Analysis of Detector-Source Distance and Detector Bias Voltage for Time Resolution of Plastic Scintillation Detectors

Assist. Prof. Elif Ebru Ermiş

The effects of the source-detector distance, the detector bias voltage variation and collimator usage on the time spectra of 133Ba and 207Bi calibration sources were investigated through a spectrometer which was consisted of a BC400 type general purpose plastic scintillation detector. Constant fraction timing method was used to test these effects on the time resolution values. Optimum source-detector distance and bias voltage values with and without collimator were determined for the optimum time resolution. It was concluded that the source to detector apart, the applied bias voltage to the used detector and the collimator usage were quiet effective parameters in coincidence timing experiments.