measurement datum
flux
NCRP Glossary (https://ncrponline.org/wp-content/themes/ncrp/PDFs/NCRP-Composite-Glossary.pdf)
The quotient of dN by dt, where dN is the increment of the particle number in the time interval dt. The unit for flux is reciprocal second (s^[-1].)
Jack Miller
The flux of cosmic ray muons per cm2 at the surface of the Earth is approximately 1.0.