Author: Takashi EmotoPublisher:
ISBN:
Category :
Languages : en
Pages : 196
Book Description
Design, Construction and Testing of a Cold Neutron Beam Facility for the Cornell TRIGA Reactor
Author: Takashi EmotoThe Design and Construction of a Cold Neutron Source for Use in the Cornell University Triga Reactor
Author: Lydia Jane YoungPublisher:
ISBN:
Category : Neutron sources
Languages : en
Pages : 282
Book Description
Design, Construction, and Characterization of a Fast Neutron Beam Port Facility at the University of Texas at Austin TRIGA Reactor
Author: Daniel Caldwell BarronPublisher:
ISBN:
Category :
Languages : en
Pages : 518
Book Description
A fast neutron irradiation facility has been designed, modeled, and constructed in the beam port 4 facility at The University of Texas at Austin’s TRIGA Mark-II Reactor. This facility targets the Watt-fission neutron spectrum in a controlled environment by reducing the present thermal and epithermal flux while preserving the fast neutron flux. The present facility will open new avenues in nuclear non-proliferation for fast-fission yields in addition to measuring radionuclide migration. The filter system was designed using MCNP and Solidworks and consists of a lead plug to stop gamma-rays, filter elements of natural boron and 96% enriched B10, collimation elements of borated polyethylene and natural boron, and an exit filter of boron nitride. A beam stop was constructed to reduce the ambient dose rate using borated paraffin wax, polyethylene, cadmium, and lead. Sensitivity studies were performed to configure an economic facility by optimizing the amounts and configurations of materials used in the filter. The filter is modular to allow for rearrangement of elements and the ability to change the materials used as needed should higher efficiencies be desired or a higher total flux. Initial results indicate the facility produces a 10 cm diameter beam with an integrated flux of 6.63x105 n/cm2/s at a reactor power of 950 kW and resembles the Watt-fission spectrum well with a slightly elevated epithermal neutron flux. The fast neutron flux above 0.1 MeV constitutes 98.77% of the total flux and the thermal neutron flux only 0.0014% of the total flux. STAYSL PNNL was used to unfold the neutron spectrum from 9 measurable reactions in 5 flux foils. Results suggest that the fast neutron flux is higher than anticipated in all STAYSL runs although the total flux is lower than anticipated.
Initial Characterization of the Cornell Cold Neutron Source
Author: Stuart Alan SpernDesign, Construction and Characterization of an External Neutron Beam Facility at The Ohio State University Nuclear Reactor Laboratory
Author: Danyal J. TurkogluPublisher:
ISBN:
Category :
Languages : en
Pages : 93
Book Description
Abstract: The objective of this research was to bring a thermal neutron beam facility to the Ohio State University Nuclear Reactor Laboratory for the purposes of neutron-based research. The neutron beam is extracted from the reactor core through a neutron collimator emplaced in Beam Port #2, the radial beam port facing the core at a 30° angle. The collimator is an aluminum tube containing components designed to filter and shape the neutron beam. The filters are poly-crystalline bismuth (10.16 cm thickness, 12.7 cm diameter) for significantly reducing gamma ray content and single-crystal sapphire (12.7 cm thickness, 10.16 cm diameter) for preferentially passing thermal neutrons while scattering more energetic neutrons out of the beam. The thermal neutron beam is defined by multiple 3.0 cm diameter apertures in borated aluminum. Apertures in polyethylene-based disks and in Pb disks provide shielding for fast neutrons and gamma rays, respectively, in the neutron collimator. Characterization of the beam was performed using foil activation analysis to find the neutron flux and a low-cost digital neutron imaging apparatus to "see" the beam profile. The neutron collimator delivers the filtered thermal neutron beam with a 3.5 cm diameter umbra and a thermal neutron equivalent flux of (8.55 +̲ 0.19) x 106 cm−2s−1 at 450 kW reactor power (90% of rated limit) to the sample location. The beam is highly thermalized with a cadmium ratio of 266 +̲ 13. The facility was designed for neutron depth profiling, a nondestructive analytical technique for finding the concentration versus depth in the near surface (tens of microns) for isotopes that undergo charged particle emitting reactions, such as 10B(n, 4He)7Li, 6Li (n, 3H)4He, and 3He (n, 1H)3H, to name a few.
Design, Construction, and Demonstration of a Neutron Beamline and a Neutron Imaging Facility at a Mark-I TRIGA Reactor
Author: Aaron E. CraftPublisher:
ISBN:
Category : Neutron beams
Languages : en
Pages : 129
Book Description
Transactions of the American Nuclear Society
Author: Nuclear Science Abstracts
Author: Feasibility Study for Design and Utilization of a Cold Neutron Irradiation Facility at the JSI TRIGA Reactor
Author: Diego Martín Cuéllar FernándezPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Author: