http://www.bunkerofdoom.com/nuclear/detect/index.html
tuka ima objasnuvanje za osetlivosta na nekoi kristali na radioaktivnost
If the Geiger counter has a sensitivity of 1x, then here are the sensitivities of various scntillation crystals when used with photomultiplier tubes:
30x Plastic Scintillator (presumably the fluid as well)
100x NaI(Tl) Sodium iodide activated with Thallium
125X CsI Cesium iodide
200X BGO Bismuth germanate