a single channel system. In order to obtain the samples and standards of about the same composition, the material to be irradiated was powdered. In view of low intensity of neutron source it was necessary to use samples of up to 50 g. A series of preliminary irradiations were carried out to ensure that the geometry for the irradiation and for the counting are reproducible. The results have been compared with those obtained by chemical methods. Assuming that the results obtained by chemical method is exact, a maximum relative error of 3,6% is obtained by this method. The method has a good reproducibility. The time needed for analysis of aluminium and copper are 18 min and 2 hours 40 minutes respectively. Four different samples were analysed. The average of five measurements for one of the samples was: 88.0% for aluminium and 10.0% for copper. The standard deviation and coefficient of variation were 0,8 and 1.0% for aluminium and 0,2 and 2.0% for copper. (author).}
place = {Brazil}
year = {1980}
month = {Dec}
}
title = {Aluminium and copper analysis in metallic alloys by neutron activation analysis from an {sup 241} Am-Be source; Analise de Al e Cu em ligas metalicas por meio de ativacao com neutrons de uma fonte de {sup 241} Am-Be}
author = {Carvalho, J de}
abstractNote = {Aluminium and copper have been determined in aluminium alloys by the method of activation with neutrons from an {sub 241} Am-Be source of intensity 9,8 x 10{sup 6} n/s. The activity induced due to reactions {sup 27} Al (n, {gamma}){sup 28} Al and {sup 63} Cu (n, {gamma}){sup 64} Cu have been measured with a NaI (Tl) detector coupled to a single channel system. In order to obtain the samples and standards of about the same composition, the material to be irradiated was powdered. In view of low intensity of neutron source it was necessary to use samples of up to 50 g. A series of preliminary irradiations were carried out to ensure that the geometry for the irradiation and for the counting are reproducible. The results have been compared with those obtained by chemical methods. Assuming that the results obtained by chemical method is exact, a maximum relative error of 3,6% is obtained by this method. The method has a good reproducibility. The time needed for analysis of aluminium and copper are 18 min and 2 hours 40 minutes respectively. Four different samples were analysed. The average of five measurements for one of the samples was: 88.0% for aluminium and 10.0% for copper. The standard deviation and coefficient of variation were 0,8 and 1.0% for aluminium and 0,2 and 2.0% for copper. (author).}
place = {Brazil}
year = {1980}
month = {Dec}
}