In this paper an improved method for counting the radioactivity of Na
2
14
CO
3
by liquid scintillation technique is reported. Na
2
14
CO
3
solution was added into toluene/Triton X-100 scintillator which was mixed with CO
2
trapping agent
DL-
α
-phenylethylamine. The radioaetivity of Na
2
14
CO
3
was measured for nine days with no observed radioactivity loss. The radioactivity recovery was about 96—102% and the counting efficiency was about 83%.
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references
W. G. Duncombe and T. J. Rising , Andl. Biochem ., 30 , 275 ( 1969 ).
M. A. Crook and P. Johnson ed. , Liquid scintillation counting , vol.5 . London, Heyden and Son , Philadelphia, Rheine , 1978 , p. 195 .
J. C. Macrae and S. Wilson , Int. J. Appl. Radiat. Isotopes , 29 , 191 ( 1978 ).