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Geiger counter.
- Thread starter Combat Engineer
- Start date
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VICTOREEN CD V-715 Instruction and Maintenance Manual
RADIOLOGICAL SURVEY METER OCD ltem No. CD V-715
www.survivalmonkey.com
This link gives info.
It contains a link on the page to "download a manual".
I did not do this. I'm a bit paranoid about downloading stuff.
I'm not sure how you can calibrate it.
Unless you have access to a "known source".
Unless you have access to a "known source".
Ionization type smoke detectors have trace amounts of radioactive material.
Yes.
And the source decays.
So.. the decay is not "known".
You need a source that states it puts out a certain amount over a certain time.
For example, 1 mrem/min
I didnt mean it as a calibration source. Just something to move the needle a bit in a pinch.
I get it.
But I spent my life calibrating things, including detectors.
Equipment that isn't calibrated, is next to useless.
My point was he probably has a handy object that would at least move the needle a bit. A decent first step until he could find a calibration control.
I'm not sure this one is sensitive enough.
It's a higher range one according to the links I read.
This is true if you want to measure and quantize. If you just want to know if there more than just a little radiation I'd think it would work for that.
Unless it's so off it pegs the meter with safe levels of input, but a smoke detector should be able to verify it even works.
If the meter moves a little, or a lot, that doesn't tell you anything.
Cause calibrations drift normally.
Over time, they drift more and more.
So bad, that you can measure a small source, and it pegs.
Or a large source, that looks okay.
spencer rifle
Grandmaster
Not really a Geiger counter - it's a survey meter for measuring background radiation. A Geiger counter will have a "microphone.", headphone jack and a radiation source on the side for calibration.
Frank_N_Stein
Grandmaster
You could go to a cancer treatment center and ask them to fire up the Gamma Knife. Or buy something that puts off gamma radiation from the dark web.
Many years ago at a test lab worked for 33 years we performed field x-ray using Iridium 192 sources. When some of the rules changed we were able to move our survey meters (geiger counter) calibration from 3 months to 6 months as long as we checked them at certain times.
This was our check source with a small/weak Cesium 137 check source.
When the lab closed this is one of the things I ended up with. The size of the source is in micro curies so it was/is not regulated.
closer pic of the actual source
This meter like your reads in R/HR. If you're in that radiation field for a while you're gonna have some issues
That meter uses an ionization chamber (see below) instead of a Geiger Mueller tube
Below is a true Geiger counter type meter that my Dad had. He was into the Civil Defense big time in the 60's. I remember going with him to a regional meeting where they had to use their meters to find a low energy source.
The GM tube is in the handheld tube. you can see that at a distance it doesn't read much.
Cesium 137 has half life of 30 years so this source still should at least read 1 mr/hr on a sensitive survey meter.
It still pegs out this meter on the One setting. At that setting the meter pegs at 0.5 mr/hr
I would say you're welcome to try it but your meter like the one at the top wouldn't really show anything.
This was our check source with a small/weak Cesium 137 check source.
When the lab closed this is one of the things I ended up with. The size of the source is in micro curies so it was/is not regulated.
closer pic of the actual source
This meter like your reads in R/HR. If you're in that radiation field for a while you're gonna have some issues
That meter uses an ionization chamber (see below) instead of a Geiger Mueller tube
Below is a true Geiger counter type meter that my Dad had. He was into the Civil Defense big time in the 60's. I remember going with him to a regional meeting where they had to use their meters to find a low energy source.
The GM tube is in the handheld tube. you can see that at a distance it doesn't read much.
Cesium 137 has half life of 30 years so this source still should at least read 1 mr/hr on a sensitive survey meter.
It still pegs out this meter on the One setting. At that setting the meter pegs at 0.5 mr/hr
I would say you're welcome to try it but your meter like the one at the top wouldn't really show anything.
