LND 50316 proportional detector

[Ara]

Hello everyone

I recently bought a proportional detector LND 50316. It has two connectors for H.V. and Signal. Please help me connect this detector correctly. Are additional resistors and capacitors needed? What is the polarity of high voltage? When connected directly to a positive voltage of +500 +2000V without resistors and capacitors, it does not work and does not produce pulses.

[Sesselmann]

Ara,

This looks like a high pressure ion chamber...

https://www.lndinc.com/products/ionizat ... ers/50316/

Steven

[Ara]

Hello Steven

Yes, I know this information. This file does not answer my questions. There is no polarity indicated and there is no connection diagram.

[Svilen]

Hi Ara, please add your real name and location according to the forum rules. I'm not an expert in electronics, but I guess it is a positive HV and you don't need "additional resistors and capacitors", but maybe a charge sensitive preamplifier? How did you try to read the output?

[Sesselmann]

Ara,

As Svilen said, please give yourself an introduction and add a real name to your signature.

Ion chambers typically don't output a pulse, they measure tiny differences in potential due to a continuous flow of electrons caused by the bias.

http://techlib.com/science/ion.html

Steven

[Ara]

I ordered high voltage capacitors. I'm not sure that it will work without external elements.
I answered all the questions during registration. This is my real name, just a short name.

[Rob Tayloe]

The detector is an ion chamber and will yield a current in response to gamma radiation. I obtained a few of these for use in experiments with the Ohio State University nuclear reactor when I taught lab classes there. We typically used several neutron sensitive (BF3 filled) ion chambers for experiments (control rod calibration, measurement of delayed neutron parameters, etc.), but I thought that some insight could be gained with complementary gamma measurements. A fission event yields gammas as well as neutrons.

The signal strength, according to the specs, is around 6.5 E-10 amps per R/hr. We would take the current signal and pass it into an electrometer, which would convert the current to a voltage (with auto scaling features). The voltage output was connected to a strip chart recorder when I was a student. In more recent times (i.e., this century!) an ADC was used so that digital data was saved to a computer.

Unless one is measuring quite high radiation levels such a detector might not be useful to a hobbiest. A surprisingly sensitive ion chamber can be inexpensively constructed using instructions found in the link below -
http://techlib.com/science/ionpage2.html

I have built these "tin can" ion chambers and used them for class room demonstrations (e.g., radon decay from a thorium laden lantern mantle).

If one wishes to get "pulses" from gamma signals (not spectroscopy, but GM detectors), there are inexpensive kits that one can purchase to assemble (or get pre-assembled). Links are given for some examples that I have built and students have successfully built. One may need to separately obtain a suitable GM detector if such is not included in the kit. -
https://www.adafruit.com/product/483
https://www.rhelectronics.store/radiati ... nd-edition
https://www.aliexpress.us/item/32568038 ... ry_from%3A