Calibration of the irradiation channel DBVK at BER-II reactor and feasibility of applying the k0-method at this device

2003 ◽  
Vol 257 (3) ◽  
pp. 531-538 ◽  
Author(s):  
Xilei Lin ◽  
D. Alber ◽  
R. Henkelmann
Keyword(s):  
Irradiation Channel ◽  
K0 Method

Reevaluation of Spectral Parameters and Neutron Fluxes in IC-7 Irradiation Channel of TRIGA MARK I IPR-R1 Research Nuclear Reactor

2021 ◽  
Author(s):  
Radojko Jacimovic ◽  
Maria Angela de Barros Correia Menezes
Keyword(s):  
Nuclear Reactor ◽  
Epithermal Neutron ◽  
Research Reactor ◽  
Nuclear Research ◽  
Irradiation Channel ◽  
Spectral Parameters ◽  
K0 Method ◽  
Nuclear Research Reactor ◽  
Research Nuclear Reactor ◽  
The Stability

Abstract The core configuration of the TRIGA MARK I IPR-R1 nuclear research reactor, Brazil, has been modified six times since the first criticality and the neutron fluxes have been determined using experimental and semi theoretical methodologies determining the neutron fluxes in different irradiation channels and devices, applying different procedures and materials. This reactor operates at 100 kW, however, after new configuration for 250 kW in 2001, the carousel no longer rotates during irradiations aiming at preserving the rotation mechanism. In 2003, the spectral parameters were determined experimentally by the "Cd-ratio for multi-monitor" in five specific channels aiming at the application of NAA k0-standardized method. The determinations were repeated applying the same procedure in 2016, 2018 and 2019. Values for thermal and epithermal neutron fluxes as well as f and a spectral parameters were determined. The experimental results for CRM BCR-320R were calculated by the k0-method of NAA, using the spectral parameters for irradiation channel IC-7 obtained in 2003, 2016, 2018 and 2019 and evaluated by En-score. The values showed that the differences in the results compared to those in 2003 were lower than 2.5%, inside the uncertainty of the method. It shows that the k0-method installed in CDTN is reliable and useful for various purposes. The results of the spectral parameter f presented small differences, in a period of 16 years, pointing out the stability of operation of the reactor TRIGA MARK I IPR-R1.

scholarly journals Determination of α in the Cadmium Lined Irradiation Channel of the NIRR-1 for Use in <i>k<sub>o</sub></i>-ENAA

2015 ◽  
Vol 05 (03) ◽  
pp. 233-240
Author(s):  
F. T. Sheyin ◽  
M. O. A. Oladipo ◽  
S. A. Jonah ◽  
U. Sadiq
Keyword(s):  
Irradiation Channel

scholarly journals Innovative hybrid pile oscillator technique in the Minerve reactor: open loop vs. closed loop

2018 ◽  
Vol 170 ◽  
pp. 04009
Author(s):  
Benoit Geslot ◽  
Adrien Gruel ◽  
Stéphane Bréaud ◽  
Pierre Leconte ◽  
Patrick Blaise
Keyword(s):  
Cross Sections ◽  
Closed Loop ◽  
High Sensitivity ◽  
Nuclear Data ◽  
Open Loop ◽  
Hybrid Technique ◽  
Irradiation Channel ◽  
Data Improvement ◽  
Neutron Cross Sections ◽  
Fission Chambers

Pile oscillator techniques are powerful methods to measure small reactivity worth of isotopes of interest for nuclear data improvement. This kind of experiments has long been implemented in the Mineve experimental reactor, operated by CEA Cadarache. A hybrid technique, mixing reactivity worth estimation and measurement of small changes around test samples is presented here. It was made possible after the development of high sensitivity miniature fission chambers introduced next to the irradiation channel. A test campaign, called MAESTRO-SL, took place in 2015. Its objective was to assess the feasibility of the hybrid method and investigate the possibility to separate mixed neutron effects, such as fission/capture or scattering/capture. Experimental results are presented and discussed in this paper, which focus on comparing two measurements setups, one using a power control system (closed loop) and another one where the power is free to drift (open loop). First, it is demonstrated that open loop is equivalent to closed loop. Uncertainty management and methods reproducibility are discussed. Second, results show that measuring the flux depression around oscillated samples provides valuable information regarding partial neutron cross sections. The technique is found to be very sensitive to the capture cross section at the expense of scattering, making it very useful to measure small capture effects of highly scattering samples.

Pneumatic irradiation channel reloading system for the IRT-M reactor

1971 ◽  
Vol 31 (2) ◽  
pp. 860-863
Author(s):  
T. S. Ambardanshvili ◽  
G. V. Zakomornyi ◽  
G. D. Kiasashvili ◽  
G. I. Kiknadze ◽  
B. I. Litvinov ◽  
...  
Keyword(s):  
Irradiation Channel

scholarly journals Monitoring of the morphologic reconstruction of deposited ablation products in laser irradiation of silicon

2008 ◽  
Vol 40 (1) ◽  
pp. 69-78 ◽  
Author(s):  
M. Vlasova ◽  
Márquez Aguilar ◽  
M.C. Reséndiz-González ◽  
M. Kakazey ◽  
V. Stetsenko ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Heating Temperature ◽  
Composite Films ◽  
Target Surface ◽  
Oxygen Impurity ◽  
Irradiation Channel ◽  
Force Microscopy ◽  
Atomic Force ◽  
Gaseous Atmospheres ◽  
Main Components

Using electron microscopy, atomic force microscopy, X-ray microanalysis, and IR spectroscopy, it was established that, in the regime of continuous laser irradiation of silicon at P = 170 W in different gaseous atmospheres with an oxygen impurity, SiOx composite films with a complex morphology form. The main components of ablation products are clusters that form during flight of ablation products and as a result of separation of SiOx-clusters from the zone of the irradiation channel. The roughness and density of the films depend on the heating temperature of the target surface and the type of deposited clusters.

Is the k0 method accurate for elements with high Q0 values?

2003 ◽  
Vol 257 (3) ◽  
pp. 475-480 ◽  
Author(s):  
G. Kennedy ◽  
J. St-Pierre
Keyword(s):  
K0 Method
Sign in / Sign up

Export Citation Format

Share Document