A New Detector for the Measurement of Neutron Flux in Nuclear Reactors; NOUVELLE METHODE DE MESURE DES FLUX DE NEUTRONS DANS LES REACTEURS ATOMIQUES

Technical Report · Sat Oct 31 04:00:00 EST 1959

OSTI ID:4287607

Koch, L; Labeyrie, J; Tarassenko, S

The detector described is designed for the instantaneous measurement of thermal neutron fluxes, in the presence of high gamma activity; this detector can withstand temperatures as high as 500 deg C. It is based on the principle that radioactive atoms resulting from heavynucleus fission in the detector are carried by a gas flow to a detector recording their BETA and gamma desintegration. Thermal neutron fluxes as low as few neutrons per cm/sup 2/ per second can be measured. This detector may be used to control a nuclear reactor and to plot the thermal fiux distribution with an excellent definition (1 mm/sup 2/) for fluxes higher than 10/sup 8/n/cm/sup 2//sec. The time response of the system to a sharp variation of flux is limited, in the case of large fluxes, to the transit time of the gas flow between the fission product emitter and the detector; of the order of one tenth of a sec per meter of piping. The detector may also be used for spectroscopy of fission products older than 0.1 sec. (auth)

• Research Organization: Commissariat a l'Energie Atomique, Paris
• NSA Number: NSA-13-006724
• OSTI ID: 4287607
• Report Number(s): A/CONF.15/P/1207
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ATOMS
BACKGROUND
BETA DETECTION
CONTROL SYSTEMS
DECAY
DISTRIBUTION
EFFICIENCY
ERRORS
FISSION PRODUCTS
GAMMA DETECTION
GAMMA RADIATION
GAS FLOW
HIGH TEMPERATURE
INSTRUMENTS
MEASURED VALUES
NEUTRON FLUX
NUCLEI
OPERATION
PIPES
PLANNING
RADIATION DETECTORS
RADIOACTIVITY
REACTORS
RECORDING SYSTEMS
RESOLUTION
SENSITIVITY
SPECTROSCOPY
STABILITY
THERMAL NEUTRONS
TRANSPORT
USES
VARIATIONS
WEIGHT