Measurements of Neutron Radiation Around Medical Electron Accelerators by Means of 235U Fission Chamber and Indium Foil Activation

1988 ◽  
Vol 23 (1-4) ◽  
pp. 345-348 ◽  
Author(s):  
I. Gudowska
Keyword(s):  
Neutron Radiation ◽  
Indium Foil ◽  
Fission Chamber ◽  
Electron Accelerators ◽  
Foil Activation ◽  
235U Fission

Primary Ionization Density Produced by Charged Fragments in the Working Volume of the Fission Chambers

2021 ◽  
Vol 24 (4) ◽  
pp. 329-337
Author(s):  
A. A. Khrushchinsky ◽  
S. A. Kuten
Keyword(s):  
Spatial Distribution ◽  
Ion Pairs ◽  
Sensitive Volume ◽  
Active Volume ◽  
Fission Chamber ◽  
Ionization Density ◽  
Working Volume ◽  
Fission Chambers ◽  
235U Fission ◽  
Primary Ionization

The question of the spatial distribution of ion pairs created by 235U fission fragments in the active volume of the fission chamber has been studied. The formulas of the spatial distribution of ion pairs in cylindrical fission chambers are proposed, which allows you to evaluate correctly the density of ion pairs in any point in the sensitive volume of the fission chamber

scholarly journals Fast-Neutron Surveys Using Indium-Foil Activation

1958 ◽  
Author(s):  
Lloyd D. Stephens ◽  
Alan R. Smith
Keyword(s):  
Fast Neutron ◽  
Indium Foil ◽  
Foil Activation

scholarly journals Determination of the Thermal Neutron Flux by Measuring Gamma Radiations with High and Low Resolution Detectors

2019 ◽  
Vol 6 (2) ◽  
pp. 187-193
Author(s):  
M. M. Hosamani ◽  
A. S. Bennal ◽  
N. M. Badiger
Keyword(s):  
Neutron Flux ◽  
Thermal Neutron ◽  
Thermal Neutron Flux ◽  
High Energy ◽  
High Energy Resolution ◽  
Indium Foil ◽  
Hpge Detectors ◽  
Foil Activation ◽  
Gamma Radiations

Thermal neutron flux (Фth) of Americium-Beryllium (Am-Be) neutron source has been measured by adopting the foil activation method. The neutrons emitted from Am-Be source are used to activate the indium-115 (115In) foil. The gamma radiations emitted from the activated isomer 116m1In are measured with NaI(Tl) and HPGe detectors. The thermal neutron flux is measured by adopting the cadmium (Cd) foil difference technique in which the Cd foil placed in front of the source to prevent the thermal neutrons from entering into the indium foil. The neutron flux is determined by measuring the gamma radiation emitted from indium foil using a low and high energy resolution NaI(Tl) and HPGe detectors respectively. The measured thermal neutron flux obtained from both detectors has been compared and found that the Фth does not depend on the resolution and type of the detectors used in the present investigations.

A study of atmospheric neutrons by the resonance detector method

1968 ◽  
Vol 46 (10) ◽  
pp. S1038-S1040
Author(s):  
Yu. E. Efimov ◽  
A. M. Romanov
Keyword(s):  
Neutron Spectrum ◽  
Neutron Energy ◽  
Epithermal Neutron ◽  
Geomagnetic Latitude ◽  
Activation Method ◽  
Indium Foil ◽  
Lower Hemisphere ◽  
Epithermal Neutrons ◽  
Foil Activation ◽  
Detector Method

The possibilities and the conditions of using resonance detectors for investigation of slow neutrons in the atmosphere are discussed. The epithermal neutron fluxes from the lower hemisphere were measured by means of the indium foil activation method in June 1966 at the geomagnetic latitude 47°. Assuming the epithermal atmospheric neutron spectrum to be Φ(E) = Φ0/E and expressing the neutron energy in eV, we obtain the following values of Φ0 (neutron cm−2 s−1) from our measurements: 0.078 ± 0.019 (at a depth x = 40 g cm−2), 0.049 ± 0.015 (x = 22 g cm−2), 0.023 ± 0.010 (x = 8 g cm−2). It is pointed out that resonance detectors can be used to study the spectra of epithermal neutrons in nonequilibrium atmospheric layers.

Modeling of a highly enriched 235U fission chamber for spent fuel assay

2013 ◽  
Vol 62 ◽  
pp. 224-230 ◽  
Author(s):  
A. Borella ◽  
R. Rossa ◽  
K. van der Meer
Keyword(s):  
Spent Fuel ◽  
Fission Chamber ◽  
235U Fission

A new type of defect structure in 124-superconducting oxide revealed by HREM

1991 ◽  
Vol 49 ◽  
pp. 1092-1093
Author(s):  
R. Sharma ◽  
B.L. Ramakrishna ◽  
N.N. Thadhani ◽  
D. Hianes ◽  
Z. Iqbal
Keyword(s):  
Shock Wave ◽  
Defect Structure ◽  
Neutron Radiation ◽  
Weak Links ◽  
Defect Structures ◽  
New Materials ◽  
New Type ◽  
Current Densities ◽  
Processing Techniques ◽  
Microstructural Studies

After materials with superconducting temperatures higher than liquid nitrogen have been prepared, more emphasis has been on increasing the current densities (Jc) of high Tc superconductors than finding new materials with higher transition temperatures. Different processing techniques i.e thin films, shock wave processing, neutron radiation etc. have been applied in order to increase Jc. Microstructural studies of compounds thus prepared have shown either a decrease in gram boundaries that act as weak-links or increase in defect structure that act as flux-pinning centers. We have studied shock wave synthesized Tl-Ba-Cu-O and shock wave processed Y-123 superconductors with somewhat different properties compared to those prepared by solid-state reaction. Here we report the defect structures observed in the shock-processed Y-124 superconductors.

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