1:45 PM - 3:15 PM
[O08-P49] Development of radiation detectors using split scintillators
Keywords:Cosmic rays, split scintillators
Various types of radiation exist, each with different arrival frequencies and energy levels. Currently, detectors capable of identifying the type of radiation that has been delivered are expensive and difficult to handle because of their complex structures. Our goal is to develop a detector that is inexpensive, easy to build, and has a structure that can identify radiation species.
Radiation detectors usually consist of a material called a "scintillator" that emits fluorescence when it interacts with charged particles such as radiation, and a semiconducting element called a "SiPM" that converts light from the scintillator into an electrical signal. When multiple scintillators are stacked on top of each other, radiation that passes close to the SiPM is detected as a strong light with low attenuation, while radiation that passes far from the SiPM is detected as a weak light with high attenuation. Using this feature, we created a "split scintillator detector" in which multiple plastic scintillators are stacked on top of each other through an air layer, and SiPMs are attached to both ends of the scintillators. Data analysis was performed using two-dimensional histograms correlating the electrical signals acquired from the SiPMs at both ends.
In Experiment, environmental radiation was measured at different detector angles.
Cosmic rays are the only type of radiation known to have an arrival frequency that does not vary with zenith angle. Therefore, detectors were placed at zenith angles of 0° and 90° for detection, and the obtained histograms were compared. The analysis showed that the number of detections varied in certain regions of the histogram, which was determined to correspond to cosmic rays based on references.
Also, the position sensitivity of the split scintillator detector was examined. We used the PF-AR test beamline at the High Energy Accelerator Research Organization(KEK). By irradiating a beam generated by an accelerator at a targeted position of the detector and examining the change in the two-dimensional histogram, we thought we could get a closer look at the position sensitivity of the segmented scintillator detector. The presentation will discuss the results of the analysis in light of the results.
As a future prospect, we aim to identify radiation areas other than cosmic rays. We believe that this goal can be achieved through further study, such as covering the detector with radiation shielding.
Radiation detectors usually consist of a material called a "scintillator" that emits fluorescence when it interacts with charged particles such as radiation, and a semiconducting element called a "SiPM" that converts light from the scintillator into an electrical signal. When multiple scintillators are stacked on top of each other, radiation that passes close to the SiPM is detected as a strong light with low attenuation, while radiation that passes far from the SiPM is detected as a weak light with high attenuation. Using this feature, we created a "split scintillator detector" in which multiple plastic scintillators are stacked on top of each other through an air layer, and SiPMs are attached to both ends of the scintillators. Data analysis was performed using two-dimensional histograms correlating the electrical signals acquired from the SiPMs at both ends.
In Experiment, environmental radiation was measured at different detector angles.
Cosmic rays are the only type of radiation known to have an arrival frequency that does not vary with zenith angle. Therefore, detectors were placed at zenith angles of 0° and 90° for detection, and the obtained histograms were compared. The analysis showed that the number of detections varied in certain regions of the histogram, which was determined to correspond to cosmic rays based on references.
Also, the position sensitivity of the split scintillator detector was examined. We used the PF-AR test beamline at the High Energy Accelerator Research Organization(KEK). By irradiating a beam generated by an accelerator at a targeted position of the detector and examining the change in the two-dimensional histogram, we thought we could get a closer look at the position sensitivity of the segmented scintillator detector. The presentation will discuss the results of the analysis in light of the results.
As a future prospect, we aim to identify radiation areas other than cosmic rays. We believe that this goal can be achieved through further study, such as covering the detector with radiation shielding.