Absolute Yield of Radium-Beryllium Neutron Source; IJKING VAN EEN RADIUM-BERYLLIUM NEUTRONENBRON. (Thesis)

Technical Report · Fri Jul 01 04:00:00 EDT 1960

OSTI ID:4007771

Vasmel, J J

The investigation was undertaken to obtain a neutron standard by measuring the absolute yield of a Ra-Be source containing 98.44 mg radium (as RaBr/sub 2/) mixed with 500 mg of beryllium. The neutrons from the source were slowed down to thermal energies in water and boric acid solutions and were detected with a small ionization chamber. It was necessary to discriminate against noise from the amplifiers and the pulses resulting from the gamma - background of the source, and, to prevent piling up of the gammas, fast counting techniques were used. A calculation was made of the pulse spectrum of the ionization chamber. A description is given of the corrections which must be determined to find the total number of neutrons emitted by the source from the measurements of the neutron density in the medium. The source yield was determined as 946. x lO/sup 3/ ( plus or minus 2.2%) neutrons per sec. (auth)

• Research Organization: Amsterdam. Vrije Universiteit
• NSA Number: NSA-15-018720
• OSTI ID: 4007771
• Report Number(s): NP-9965
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BACKGROUND
BERYLLIUM
BORON OXIDES
EFFICIENCY
ERRORS
GAMMA RADIATION
IONIZATION CHAMBERS
MEASURED VALUES
NEUTRON DETECTION
NEUTRON SOURCES
NUMERICALS
PHYSICS
PULSES
RADIUM
RADIUM BROMIDES
SLOWDOWN
SPECTRA
STANDARDS
WATER