SIGNAL PROCESSOR PREAMPLIFIER for SPECTROSCOPY MCA GAMMA RAY SCINTILLATION, US $95.00 – Picture 0

SIGNAL PROCESSOR PREAMPLIFIER for SPECTROSCOPY MCA GAMMA RAY SCINTILLATION, US $95.00 – Picture 1

SIGNAL PROCESSOR PREAMPLIFIER for SPECTROSCOPY MCA GAMMA RAY SCINTILLATION, US $95.00 – Picture 2

SIGNAL PROCESSOR PREAMPLIFIER for SPECTROSCOPY MCA GAMMA RAY SCINTILLATION, US $95.00 – Picture 3

SIGNAL PROCESSOR PREAMPLIFIER for SPECTROSCOPY MCA GAMMA RAY SCINTILLATION, US $95.00 – Picture 4

SIGNAL PROCESSOR PREAMPLIFIER for SPECTROSCOPY MCA GAMMA RAY SCINTILLATION, US $95.00 – Picture 5

SIGNAL PROCESSOR PREAMPLIFIER for SPECTROSCOPY MCA GAMMA RAY SCINTILLATION, US $95.00 – Picture 6

SIGNAL PROCESSOR PREAMPLIFIER for SPECTROSCOPY MCA GAMMA RAY SCINTILLATION, US $95.00 – Picture 7

Signal Processor Preamplifier For Spectroscopy Mca Gamma Ray Scintillation

US $95.00

Tucson, Arizona, United States
Jan 30th

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Signal processing preamplifier for spectroscopy decreases FWHM an average of 5% no matter what scintillator or isotope. This concept is not new it is a semi copy of the front end signal processing that has been used in older ultra high dollar multi channel analyzers in the past. ( those big heavy instruments with cathode ray tube displays ) Now adapted for use with modern computer based systems. #1 First stage input is a high pass filter and pole 0 ( zero ) cancellation network. ( pole 0 cancellation is the rejection of the signal going negative when the desired signal should be totally positive with no over shoot into the negative pulse formation ) The high pass filter rejects unwanted interference form signals that may be picked up with the wires connecting the week signal from the photomultiplier and tube itself such as 60 hZ lines or other radio frequency radiation from external sources. #2 Second stage of processing is the pulse shaper circuit that broadens the pulse to over 100 uS (micro seconds) increasing the resolution and slowing the rising edge of the positive pulse in order for the computer to analyze the pulse at way more points in order to present higher resolution spike resulting in way lower FWHM percentage. ( The lower the percentage the higher the resolution ) #3 Third stage is a preamplifier which amplifies the previously filtered and shaped pulse making up for the loss in amplitude with a second stage of amplification to increase the pulse to approximately 10 Db. over the normal input level allowing you to reduce the volume level settings needed to drive the MCA software eliminating some of the inherent noise associated with higher gain settings. #4 Fourth and output stage lowers the impedance to 1,000 omega and reduces the chances induced coaxial cable ringing from the output to the microphone input of the computer. I have chosen to power this device with the cleanest power source available an internal battery how ever it could be powered from a computers USB port but that opens the door for more exposed wiring and possible unwanted interference. The power source is a single CR 123A 3 volt lithium battery with an on/off switch that disconnects the battery and shunts the microphone input with a 1,000 omega load muting the input when off. This device should be located as close to the scintillator as possible the input cable is 16" long and it can be stuck on the scintillator or collimator chamber with double sided sticky tape so the front cover can be used to access the battery. The current drain is 1-1/4 to 1-1/2 mA so the battery will last a long time. The cable to the computers microphone input is 36" both are RG/174U mil. spec. coax, all parts have been chosen for their properties which reflect the particular circuits involved to assure the maximum stability all are 5% tolerance or better with some being hand picked or matched. ( The quality goes in before the product goes out. ) All parts are new including the housing. I have included some photos of my home lab MCA setup. ( ONLY THE SIGNAL PROCESSER AMPLIFIER DEVICE IS INCLUDED ALONG WITH A CR 123A BATTERY) Photo 1 shows 2.1% FWHM for the high energy peak the average is 2.5% will display 2.5% for a long time but may occasional drop to 1.8% and sometimes 2.8% with a 1uCi Cs 137 source and a 1.5X1.5" inline NaI(TI) scintillator probe. Photo 2 shows the pulse shape ( notice how clean and sharp it is and how little % error factor is showing.) Photos 3&4 show my collimator chamber containing about 45 Lbs. of lead. Photo 5 shows my scintillator probe with its foam insert jacket used to keep it centered in the larger diameter collimator and stabilizes the temperature. ( Even with no shielding or chamber the end result is still an average 2.5% FWHM just a lot more noise on the floor ) I have applied this device on other scintillation crystals like Csi(TI), BGO, STILBENE, and LABR3(Ce) no matter which is used the average resolution improvement is 4-5% lower FWHM. This device is available with a choice of input connectors #1 BNC, #2 1/8" 3.5mm audio connector. ( The connection that you want for the scintillator you want to use ) The 1/8" 3.5mm is for connection to one of my SIGNAL TAPS for single connector scintillators. ( The BNC connector will be supplied by default if you don't specify ) The 1/8" 3.5mm connector on the output is the same either way it plugs into your computers microphone jack. The M.C.A. program is free open source software and is available for download here http://www.theremino.com/en/downloads/radioactivity/ as well as a lot of great helpful information. Typical resolution for various scintillators without processor FWHM NaI(TI) 7%, CsI(TI) 8%, BGO 11%, and LABR3(Ce) 5%. When used with a bench or portable counter with variable voltage adjustment you can still have count display on the instrument as well as spectrum display on your computer at the same time just turn off the processor and continue to monitor background radiation on the counter or alarming rate meter with no cable changes the signal and supply just pass through the processor to the scintillator probe. ( INCLUDES PROCESSOR and NEW CR-123A 3 volt lithium battery ONLY.)

Condition:	New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. ...	Type	preamplifier signal processer
Country/Region of Manufacture	United States