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Liquid Scintillation. Science and Technology by A. A. Noujaim

By A. A. Noujaim

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Thorngate and W. J. McDowell, J. Inorg. Nucl. Chem. (in press). 31 Measurement by Liquid Scintillator of Labelled Compounds ( H or lkC) Dropped onto Supports Sonia Apelgot and Maurice Duquesne Laboratoire Curie de la Fondation Curie - Institut du Radium 11 rue P. et M. Curie. 75231 Paris Cedex 05 (FRANCE) Abstract Radioactive compounds dropped onto supports are measured correctly, even if not extracted by liquid scintil­ lator. Their dissolution is not required, it suffices simply to have a contact between the ß particles and the liquid scintillator.

24 ALPHA COUNTING AND SPECTROMETRY via pulse-shape discrimination (20). Beta or gamma inter­ actions with the scintillator produce light approximately 10 times more efficiently than do alpha particle interactions. This difference in light-producing efficiency plus the fact that both beta and gamma radiation produce a continuous pulse height distribution from zero to some maximum value* preclude separating this interference on an energy basis. Although alpha and beta-gamma produced pulses are of different pulse-shape (or pulse-time-duration) in some liquid scintillator systems (13, 21), they cannot be separated on a pulse-shape basis using presently available commercial betaliquid-scintillation equipment because the pulses are not processed in the optical or electronic system in such a way as to retain this information.

73 9-050 We utilized an aqueous solution of [ H ] t h y m i d i n e . 050 or 0. 20) onto two s u p p o r t s . The p a p e r utilized h e r e w a s Whatman n° 17. The m e a s u r e m e n t of radioactivity m a d e at t = o c o r r e s p o n d s to that m a d e in thehowr following the i m m e r s i o n of the support in NE 220; the e q u i l i b r i u m c o r r e s p o n d s to t= 7 days for m e a s u r e m e n t s m a r k e d (+); t = 19 days m a r k e d ( · ) and t = 30 days m a r k e d (* ) .

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