Improving the analysis method of the Compton camera system mounted on the unmanned helicopter by correcting scintillator coordinates data at each event timing

Shikaze, Yoshiaki 

The previous method used the data during the stable period for the position and attitude angles of the unmanned helicopter as a countermeasure to improve the measurement data analysis of the Compton camera system mounted on the unmanned helicopter. However, this reduced the number of events used for analysis, allowing statistical accuracy to be improved in future. Therefore, all event data were corrected and used this time. The scintillator coordinates of two layers fixed in the previous analysis were replaced with those corrected for the ever-changing positions and tilts for each event. I reconstructed gamma-ray images using the corrected events to improve their statistical accuracy and spatial resolution. I compared the ground measurement results to evaluate the improvement in the accuracy of the reconstructed images of gamma-ray intensity. As for the effect of the improved statistics, a decrease in the residual sum of squares (RSS) was noted after improvement, indicating the effectiveness of this method through good correlations with the ground-measured values. Moreover, from the RSS value comparison, compared to changing from the previous method to the improved method, expanding the range of averaging the measured values was confirmed to be more effective, showing better correlations with the ground-measured values.