By A. A. Noujaim
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Extra resources for Liquid Scintillation. Science and Technology
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 (* ) .