Division

Note 2: In 0C004, 'boron equivalent' (BE) is defined as the sum of BE_z for impurities (excluding BE_carbon since carbon is not considered an impurity) including boron, where:

BE_z (ppm) = CF × concentration of element Z in ppm;

where CF is the conversion factor $=\frac{{\sigma }_Z{A}_B}{{\sigma }_B{A}_Z}$

and σ_B and σ_Z are the thermal neutron capture cross sections (in barns) for naturally occurring boron and element Z respectively; and A_B and A_Z are the atomic masses of naturally occurring boron and element Z respectively.