Hokkaido University

Ryo Ogawara

Masayori Ishikawa

The present invention identifies &#x3b1; decay and other events included in the emission of an LaBrscintillator and only collects &#x3b3; ray events. An LaBrscintillation detector is provided with an LaBr3 scintillator, a photomultiplier tube, an oscilloscope, and a computer. The computerdetects a peak value Vp and a total charge amount Qof a voltage waveform signal and calculates an error propagation expression function for a ratio of the peak value Vp to the total charge amount Q. This error propagation expression function is used as a threshold function for identifying and removing &#x3b1; decay events. The &#x3b1; decay events are identified from the peak value Vp and total charge amount Q, which are measurement values that can be measured in real time.

LABR3 scintillation detector and specific event removal method

A scintillation light detecting device distinguishes between signals from scintillator elements. The device includes a scintillator array. In the scintillator array, the scintillator elements have mutually different decay time constants for emitted light generated as a result of an incident radiation event. A photomultiplier tube that receives light output from the scintillator elements and converts the light into an electrical signal. In relation to the event, an arithmetic processing device detects a peak value and an integrated charge quantity in a voltage waveform of the electrical signal from the photomultiplier tube, and identifies the scintillator element in the scintillator array to which the electrical signal, resulting from the incidence of radiation onto the scintillator element, is attributable, in accordance with a ratio between the detected peak value and integrated electric charge quantity.

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Sapporo, Japan

Ryo Ogawara