Average Reviews:
(More customer reviews)This is a fun toy to use for science projects. I can't comment on its accuracy one bit, though it's clear that it does work. (Point it at your smoke detector or old watch face.) The manufacturer claims to sell a lab-calibrated version.
I used it to take readings of some granite boulders in the California Sierras that I suspected of contributing to some unusual radon levels on some property I'm developing there. (Yes, they measured "above background".)
The detector doesn't have a whole lot of surface area (like some of the other competing solutions) but depending on your need, this might or might not be a problem.
The box *looks* like a science project too. The case is a run-of-the-mill project case you could find at Radio Shack, and the display pokes through a cut-out on the top. A small microprocessor inside talks to the the displays, and allows you to gather count data through an RS-232 (DB-9) serial connector poking out on the right. (Software included.)
The thing that makes this counter a little different is the CPU in the box, giving the designers a bit more flexibility to add features (like counting in different units, using different time scales and implementing serial-port support). It has a mute switch too.
If I were to build a counter as a project, this is how I would do it. But I'd use a nicer case. Maybe.
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Images SI Inc's Digital Geiger Counters are useful for detecting and measuring radioactivity. The model GCA-04 has an internal geiger mueller tube. It's applications are: Education - Classroom demonstrations and experiments; Emergency Services and Domestic Preparedness; HAZMAT and Compliance Verification; Dirty Bomb Screening and EMT's. It detects the following types of radiation: Alpha above 3.0 MeV; Beta above 50 KeV; Gamma above 7 KeV. The Geiger Mueller (GM) Tube detector is Ne + Halogen filled. The GM tube's end window is made of Mica, with a .38 effective diameter and a density of 1.5-2.0 mg/cm2. The Liquid Crystal Display (LCD) is 16 character by 2 line that provides an easy to read output. Switch selection allows Geiger Counter to measure and convert radiation (counts per second) into in mR/hr or mSv/hr. Factory calibration insures accurate measurement. Secondary indicators; audio (clicks) and visual (LED) included. Also includes a headphone jack and a power jack for external power. The GCA-04 outputs serially the counts per second to our Windows PC program for charting and recording the measured radiation over time. Serial cable RS-232 adapter is an available accessory.
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