Physics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nimpa.395..195c&link_type=abstract
Nuclear Instruments & Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, v
Physics
3
Radiation Counters, Neutron Counters, Cosmic Rays, Radiation Detectors, Neutron Sources, Monte Carlo Method, Computer Programs, Dosimeters
Scientific paper
A portable BF3 counting system is used to monitor the low intensity cosmic neutrons. The system is calibrated by isotopic neutron sources and normalized to cosmic neutron measurement using a Monte Carlo transport code for the conversion to the dose equivalent rate. The system is field-tested in air, land, and sea around Taiwan where the vertical cut-off of geomagnetic rigidity is the highest in the world. The dose equivalent rates, measured in the middle of current cycle of solar minimum, were 0.54 nSv/h on the ground at sea-level to an in-flight 41.4 nSv/h at 16 000 ft cruising altitude. The rug-proof BF3 counting system is suitable for field measurement of extensive survey and long-term monitoring of the low intensity cosmic neutrons.
Chen Chien-Yi
Chung Chih-Ching
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