Results 141 to 150 of about 911 (181)

Epithermal neutron activation analysis

Journal of Radioanalytical and Nuclear Chemistry Articles, 1985
Different modes of epithermal neutron activation analysis are described. The principles and examples are given for each.
openaire   +1 more source

Enhanced plastic neutron shielding for thermal and epithermal neutrons

Journal of Instrumentation, 2008
We describe a compound made of paraffin and boron carbide (boraffin) deviced to enhance epithermal neutron shielding. The compound is easily prepared and is specially suited to be adapted to particular surfaces. Transmission experiments show a favourable comparison with a commercial rubber-boron carbide compound in the epithermal range.
L A Rodríguez Palomino, J J Blostein, J Dawidowski, G J Cuello   +3 more
openaire   +1 more source

The number of neutrons emitted by Pu239 upon thermal- and epithermal-neutron-induced upon thermal- and epithermal-neutron-induced fission

Journal of Nuclear Energy (1954), 1957
Abstract The mean number v of neutrons emitted during the fission of Pu233 by thermal and epithermal (0·15 to 0·5 eV) neutrons has been measured, and found to be the same within 2% for both cases.
V.I. Kalashnikov, V.I. Lebedev, L.A. Mikaelyan, M.I. Pevzner   +3 more
openaire   +1 more source

Activation analysis of human diet samples with epithermal neutrons

Biological Trace Element Research, 1990
Activation of diet samples by epithermal reactor neutrons is a very sensitive method for the determination of iodine. The method was developed and optimized for its determination. However, it turned out that with the same measurement valid results were also obtained for Br, Cl, K, Na, and P.
Tobler L, Furrer V, Wyttenbach A
openaire   +3 more sources

Contribution of epithermal activation in neutron in vivo activation

Physics in Medicine & Biology, 1976
It is pointed out that epithermal activation is not negligible in the in vivo neutron activation analysis (IVNAA) technique for the measurement of skeletal Ca. Multi-group calculations have been carried out to determine the ratio of epithermal to thermal flux and the epithermal activation was measured using the Cd subtraction technique.
Y S, Horowitz, A, Dubi, S, Mordechai
openaire   +2 more sources

Fast- and epithermal-neutron flux measurement

Nuclear Instruments and Methods, 1974
Abstract The feasibility of applying fission-produced 140 Ba to determine fast- and epithermal-neutron fluxes was investigated experimentally. 140 Ba decays by beta-ray emission with a half-life of 12.8 d 1 to 140 La. The absolute activity of 140 La calculated from the measured activity of the 1596.2 keV peak with a calibrated Ge(Li) detector ...
N. Lavi, Z. Fishelzon
openaire   +1 more source

Study of parity nonconversation with epithermal neutrons

SPIE Proceedings, 1997
I describe a new generation of experiments studying the weak interaction between nucleons. Measurements of the effect of this interaction are few in number and the significance of the observed effects are generally small. It is well known that the weak interaction violates parity. This was first experimentally established by C. S.
Susan J. Seestrom, J. David Bowman, B. E. Crawford, P. P. J. Delheij, T. Haseyama, J. N. Knudson, L. Y. Lowie, A. Masaike, Y. Matsuda, G. E. Mitchell, N. R. Roberson, S. Penttila, Yu P. Popov, H. Postma, E. I. Sharapov, Stanley W. Stephenson, Y. F. Yen, V. Yuan   +17 more
openaire   +1 more source

Epithermal Neutron Capture in Uranium-238

Nuclear Science and Engineering, 1977
Designers of thermal-neutron reactors have always had to adjust microscopic nuclear cross sections to predict neutron multiplication in slightly enriched uranium lattices.
H. I. Liou, R. E. Chrien
openaire   +1 more source

Design of a californium-based epithermal neutron beam for neutron capture therapy

Physics in Medicine and Biology, 1993
The potential of the spontaneously fissioning isotope, 252Cf, to provide epithermal neutrons for use in boron neutron capture therapy (BNCT) has been investigated using Monte Carlo simulation. The Monte Carlo code MCNP was used to design an assembly composed of a 26 cm long, 11 cm radius cylindrical D2O moderator followed by a 64 cm long Al filter ...
J C, Yanch, J K, Kim, M J, Wilson
openaire   +2 more sources

Accelerator‐based epithermal neutron beam design for neutron capture therapy

Medical Physics, 1992
Recent interest in the production of epithermal neutrons for use in boron neutron capture therapy (BNCT) has prompted an investigation into the feasibility of generating such neutrons with a high current proton accelerator. Energetic protons (2.5 MeV) on a 7Li target produce a spectrum of neutrons with maximum energy of roughly 800 keV.
J C, Yanch, X L, Zhou, R E, Shefer, R E, Klinkowstein   +3 more
openaire   +2 more sources