How to build a geiger counter. Question?

Does anybody kwon how I can build a anlogue geiger counter at home. My country does not have geiger couters at all and buying one seems impossibel now. Do you kwon how i could build one that mesures alpha, beta and gamma? And also I already kwon about the kfm i dont wnt that i want a geiger counter! ok tank you in advance and plz help.