the analysis of element and isotope composition by neutron spectroscopy method n.v. bazhazhina, yu....
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The analysis of element and isotope composition by
neutron spectroscopy method
N.V. Bazhazhina, Yu. D. Mareev, L.B. Pikelner, P.V. Sedyshev, V.N. Shvetsov
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research
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Excited states of compound nucleus
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Neutron transmission measurement
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Partial cross sections measurements
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IREN parameters
Peak current, A 3
Repetition rate, Hz 25
Electron pulse duration, ns 100
Electron energy, MeV 30
Neutron intensity, n/s 1011
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General view of the detector
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Request of Central Geological Laboratory of Mongolia
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Time-of-flight spectrum for sample from Mongolia
250 ns
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Amount of the element is determined by an intensity of the resonance area
- number of neutrons which crossed all area of the sample during measurement
- detection efficiency
- radiation width of the resonance
- total width of the resonance
- resonance area on the transmission curve,
where is defined as function of the resonance parameters and the sample thickness (nuclei/cm2).
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Used curves for the analysis of neutron resonances
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Results of analysis
ElementWeight of the element in
sample, g
Mass concentration of the element in sample, (g/kg)
Pt 2.7±0.3 180±20
Pd 0.1±0.02 6.7±1.34
Ir 5.2±0.6 347±40
Ru 1.14±0.2 76±13
Os 4.3±0.5 287±33
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Boron enriched unfired phosphate ceramics
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Determination of B content in composite material
1 1 2 20
exp[ ( ( ))]N
T n n EN
- the number of target nuclei per 1 cm2 , which do not have resonances and they have only the constant elastic cross section. - the number of target nuclei per 1 cm2 , which have the energy
dependence of the cross section.
))(exp()( i
tii EnET
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Determination of B content in composite material
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Determination of B content in composite material
Weight of sample, g.
, сm-2
Weight of in the sample, g
Weight of B in the sample, g
Weight%
4.88 1.7±0.2 0.22±0.03 1.08±0.13 22.1±2.7
2110Bn
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Thanks for your attention