To establish a quenching correction method for 3H and 14C in aqueous samples with commercial liquid scintillation cocktails,unquenched reference sources and quenched series reference sources of 3H and 14C were prepared with DIN(Diisopropylnaphthalene)scintillation cocktails.The stability of the reference sources was investigated in dark condition at room temperature.The change of the correction efficiency of the quenched series of reference sources was less than 0.5％after 16 months.The slopes of activity and tSIE of the unquenching reference sources of 3H and 14C were lower than the critical value during 30 months,which meant that these reference sources were stable.The quenching correction accuracy of toluene and DIN quenched series reference sources was compared by correcting 3H and 14C samples consisted of different commercial liquid scintillation cocktails.As a result,the correction curve of DIN reference sources was more suitable for commercial liquid scintillation cocktails such as Ultima GoldTM AB,Ultima GoldTM LLT and Optiphase HiSafe 3.
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