Experimental Modern and Quantum Physics for Do-It-Yourself Science Enthusiasts 

Facebook Flickr LinkedIn YouTube RSS
magnify
Home Book Chapters Chapter 3 - Atoms and Radioactvity Simple d.i.y. Bias-T for Scintillation Probes with Single Connector
formats

Simple d.i.y. Bias-T for Scintillation Probes with Single Connector

diy Signal/High-Voltage Splitter for Scintillation Probe with Single Connector David Prutchi www.diyphysics.comMany surplus scintillation probes have a single connector through which the PMT is fed with high voltage and the anode signal is output.  However, this may require an external “Bias-T” (a high voltage / signal splitter) to connect the probe to a high-voltage power supply that is separate from the PMT amplifier/processor.

diy Signal/High-Voltage Splitter for Scintillation Probe with Single Connector David Prutchi www.diyphysics.com

I recently built a Bias-T for my tiny Scionix scintillation probe.  The probe contains a Hamamatsu R1635P 10 mm-diameter photomultiplier tube coupled to a small NaI(Tl) scintillation crystal.  The probe also contains the dynode voltage-divider string, and connections are made through a tiny high-voltage locking coaxial connector.

diy Signal/High-Voltage Splitter for Scintillation Probe with Single Connector David Prutchi www.diyphysics.com

I built the Bias-T inside a Pomona model 2392 aluminum enclosure with three BNC connectors.   Inside the box, a 1 MOhm resistor is used to bias the PMT from the high-voltage input connector (this value is appropriate for my application, but you may require a different value, typically within the 100 kOhm to 10 MOhm range).  The PMT’s anode signal is coupled to the signal-output BNC connector through a 0.001 uF @ 3 kV capacitor.   The aluminum enclosure provides appropriate shielding against noise, protects the user from high voltage, and makes it easy to connect instrumentation by inserting it in-line with the scintillation processor’s input.

diy Signal/High-Voltage Splitter for Scintillation Probe with Single Connector David Prutchi www.diyphysics.com

 

 

 

Please visit www.diyPhysics.com and www.prutchi.com for other cutting-edge d.i.y. projects, and remember to check out our new d.i.y. Quantum Physics book:

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
No Comments  comments 
Add Comment Register



Leave a Reply

Your email address will not be published. Required fields are marked *


*

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>