PILE OSCILLATOR FOR THE MEASUREMENT OF NEUTRON ABSORPTION CROSS SECTIONS

Technical Report · Mon Dec 31 04:00:00 EST 1962

OSTI ID:4660097

Park, H I; Kim, I K; Yoon, B K

A local type pile oscillator designed and constructed at the Atomic Energy Research Institute, Republic of Korea, is described. A specimen and a standard mounted on a rod are oscillated through a cylindrical ion chamber located in the thermal column of the Triga Mark II reactor, and the current depressions from the ion chamber are compared to give the neutron absorption cross section of the specimen. Neutron sensitive ion chambers were constructed with two and three aluminum cylinders coated with boron, and the first chamber gave a saturation current of 5 microamp at a 100 kw reactor power. Neutron absorption signals from the ion chamber are integrated after being amplified by a narrow-band r-c amplifier, whose maximum gain was 13,000. An integrated signal of the neutron absorption by a 4 gram cadmium plate read 5 microamp after 40 oscillations, and that by a 1 gram gold foil read 0.2 mu amp. The original integrator circuit was modified to increase the output 40 times. (auth)

• Research Organization: Atomic Energy Research Inst., Seoul, Korea
• NSA Number: NSA-17-036967
• OSTI ID: 4660097
• Report Number(s): AERI-P/R-6
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
BORON
CADMIUM
CIRCUITS
COATING
CROSS SECTIONS
CURRENTS
FOILS
GOLD
IONIZATION CHAMBERS
MEASURED VALUES
MODERATORS
NEUTRONS
PLANNING
PLATES
REACTOR OSCILLATORS
REACTOR TECHNOLOGY
SIGNALS
STANDARDS
THERMAL COLUMN