- P-ISSN 1225-0163
- E-ISSN 2288-8985
Optimum counting condition of a low level liquid scintillation counter for radiocarbon dating has been determined to minimize the contribution of tritium activity and get the highest FOM by the variation of scintillation solutions, scintillation solution to benzene ratio, and <TEX>${\beta}$</TEX>-ray spectrum counting ranges. Under the condition, background count rate has been reduced to <TEX>$2.26{\pm}0.03cpm$</TEX>, and the maximum measurable age reached to about 40,000 years. And the practicality of counting system has been verified by the analysis of shell and peat samples.