4:00 PM - 4:15 PM
[1M10] Investigation on distribution of radioactive substances in Fukushima
(4)Improvement of analysis method of the GAGG scintillator gamma camera mounted on the unmanned helicopter
Keywords:gamma camera, Compton camera, GAGG scintillator, unmanned helicopter, hot spot, Fukushima Daiichi Nuclear Power Station Accident
As a measure to improve the measurement data analysis of the gamma camera mounted on an unmanned helicopter, we selectively used the 137Cs 662keV gamma-ray events during the time when the position and attitude angles of the unmanned helicopter were stable. However, this eventually reduced the number of events available for analysis to a fraction, leaving room for improvement in statistical accuracy. Therefore, the events that were not used in the previous analysis were corrected and used this time. The coordinates of the two-layer scintillator pixels, which were previously fixed based on the average value of GPS and attitude angle data, are replaced with the coordinates of the scintillator pixels with the ever-changing position and tilt corrected for each event, and the corrected event. Gamma-ray image reconstruction was performed using all of the corrected events above, and efforts were made to improve its statistical accuracy. In this presentation, we will report on the correction method and results.