Help, how can I make an ionization chamber - Page 1
Forum section: electronics / projects

author: daisizhou
author_rank: Super Contributor
timestamp: February 23, 2023, 10:00:44 am
content: Hello, everyone. I plan to build an ionization chamber. What key points should I pay attention to.The ionization chamber I want to make is 6000-528.I've only seen its pictures.I found the relevant manuals of 6000-528,I don't know whether it can be successfully produced based on these materials alone,If you have made ionization chamber, please help me, thank you

author: jonpaul
author_rank: Super Contributor
timestamp: February 23, 2023, 10:50:58 am
content: many textbooks back to 1930s on theory and practice of ionization chambers and nuclear radiation detectors.What objectif particles, energies?intention for the high voltage power supply, amplifier?1. search for them, get one2. read and learn how to design and construct.3. get matériel, build debug test.bon chancej

author: daisizhou
author_rank: Super Contributor
timestamp: February 23, 2023, 11:13:39 am
content: X ray, The voltage is 200-300vI found these useful clues from the data

author: daisizhou
author_rank: Super Contributor
timestamp: February 23, 2023, 11:52:00 am
content: I disassembled a built-in ion chamber connected to it (small size).The BNC interface at the end of the built-in ion chamber is the interface connecting 6000-528.

author: daisizhou
author_rank: Super Contributor
timestamp: February 24, 2023, 06:54:45 am
content: Who can know? Which material is the black disk made of?

author: TurboTom
author_rank: Super Contributor
timestamp: February 24, 2023, 06:11:54 pm
content: It's most likely some thin FR2 (phenolic paper) sheet, coated with a carbon based high resistance varnish to provide some amount of conductivity. This way, a flash-over will be automatically current limited.An ion chamber will work with air or other gases (propane-butane mixture) at atmospheric pressure. Some designs benefit from a (very) slow gas flow.Other designs may works as well, for example a grill of very thin wires sandwiched between two conductive surfaces. I once considered making something like this from a stack of PCBs, providing some unidimensional spacial resolution and have the charge amplifiers located right on the PCBs. The lack of time kept me from starting the project...

author: jonpaul
author_rank: Super Contributor
timestamp: February 24, 2023, 06:30:29 pm
content: Scientific American magazine 1960s had an article on this see Amateur Scientist column.You can use a tin canj

author: MathWizard
author_rank: Super Contributor
timestamp: February 24, 2023, 10:13:10 pm
content: I have an old Geiger counter, it has a metal can part that looks like your clear plastic chamber. IDK how mine works, there's very little circuitry inside, and I'm pretty sure it's just all DC, so still low voltage. It runs off batteries, the highest rail being only 24V or something. It uses some weird old batteries, so I haven't tried in it many years, and not since I got a good bench PSU to try it.

author: daisizhou
author_rank: Super Contributor
timestamp: February 25, 2023, 12:09:38 am
content: I simply drew a picture,The transparent layer in the middle is acrylic plate,The black layer on the top looks like carbon-based material,It is soft,The center cable of BNC cable and its connection.It looks like an electric fieldI don't know how it works

author: daisizhou
author_rank: Super Contributor
timestamp: February 25, 2023, 12:11:20 am
content: My ion chamber is used to measure X-rays. The voltage is 200-300V ACI don't know how it works, so I disassembled it

author: Stray Electron
author_rank: Super Contributor
timestamp: February 25, 2023, 12:51:08 am
content: Quote from: daisizhou on February 23, 2023, 10:00:44 amI never built one but one of the LARGE sets of encyclopedias from back in the early to mid 1960s had a long article about how to built a Wilson cloud chamber. It set on a block of dry ice to cool it and IIRC had a slight amount of alcohol in it to make the clouds. It used a small amount of radioactive material on the head of a pin. The radioactive material would emit particles that would leave visible tracks in the alcohol vapor cloud. At the time, there was a place that you could write to and they would send you a pin with a tiny amount of radio active material on it. There was no electronics involved in that one. I found the article and spent about two days recopying it by hand with the intention of building one but I never did.

author: daisizhou
author_rank: Super Contributor
timestamp: February 25, 2023, 01:09:05 am
content: I have checked this kind of ion chamber, but the one I disassembled seems to be the principle of electric field. Maybe X is suspected of deflecting in the electric field or other principles, at least I haven't understood

author: JimRemington
author_rank: Regular Contributor
timestamp: February 26, 2023, 10:14:24 pm
content: Instructions for DIY ion chambers here:http://techlib.com/science/ion.htmlhttp://techlib.com/science/ionpage2.htmlThe designs work fine. I've used them as optional projects for advanced students in introductory physics lab courses.

author: TimFox
author_rank: Super Contributor
timestamp: February 26, 2023, 11:02:00 pm
content: An ionization chamber is a two-electrode device filled with air, vented to ambient pressure so as not to stress the thin membrane on one face.A DC voltage (not AC) is applied: with enough voltage, all of the ions created by ionizing photons will be collected.The natural units for such chambers are Roentgens (charge per gas mass), now defined as 1 R = 2.58×10−4C/kg.The original definition was 1 esu/cm3of air at standard pressure and temperature.The esu is an annoying unit of charge: 1 esu = 1 statcoulomb = 3.336x10-10Coulomb.This is a measure of ionization in air, and not the energy deposited in an absorber.Note that at high altitudes, the calibration needs to be corrected due to the lower density of air in the atmosphere; I was surprised once to find that the barometric pressure reported by the Weather Service at a given location is corrected to the average pressure at that altitude, and is not absolutely correct.As a coincidence, 1 R of radiation will deposit about 0.877 rads in dry air or 0.96 rad in soft tissue, and the units are often confused.For any absorbing substance (water and silicon are commonly used), 1 rad = 100 erg/gm = 0.01 J/kg is the measure of actual energy deposited in the absorber.

author: jonpaul
author_rank: Super Contributor
timestamp: February 27, 2023, 02:51:56 am
content: for backround or contamination the currents can be in PA,range we used Victorieen o Raytheon glass electrometer tubes, 1 v filament.Load resistance 100...10,000 g OhmSee Cold War radiation survey meters.j

author: daisizhou
author_rank: Super Contributor
timestamp: February 27, 2023, 04:01:35 am
content: Looking at this picture, I found a transformer, which may be a step-up transformer, so I guess it is AC voltage

author: daisizhou
author_rank: Super Contributor
timestamp: February 27, 2023, 06:42:36 am
content: I just tested the bias voltage of the external ionization chamber, and it is indeed - 305.4V DC voltage