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RISS 인기검색어
- 검색키워드
- 저자 : T. Akyurek (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Delayed fast neutron as an indicator of burn-up for nuclear fuel elements
Akyurek, T.,Shoaib, S.B.,Usman, S. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.10
Feasibility study of burn-up analysis and monitoring using delayed fast neutrons was investigated at Missouri University of Science and Technology Reactor (MSTR). Burnt and fresh fuel elements were used to collect delayed fast neutron data for different power levels. Total reactivity varied depending on the burn-up rate of fuel elements for each core configuration. The regulating rod worth was 2.07E-04 𝚫k/k/in and 1.95E-04 𝚫k/k/in for T121 and T122 core configurations at 11 inch, respectively. Delayed fast neutron spectrum of F1 (burnt) and F16 (fresh) fuel elements were analyzed further, and a strong correlation was observed between delayed fast neutron emission and burn-up. According to the analyzed peaks in burnt and fresh fuels, reactor power dependency was observed and it was determined that delayed neutron provided more reliable results at reactor powers of 50 kW and above.
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Determination of Plutonium and Uranium Content and Burnup Using Six Group Delayed Neutrons
T. Akyurek,S. Usman 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
In this study, investigation of spent fuel was performed using six group delayed neutron parameters. Three used fuels (F1, F2, and F11) which are burnt over the years in the core of Missouri University ofScience and Technology Reactor (MSTR), were investigated. F16 fresh fuel was used as plutonium freefuel element and compared with irradiated used fuels to develop burnup and Pu discrimination method. The fast fission factor of the MSTR was calculated to be 1.071 which was used for burnup calculations. Burnup values of F2 and F11 fuel elements were estimated to be 1.98 g and 2.7 g, respectively. 239Puconversion was calculated to be 0.36 g and 0.50 g for F2 and F11 elements, respectively
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A new dead-time determination method for gamma-ray detectors using attenuation law
T. Akyurek 한국원자력학회 2021 Nuclear Engineering and Technology Vol.53 No.12
This study presents a new dead-time measurement method using the gamma attenuation law andgeneralized dead-time models for nuclear gamma-ray detectors. The dead-time of the NaI(Tl) detectionsystem was obtained to validate the new dead-time determination method using very thin lead andpolyethylene absorbers. Non-paralyzing dead-time was found to be 8.39 ms, and paralyzing dead-timewas found to be 8.35 ms using lead absorber for NaI(Tl) scintillator detection system. These dead-timevalues are consistent with the previously reported dead-time values for scintillator detection systems. The gamma build-up factor's contribution to the dead-time was neglected because a very thin materialwas used.
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Voltage dependent pulse shape analysis of Geiger-Müller counter
B. Almutairi,T. Akyurek,S. Usman 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
Detailed pulse shape analysis of a Geiger-Müller counter is performed to understand the pulse shapedependence on operating voltage. New data is presented to demonstrate that not all pulses generated ina GM counter are identical. In fact, there is a strong correlation between the operating voltage and thepulse shape. Similar to detector deadtime, pulse shapes fall in three distinct regions. For low voltageregion, where deadtime was reported to reduce with increasing voltage, pulse generated in this regionwas observed to have a fixed pulse width with a variable tail. The pulse width and fall time of the tail wasobserved to be a function of applied voltage; exponentially reducing with increasing voltage with anexponent of negative 6E-04 and 2E-03 respectively. The second region showed a pulse without anysignificant tail. During this time the detector deadtime was earlier reported to be at its minimum. Thehighest voltage region demonstrated a different deadtime mechanism where the second pulse wasreduced in width. During this time the deadtime seemed to be increasing with increasing voltage. Thisdata allows us to gain some unique insight into the phenomenon of GM detector deadtime not reportedthus far.
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