High-resolution alpha spectrometry at ambient air pressure—Towards new applications

An approach for alpha spectrometry is introduced that allows measuring alpha spectra at ambient air pressure with energy resolution comparable to measurements in vacuum. The developed prototype equipment uses a semiconductor alpha detector and a honeycomb collimator. Contamination of 1Bq/cm2 at any smooth and flat surface can be detected in approximately 10s data acquisition time, but longer time is needed for radionuclide identification. A hand-held instrument for in-situ measurements can be manufactured opening a wide range of novel applications in alpha spectrometry. ► We present a novel approach to measure alpha spectra at ambient air pressure. ► Energy resolution is comparable to measurements performed in vacuum. ► Radionuclide identification can be performed from smooth and flat surfaces. ► New instruments and applications for in-situ alpha spectrometry are possible.