title: Rapid alpha spectrometry from liquids doped with ²⁰⁹Po and ²⁴¹Am using simplified sample processing.
abstract: Rapid detection of alpha-particle emitting radionuclides from liquids doped with (209)Po and (241)Am was investigated. These nuclides may mimic or be among those that could be used as threat agents in malevolent actions such as deliberate poisoning of refreshments. The liquids investigated here by using a semiconductor alpha detector in vacuum were coffee, beer and apple juice. Methods for the sample processing were rapid evaporation of the liquids and filtration. Both methods produced samples, which gave alpha spectra that could be readily analyzed by an unfolding program. The doped radionuclides were easily identified from the spectra, but the samples were too thick for reliable activity determination. Determination of the activity ratios is possible if the peak shapes are equal. However, radionuclides may behave differently during the sample preparation, which must be accounted for in the activity ratio determination.
authors.affiliation: STUK - Radiation and Nuclear Safety Authority, P.O. Box 14, FI-00881 Helsinki, Finland. Electronic address: roy.pollanen@stuk.fi.
authors.forename: R
authors.initials: R
authors.lastname: Pöllänen
authors.affiliation: STUK - Radiation and Nuclear Safety Authority, P.O. Box 14, FI-00881 Helsinki, Finland.
authors.forename: R
authors.initials: R
authors.lastname: Simola
authors.affiliation: STUK - Radiation and Nuclear Safety Authority, P.O. Box 14, FI-00881 Helsinki, Finland.
authors.forename: P
authors.initials: P
authors.lastname: Vesterbacka
keywords: Alpha spectrometry; Liquid sample; Sample processing