Preparation Of A Mock Fission Neutron Source

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Preparation Of A Mock Fission Neutron Source

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Author : Don S. Martin
language : en
Publisher:
Release Date : 1951

Preparation Of A Mock Fission Neutron Source written by Don S. Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1951 with Neutron sources categories.

Preparation Properties And Availability Of Polonium Neutron Sources

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Author : U.S. Atomic Energy Commission
language : en
Publisher:
Release Date : 1952

Preparation Properties And Availability Of Polonium Neutron Sources written by U.S. Atomic Energy Commission and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1952 with Polonium categories.

Neutron Spectra From Mock Fission Sources

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Author : Eugene Tochilin
language : en
Publisher:
Release Date : 1958

Neutron Spectra From Mock Fission Sources written by Eugene Tochilin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1958 with Neutron flux categories.

Report For General Research January 8 To April 30 1951 Alpha Neutron Volume

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Author :
language : en
Publisher:
Release Date : 1951

Report For General Research January 8 To April 30 1951 Alpha Neutron Volume written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1951 with categories.

An experimental, gamma-sensitive, coaxial radioelectric cell has been tested by the Control Section. It was found to be as precise as the rotating sample gamma counter but much faster and simpler to operate. A gamma-sensitive, radioelectric cell of improved design has been constructed for the 'Y' Section. A neutron sensitive radioelectric cell has been tested over a range of pressures with various filling gases and with several combinations of hydrogenous electrode backings. Neutron to gamma discrimination ratios as high as 2,000 to 1 were obtained, A multiple electrode, alpha radiation, radioelectric cell using coated plastic electrodes gave increased current output, but the electrode life was quite short. Preliminary life tests indicated that aluminum electroscope foil would give excellent electrode life and techniques were worked out for making good electrodes of both aluminum and of gold electroscope foil. The vacuum-pressure gas system has been redesigned and completely rebuilt (p. 5) The fast-neutron scintillation counter is much smaller and lighter than a B-wall proportional counter and a large moderator. The former is more efficient for polonium-beryllium neutron sources but is less efficient for radium-beryllium neutron sources or for polonium sources producing lower energy neutrons The fast neutron scintillation counter would thus be very useful if the neutron to gamma discrimination ratio could be markedly improved. Preliminary experiments indicate that this ratio can be improved by carefully tailoring the frequency response characteristics of the amplifier used. Phosphors are also being investigated from the standpoint of improving this ratio. Preliminary attempts to detect neutrons by measuring the neutron-capture gamma of cadmium were unsuccessful. However, the conversion gamma from alpha-beryllium neutron sources can be detected with high efficiency; and this might be used to determine the neutron flux from such sources even in the presence of high backgrounds of lower energy gammas (p. 8). Maximum efficiency is obtained for polonium-beryllium neutron sources when the beryllium powder contains a minimum of oxide, when the polonium is 'shot' into the source container and when the curie-to gram-of-beryllium ratio is in the range of 5 to 11 (p. 11). Four mock-fission neutron sources have been prepared in an attempt to improve the efficiency which can be obtained by the evaporation technique (p. 13). A polonium-boron neutron source of unusually high efficiency has been made by the evaporative procedure. Two further attempts to prepare polonium-boron neutron sources by volatilization gave low efficiency (p. 14). Polonium, satisfactory for making neutron sources, has been reclaimed from large volumes of hydrochloric acid containing high concentrations of contaminating ions (p. 15). Work has continued on the problem of determining the total energy emitted from a covered alpha source. The effective thickness of a tantalum hold-down apparently, increases with time. If a source does not contaminate acetone after 24 hours immersion, it can be considered as being satisfactorily sealed. It is believed that a satisfactory seal of a tantalum hold-down to a gold plated source can be obtained by using a gold foil ring between the hold-down and the source, clamping to give pressure, and heating in a vacuum (P. 16).

Calibration Of A Mock Fission Neutron Source By Indium Resonance Mapping Of The Standard Graphite Pile

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Author : C. J. McDole
language : en
Publisher:
Release Date : 1956

Calibration Of A Mock Fission Neutron Source By Indium Resonance Mapping Of The Standard Graphite Pile written by C. J. McDole and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1956 with Indium categories.

Neutron Physics

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Author : Karl-Heinrich Beckurts
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29

Neutron Physics written by Karl-Heinrich Beckurts and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Science categories.

This book is based upon a series of lectures I have occasionally given at the University of Gottingen since 1951. They were meant to introduce the students of experimental physics to the work in a neutron physics laboratory dealing with the problem of measuring neutron flux, diffusion length, Fermi age, effective neutron temperature, absorption cross sections and similar problems. Moreover, these lectures were intended to prepare the students for a subsequent lecture covering the physics of nuclear reactors. The original character of this series of lectures has been retained in the book. It is intended for use by students as well as anyone desiring to work on neutron physics measurements. The first half mainly covers the theory of neutron fields, i. e. essentially diffusion and slowing down theory. The second half is largely concerned with measurements in neutron fields. The appendix contains information and data which, in our experience, are frequently required in a neutron laboratory. The field of nuclear physics proper is briefly touched upon in the first two chapters, but only to the extent necessary for the understanding of the following chapters. The multitude of applications of neutron radiation has not been covered. The conclusion of this manuscript coincided with the end of my long period of activity with the Max-Planck-Institut fur Physik at Gottingen. To Professor HEISENBERG lowe thanks for his advice and suggestions for many of the subjects treated here.

Tid

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Author :
language : en
Publisher:
Release Date : 19??

Tid written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 19?? with Energy development categories.

Nuclear Science

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Author : U.S. Atomic Energy Commission
language : en
Publisher:
Release Date : 1955

Nuclear Science written by U.S. Atomic Energy Commission and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1955 with Nuclear energy categories.

A total of 1517 references are listed in this compilation. These include selected non-published United States Atomic Energy Commission reports and published articles in technical books and journals. An author and a report number index with availability information are also included.

Nuclear Science Abstracts

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Author :
language : en
Publisher:
Release Date : 1975

Nuclear Science Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Nuclear energy categories.

Polonium

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Author : Harvey Vernon Moyer
language : en
Publisher:
Release Date : 1956

Polonium written by Harvey Vernon Moyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1956 with Science categories.