The Geiger-Miller counter, ma ọ bụ Geiger counter maka nkenke, bụ ngwá ọrụ agụta e mere iji chọpụta ike nke radieshon ionizing (ụmụ irighiri alpha, beta particles, gamma rays, na X-ray).Mgbe voltaji etinyere na nyocha ahụ ruru ebe ụfọdụ, ụzọ ion nke ọ bụla ionized site na ray na tube nwere ike ịbawanye ka ọ mepụta usu eletrik nke otu nha ma dekọọ ya site na ngwaọrụ eletrọnị jikọtara ọnụ, si otú a na-atụle ọnụọgụ ụzarị ọ bụla. oge unit.