The hydrogen concentration for the reference material low-alloy steel was estimated using prompt gamma neutron activation
analysis. The hydrogen concentration had a range of 0.91–1.14 mg/kg as measured by the prompt gamma activation method but
the reference value was about 1.0 mg/kg as measured by the ICP/AES method. The relative error appeared to be 14% and the differences
showed as the background by blank. The standard reference material (NIST SRM) was used for the analytical control.