Uniformity of response of Uranium fission chambers used as neutron beam monitors. (1st January 2022)

• Record Type: Journal Article
• Authors: Lafont, F.; Guerard, B.; Hall-Wilton, R.; Kanaki, K.
• Is Part Of: Journal of instrumentation. Volume 17:Number 1(2022)
• Publication Date: 2022-01-01
• Subjects: Beam-line instrumentation (beam position and profile monitors, beam-intensity monitors, bunch length monitors) -- Neutron detectors (cold, thermal, fast neutrons) -- Gaseous detectors; Scientific apparatus and instruments -- Periodicals; 502.84
• DOI: 10.1088/1748-0221/17/01/P01032
• Languages: English
• ISSNs: 1748-0221

Abstract

Abstract: Uranium fission chambers are commonly used for neutron beam monitoring in neutron research facilities. The challenges brought with the renewing or commissioning of new neutron facilities encourage to minimize the interaction between the monitor and the neutron beam. In order to characterize both their detection efficiency and transmission factor, several fission chambers, have been scanned on the CT1 monochromatic beam line of the ILL. Results show that the monitor transparency, measured at the center of the monitor, varies from 90% to 96%, and that the detection efficiency varies by as much as 50% over the active area.