Measurement of ²⁴¹Am/²³⁹Pu Atom Ratio in Filter Sample-Based on Count Ratio in HPGe γ Spectrometer

The ratio of ²³⁹Pu 129.3 keV and ²⁴¹Am 59.5 keV γ peak areas was measured by well-type HPGe γ spectrometer for filter samples and reference solution, respectively. Atom ratios of ²⁴¹Am and ²³⁹Pu in filter samples were calculated according to the count ratios and the atom ratio of ²⁴¹Am and ²³⁹Pu in reference solution. Then filter samples were digested chemically and the contents of ²⁴¹Am and ²³⁹Pu were determined using isotope dilution mass spectrometric (ID-ICP-MS) analysis combined with radiochemical separation. The results with two methods are coincident with each other within the uncertainties.