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  • 1 Kyoritsu College of Pharmacy 1-5-30, Shibakoen, Minato-ku 105 Tokyo Japan
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Commercially available D2O and deuterated toluene have been measured with a liquid scintillation spectrometer and were found to contain 2.71–6.15 Bq of tritium in 1 ml of D2O, and 1.10 Bq of tritium in 1 ml of deuterated toluene.