military geiger counter

Military Geiger Counter - Beta gamma radiometer, transistor, 62,

Compared to my IT-65 or DP-5B, this meter is the oldest and simplest in terms of construction and electrical engineering, so it's the same. Basically, it is an extended version of the IBG-58-T, with a different probe and circuit. Otherwise, the circuit and electronic components are very similar to the "predecessor": even

Military Geiger Counter

But as you may have noticed, there is actually something different: a meter is measured in beta decay time, and not in milliröntgens: in fact, it measures many times the beta density per 1 centimeter square per minute.

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Because the lower ratio means "2, 5k rozp./min⋅cm² = 1 mr/hod", one miliröntgen per hour is equivalent to 2500 damage per minute per square centimeter, unless the probe filter to the gamma position. Personally, I think this should be the correct method, because the röntgen is part of gamma rays, not beta decay.

Logarithmic scale has 3 measurement parameters: level 1 with "beta 2" level 1: 0 - 250 000 decaying at "beta 1" position (or 0 - 100 mR/h instead of "gamma") level 1 continued d : 0 - 2 500 000 decay in class "beta 2" 2: 0 - 25 000 decay instead of "beta 1" (0 - 10 mR/h for "gamma") class 3: 0 - 2500 decay instead of "beta 1" (0 - 1 mR/h for "gamma")

The operation is very simple: after opening the part, the switch (flight) of the Geiger radiometric tube, must be changed to "KN", or Kontrola vespa ("Control Voltage"), like DP-5B. If this cannot be done, the battery (two 1.5V “D” fatty cells) must be replaced.

At this point, the device records the background radiation as the phone sometimes does. For the meter to record radiation correctly, one of the 3 levels must be adjusted.

Rbgt 62 Geiger Counter (radiac)

Unlike the IT-65 and DP-5B, the probe shield has three different positions instead of two: one marked "beta 1", which allows easy access to beta radiation; "Beta 2" filters out the lightest and most powerful beta rays to detect the beta rays, and "gamma" filters out in general.

So, a good check for contaminated radiation would be as follows: probe at the "beta 1" position, very low level - area "I", read the value at a meter - if it's too low, go down to 2 meters until get it right. read With this method, both beta and gamma radiation readings are visible. To obtain the most detailed information, the probe shield should be set to the "gamma" position with the same factor as the measured distance. If this value is zero or negative, the element is a beta-positive element (say strontium-90), or beta-contaminated - the test is over. On the other hand, if the value is comparable, or slightly less, it is a gamma emission - or if gamma contamination is present - because the material that converts the milliröntgens is now used and the measurement is made.

If, however, the "between" value is the same as the first reading at the "beta 1" position, this is the gamma-ray activity of the burning object. And to get a single beta reading, subtract the measured value from the previous reading. Now you have two different readings, one for beta, one for gamma rays and you know that the object is contaminated with both types of particles.

There is still one problem left: say the object is a beta emitter (without reading you have gamma shielding), but the meter will measure at the high "I" level. At this "I" level, the probe can be set to the "beta 2" position to obtain readings on the yellow scale above the meter (up to 2,500,000 beta decays).

Original U.s. Cold War Civil Defense Cd V 777 1 Shelter Radiation Kit And Lionel Cdv 700 Geiger Counter Model 6b Radiation Detector

Yes, the measurement is complete. Compared to a digital meter, it is not easy since you have to change the lines accordingly, but the principle of using the probe probe, depending on the contamination, is the same.

The analog input in this meter has a longer rise and fall time, if compared to today's digital Geiger. That means getting a reading is a matter of a second or two... plus the time it takes to subtract the value by 2500 if you're measuring gamma rays. 😉

This also creates the problem that the measuring needle feels strange due to other unnecessary movements of the meter. The DP-5B had a very slow cycle, taking ten seconds to get a high reading. Then again, you could wiggle like a maniac and the needle would stay still, and it would need to be reset with a button to get it to drop quickly. Here, it is not.

I seem to be missing the user manual (which was also a protocol for this type of meter) and the strontium-90 control for this particular meter. However, I was able to find the exact date when this meter was built, or put into military use, using the stamp I found in this case, which says November 1962.

Portable 1950s Cold War Era Geiger Counter / Radiation Detector

The only thing I know about its last calibration, is that white label that says the calibration date was April 2004. Pretty spooky huh?

Compared to my IT-65 and DP-5B, it still reads acceptable values: 17 000 beta decay (6.8 mR/h) for pitchblende particles, where the IT-65 shows 5 mR/h and the DP-5B 7 mR /h.

Like the Sr-90 control derived from the IT-65: this meter shows exactly 50 000 beta decay (or 20 mR/h), while the IT-65 shows 17 mR/h and the DP-5B something more more than 28 mR/ h.

It is a beta emitter, so only the "milirengen" results of the other two meters are shown (and are only valid for gamma transmitters).

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And that's it, folks. Although it has three lines, it is a very small meter, compared to the chamber ionizer IT-65 and the second Geiger DP-5B, but you would be injured or killed anyway if you found yourself in the environment ​​​​​​this meter would be completely gone. .

On the technical side, I like the split probe and meter construction. It's handy and especially when used with a plastic D to AA cell adapter... But it doesn't have a light output rating and as you can see above, they sure saved money on fluorescent lacquer painting!

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