Abstract：An low-background α and/or β measuring instrument was developed which can measure the gross α and/or β activity of environmental levels.A plastic scintillator was choosed as sensor and anti-coincidence technique was used to lower the background.Because of being equipped with six separate low-background α,β main detector,the instrument is to measure six samples simultaneously and give the gross β and/or α activity.The experiment results indicate that90Sr-90Y β 2π counting efficiency ratio is 50% with a background of 0.9cm/min1,239Pu α 2π counting efficiency ratio is 80% with a background of 0.008 cm/min.
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2011, Vol. 32 
