Principle and application of sub-threshold correcting for sensitivity calibration by single particle

The technique of calibration by single particle is very important for the current detector on the energy response research. Based on the analysis of the energy response characteristic and pulsed signal producing process, a method was proposed for the sub-threshold correcting, which extended the calibrating technique to much lower energy range. According to the correcting technique, the measured sensitivities to ⁶⁰Co by single particle calibration and traditional current calibration match each other within 1.1% difference. The sensitivity ratio of ⁶⁰Co to ¹³⁷Cs matches the theoretical value within 7.0% difference.