Spectech. ST400 Scintillation Processor. Operating Manual

Transcription

1 Spectech ST00 Scintillation Processor perating Manual pril 00

2 Introduction The ST00 Scintillation Processor provides a convenient interface between a scintillation detector or photomultiplier and a multichannel or single channel analyzer. The instrument contains a high voltage supply to power the PMT, a charge sensitive preamplifier and bipolar shaping amplifier to process the signal prior to analysis. The unit is designed to operate with either anode signals directly from the detector or positive output signals from an external scintillation preamplifier. For user convenience, both MHV and SHV connectors are provided on the high voltage output for connection to most commonly available detector tube bases and preamplifiers. nly scintillation detectors and photomultipliers utilizing a positive high voltage supply are compatible with the ST00. Specifications Preamp In mp In mp ut High Voltage Power Input harge sensitive preamplifier for connection to the anode output of the detector. This input is used for detectors with a simple voltage divider type tube base producing negative anode output signals. Direct input to the shaping amplifier. Used for connecting to detectors with an external preamplifier producing positive signals. Positive leading bipolar output from the shaping amplifier for connecting to a multichannel or single channel analyzer. 0-0 volt range set by coarse and fine gain controls, x-x, µsec. peaking time volt positive supply with m. maximum current capability. Fully regulated and controlled by 0-turn direct reading potentiometer. MHV and SHV connectors. volt from power module supplied. ontrols and Indicators Power High Voltage Push button turns on power to unit and lights indicator. Push button turns on high voltage and lights indicator. HV djust Direct reading 0-turn potentiometer sets high voltage output level, volts. oarse ain position rotary switch sets sets amplifier gain from x to x. Fine ain ctivity 0-turn direct reading potentiometer sets fine gain from x0. to x.. Indicates when pulses are being received and processed by the ST00.

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4 peration Detectors with voltage divider base. onnect the anode (signal) output from the detector to the Preamp In connector. onnect the High Voltage output to the detector high voltage connection using the appropriate cable. onnect the mp ut to the multichannel analyzer D (direct) input. Turn on the power to the ST00, set the high voltage to the specified value for the detector and turn on the voltage. Place a radioactive source on the detector (s-) and increase the coarse gain until the ctivity light begins flashing indicating events are being processed. Start the multichannel analyzer in pulse height analysis mode and continue to adjust the coarse and fine gain until the desired calibration (energy range) is obtained. If the operation voltage for the detector is not know, set the coarse gain to x, fine gain to.0. turn on the high voltage and with the multichannel analyzer running, continue to increase its value until the correct calibration is obtained. Fine adjustments may now be made using the Fine ain control. Using an external preamplifier Some detector tube bases such as the Tennelec model T, incorporate a built-in preamplifier which takes its power from the high voltage supply. In this instance, the output signal from the preamplifier must be connected to the mp In connector on the ST00. ther types of tube bases such as the RT model offer both anode and preamplifier outputs. hen using this configuration, we recommend using the anode signal connected to the Preamp In on the ST00. If an external preamplifier must be used, most likely it will require low voltage D power which is not supplied from the ST00. If this power is made available, then the positive preamplifier output signal may be connected to the mp In on the ST00 Spectrum Techniques 0 Union Valley Road ak Ridge, TN 0 US Tel: () - Fax: () -0 -mail: spectech@esper.com

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