Suppression of β-particle events using a capillary tube in liquid scintillation α spectrometry

► Suppression of β-particle events are demonstrated using a capillary tube as a detection cell. ► Liquid scintillation counting of 241Am and 152Eu was performed with PFA capillary tubes. ► The β spectrum is located at the lower-energy region with decreasing i.d. of the tubes. ► Energy resolution and detection efficiency of α particles were kept high. ► This method would be used as a simple α/β discrimination technique for α spectrometry.