The development of an alpha/beta separation liquid scintillation cocktail for aqueous samples |
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| Authors: | J M Pates G T Cook A B Mackenzie J Thomson |
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| Institution: | (1) Scottish Universities Research and Reactor Centre, East Kilbride, G75 0QU Glasgow, Scotland;(2) Packard Instrument Company, B.V., Ulgersmaweg 47, 9731 BK Groningen, The Netherlands |
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| Abstract: | Scintillation cocktail components were studied with regard to their impact on pulse decay discimination (PDD) and hence the separation of alpha from beta activity, using a Packard 2250 CA  / . Di-isopropyl naphthalene (DIN) was found to be the most suitable solvent, both from safety considerations and also the fact that it acts in a very similar manner to naphthalene in stretching the pulses produced at the photomultiplier tube anode and hence enhancing the separation. Increasing the surfactant concentration and the use of dimethylanthracene (DMA) as secondary fluor degraded the cocktail's performance. PMT anode pulse shapes were found to be a useful indicator of PDD efficiency but could not give a quantitative guide. |
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