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This thing can never be "accurate". Proper instantaneous measurements for radiation require more than a good detector. The operator is part of the equation.

Say you have two pieces of fish in front of you. Answering the question "which one is more radioactive" requires more than holding a device over each for a couple minutes. You have to think of the flux, the surface area of the fish visible to the detector, the orientation of the detector, any background sources, the mass of each piece and most importantly the distance between the fish and the detector. That cannot be built into a hand-held consumer product. Absent that, these devices will only scare people.

Note the pic in the OP showing the detector plugged in via an extension cable. I'd bet that they moved it around until magically it's measurement lined up with the other device.

Also, low levels of radiation are nothing to be concerned with. The linear no-threshold model (the direct relationship between radiation and cancer) is no longer considered appropriate when discussing very low levels.




I assume it is just marketing. This is cheap chinese device. And spec says:

> Measurement error – <30% within a given deviation between

For many people even 50% error is acceptable. It is just to check if house or hotel is safe. I live at place where radon, radioactive ashes, low concentrations of uran.. are credible danger.


30% is the error rate for measuring radiation AT the detector. In doing something like comparing pieces of fish, with all the factors mentioned above, I'd expect monumentally greater error rates, of several thousand percentages... rendering the device useless.

There is plenty of evidence that the stress created by a device like this, by an obsession with infinitesimal amounts of background radiation, does far more harm. I see no net health benefit from such products.

Fyi, a 25% error rate detector can be build using a soup can and some string. (Not a joke. This thing actually works.)

https://en.wikipedia.org/wiki/Kearny_fallout_meter


Just to kind of mirror what the poster you're replying to said, it is "unlikely" you could use this to accurately detect radon. This article[0] talks about some of the difficulties you may face and how much data you'd need to collect.

Considering how inexpensive and reliable radon test kits are, it may be advisable to stick to that.

[0] http://www.azomining.com/Article.aspx?ArticleID=192


I agree with the general sentiment that we shouldn't hound on this thing for not being very accurate - professionals are using professional equipment, and this is more likely aimed at preppers.

I am surprised to see that they list the operating temperature from 10 to 40c - I wonder why it stops working outside those bounds or how off those bounds are. It would love to see someone to order a few of these and review them in all sorts of different tests.




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