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Register a new userAn Analytical Study of the Effect of Neutron Decay on the Flux of a Transient Neutron Beam for a Sample of Large Thickness
دراسة تحليلية لتأثير تفكك النيوترونات على تدفق حزمة نيوترونية عابرة لعينة ذات سماكة كبيرة
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إن العلاقة التحليلية التي تعطي تدفق الحزمة النيوترونية لا تأخذ بعين الاعتبار احتمال عدم التفكك بالحسبان. في هذا البحث، قمنا باستنتاج العلاقة التحليلية لاحتمال عدم تفكك النيوترون الحرّ في أثناء عبوره للعينة المراد تحليلها ب NAA. و استنتاج العلاقة التحليلية لاحتمال عدم أسر النيوترون الحرّ في أثناء عبوره للعينة المراد تحليلها ب NAA بطريقة أبسط من طريقة الاستنتاج السابقة. و قمنا بإجراء دراسة تطبيقية لمعرفة تأثير احتمال عدم تفكك النيوترونات الحرة العابرة للعينة على تدفق الحزم النيوترونية العابرة، من أجل عينة ذات سماكة كبيرة، و من أجل عينات مختلفة و من أجل طاقات مختلفة للنيوترونات، فتبين أن تأثير احتمال عدم تفكك النيوترون على تدفق الحزمة النيوترونية لا يمكن أن يكون مهملاً من أجل كافة الطاقات الأعلى من الحرارية.
The analytical relationship that gives the neutron beam flux does not take into account the probability of decay. In this research, we concluded the analytical relationship of the probability non decay of free neutron during the passage of the sample to be analyzed by NAA. And the conclusion of the analytical relationship to the probability of non-capture of the free neutron during the its passage of the sample to be analyzed by NAA in a simpler method than the previous conclusion. We conducted an application study to investigate the effect of the probability non decay of free neutrons, that flowing through sample, On the flux of transient neutron beam, for neutron beam with various large thickness samples and for different energies of neutrons. The effect of probability of neutron decay on neutron beam flux could not be negligible for all the energies which are bigger than of thermal.
References used
Hendrik Willem BAAS , Neutron Activation Analysis of Inhomogeneous Large Samples, op maandag 11 oktober 2004 om 13:00 uur
R. Khelifi,1* P. Bode,2 A. Amokrane3, Flux calculation in LSNAA using an 241Am–Be source, Journal of Radioanalytical and Nuclear Chemistry, Vol. 274, No.3 (2007) 639–642
F. Tzika and I. E Stamatelatos, MONTE CARLO SIMULATIONS FOR NON-DESTRUCTIVE ELEMENTAL ANALYSIS OF LARGE SAMPLES BY NEUTRON ACTIVATION ANALYSIS, ,Institute of Nuclear Technology and Radiation Protection, NCSR 'Demokritos', Greece, 11-14 October 2007, Chania, Crete, Greece
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