A gamma spectrometer measures the energy of each photon it detects and plots how many arrive at each energy. Each isotope leaves its own peaks, so the spectrum tells you whether a hot rock holds uranium or thorium, or whether a reading comes from potassium in food. Energy resolution, given as a percentage at 662 keV, sets how close two peaks can be and still be told apart. Lower is sharper.
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Best Gamma Spectrometers for Home Use: Scintillation and solid-state
- Radiacode 110#1 of 3Full review
The best detector for finding and identifying weak sources, from uranium glass to contaminated finds. Pair it with a high-range meter if you want emergency coverage.
Amazon $399$399Scintillator4,620 CPM/µSv/h400 µSv/h - Radiacode 102#2 of 3Full review
The cheapest way to get a pocket gamma spectrometer with a polished phone app. A great everyday detector for collectors and travellers.
Amazon $249$249Scintillator1,800 CPM/µSv/h1,000 µSv/h - Radiacode 103#3 of 3Full review
The Radiacode for people who mainly want isotope identification in a pocket size. If you just want dose readings, the 102 is enough.
Amazon $319$319Scintillator1,800 CPM/µSv/h1,000 µSv/h
