https://ocw.mit.edu/courses/22-s902-do-it-yourself-diy-geiger-counters-january-iap-2015/resources/mit22_s902iap15_rev6bom/
MIT22_S902IAP15_Rev6BOM.xlsx | Do-It-Yourself (DIY) Geiger Counters | Nuclear Science and...
MIT OpenCourseWare is a web based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity
do it yourself