Measurement of Neutron Fluence Above 0.1 MeV with the Dosimeter ⁹³Nb(n,n')^93mNb

The neutron fluence above 0.1 MeV with the niobium dosimeter was measured and the following problems were explicated:1. The measurement of KX rays emitted from ^93mNb is possible without the chemical separation of ¹⁸²Ta activity and ^93mNb activity.2. The niobium wire, ∼1.6 mg, is dissolved by slowly adding a few drops of HNO₃ and HF mixture, and the preparation of the KX-ray source with small self-absorption is possible.3. The uncertainty of the neutron fluence above 0.1 MeV measured with the dosimeter ⁹³Nb(n,n')^93mNb is smaller than 30%, including the uncertainties of the half-life, the branching ratio, the ⁹³Nb(n,n')^93mNb cross section, and the neutron spectrum.