the adc and decide when the system will be locked out from a second pulse which may appear while the system is recovering from the previous pulse the energy and time via timer 26 may be recorded into memory not shown this recovery time results in a system u201c dead time u201d a second continuous circuit called a track amp hold circuit shown at 25 traditionally this is implemented as a diode and a rectifier which serve to grab and hold the maximum signal which occurs in the time window around the trigger alternately a timed sample and hold circuit could serve this function though not shown in fig1 it is appreciated that the system 10 also includes the supporting circuitry to enable operation such as for example the pulse pileup detector which looks for multiple pulses in a given time window timers to estimate the count rate or dead time a timer which time stamps the pulse for list mode application a histogramming circuit which bins the energy to form a spectrum a gain control feedback system which locks onto a peak in the spectrum and dynamically adjusts the gain of the shaper to compensate for system drift etc these function are would all be considered an enhancements of the basic operation of an mca note that this filter may help with not only microphonics by potentially parallel noise in the detector thus we will need to introduce both concepts in the background information this primarily benefits a hpge system but we should not include any description of the detector in the claims we cannot anticipate what further detector developments will bring and thus should not restrict.