Neutron Monitor (Cosmic Ray Observations)
is situated in Irkutsk (Russia)
Po - average barometric pressure
Rc - effective geomagnetic cutoff rigidity
Height - location above sea level
SF - scaling factor
For recording the CR (Cosmic Rays) neutron
component at Irkutsk,
neutron monitor NM-64
is used, which is an installation with 18 two-meter proportional counters
filled with BF3 (boron trifluoride gas) in which
the B10 isotope has been enriched to >90 per cent of the total boron.
The counters surrounded by the moderating material (polyethylene) and
generating material (lead). A total weight of the installation is more than 30
tons. The neutron monitor is located at 475m above sea level.