Geiger Counter Test Card

I bought this to test my Geiger counter. It worked great - it showed about 2,000 counts in the center and approximately 12 millisieverts.It's a completely safe product - the radiation drops to background levels at just 10-15 cm from the source right above the surface and even faster at the edges.

Between the two samples from the Geiger Counter Radiation Test Card and The Uranium Ore my handheld Muller Tube GQ GMC-800 geiger counter averages were: CPM=3,093 - μSv/h=20.11 - mR/h=2.01 - CPS=65The readouts would be even higher if I took the samples out of the plastic but I actually sealed them with an extra 4 mil airtight Plymor bag before testing.I'm impressed by these samples. Great way to check your background radiation gear and examine radioactive minerals and anything else you want to test.The alpha radiation is rated at CPM 19,000 if you are using an alpha capable probe for the readout of the Uranium Ore.Happily nuclear,Starry

Showed 400CPM on a Pudibel NR-750 radiation monitor. Background was 10 CPM +/-5I left the radiation test card in the outer plastic jacket with the paper spec sheet inside on one side of the source card. So that is two protective plastic jackets. With the least amount of obstructions it measured 400CPM. the other side was around 290 to 300. The meter was placed on the source about the centerRadiation drops off at about a foot above the center.For storage, I put it in a plastic tackle box in the middle using the two storage shelves to hold it in the center. The meter measured 10CPM directly over the card so I think this is a safe storage method. I wrote Radiation Test Source on the box top and side.

I got a reading of 1.17 uSv/hr with my Radex 1503+ device which seems to match the pics of other reviewers who have the red dot card. Those who got the yellow ones look like they read much higher. Don't expect too much, it's not for calibrations, just to test functionality.

So the key to this test card is that to get it to register properly, you have to have it *as close as possible* to the detector tube (and the openings that allow entry of the particles into the meter). If you simply set the meter on top of it (GQ 300 or 500+) you'll only get a fraction of what you ought to. You need to hold the blob on the card right up to the openings at the bottom of the meter to get the proper reading. The difference between simply setting the meter on the card (for me) and the RIGHT position was 50 CPM (not much above background) vs >800 CPM. Even two or three inches away from the card will drop you down below 100 CPM. Worth remembering.

I don't know about the accuracy of my Geiger counter, I'm just happy to see that it somewhat works. I got a reading of 5 micro-Sv/hr just throwing my device on top of the test card without much thought to optimum placement. I'm going to play around with it a bit more to see what I can get. So far, I'm happy.

Im glad something on Amazon isn't a scam and I managed to find the one product on aliexpress that also wasn't. Product works well and is effective. I put it in my tool box and my meter gets nothing from it outside

worked as expected.