Preparation Of Samples By Extraction Of Particles From Filter Media For Gamma-Ray Spectrometry With High Detection Efficiency

The exposed filter media are usually compressed into disks for gamma-ray spectrometry in atmospheric particulate radionuclide monitoring. A novel sample preparation process for gamma-ray spectrometry by extraction of particles in filter media was proposed in order to raise detection efficiency. A device called a particle extractor was developed to extract the particles through a process of washing, spinning, flocculation and filtration. The process was validated by reference and real filter samples. The results showed that the detection efficiency of the rod sample in the well HPGe detector is 5.3 times that of the traditional sample in the coaxial detector.