From: Development of a portable assembly-type cosmic-ray muon module for measuring the density structure of a column of magma
E μ
R
a
b
(GeV)
(km.w.e)
(MeV g−1 cm2)
10
0.05
2.15
1.91
100
0.41
2.40
3.12
1000
2.42
2.58
4.01
10000
6.30
2.76
4.40