These are 4X4 Sodium Iodide (NaI::Tl) detectors removed from a conveyor system designed to detect very low levels of gamma radiation. These detectors are much more sensitive than the standard NaI detector used to measure radiation background (typically a 2X2). These detectors have good plateau’s and work very well. This is a very sensitive detector at a great price. It will very easily see variation in natural background, let alone any radiological impact at your site.
When Fukushima happened, we were inundated with requests for survey meters. We talked a whole lot of people out of buying meters and the usual equipment is not sensitive enough to measure background fluctuations necessary to determine if crops or food is contaminated. This is the sort of thing that you will need to use for that!
These detectors are great for portal monitors, or performing walkover surveys of areas to look for elevated radioactivity. You would be surprised how much radiation can be detected almost anywhere. These detectors will see it if it is there.
We have meters you can use do operate these detectors. They have all been tested and have great response with good plateau’s. This is a great deal on a very large NaI detector. Bigger is better when it comes to these.