Identification of low level characteristic radionuclides and elimination of the interfering factors

Objective: For providing the reliable evidences in monitoring a radionuclide released events, the techniques of identifying the characteristic radionuclides and its elimination of the interfering factors be promoted in a low level particulate air samples. Methods: the methods for identifying characteristic radionuclides be introduced when the γ-ray spectrum is being analyzed, other interfering factors and their elimination methods be discussed, the calculation methods of minimum detectable activity and/or the sensitive threshold be listed. Results: All of the radionuclides contained in two intercomparison samples had be identified, and our measurement results are closed to the reference values announced by IAEA. Conclusion: As a results of tests in two intercomparison on radionuclides measurements organized by IAEA in 2002, it have proved that the methods introduced in the paper is creditable and reliable