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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by ullix[/i] [br]@David, interesting scenario.My guess: the counter ist overpowered with too much radiation. Linear accelerators Generally Produce particles Like protons, Electrons. Ist that what you get and are trying to measure? If it is Gamma, do you know energy (MeV)? Geiger pulses last some 100 mikrosec, some tubes more, some less. I think i measured M4011 at 125. So, theoretical max countrate is cps<=10000. In reality, and considering Poisson distribution of counts, max will be closer to cps=3000, which happens to be what you have seen. At higher counts the counter only sees one blurr of stuff, and its electronic may be unable to find any counts, hence your empty records. There is a second effect, which also paralyses a counter: a high count rate results in a high current being drawn thru thetube, which results in the anodevoltage collapsing. Then also nocounts is the outcome. The remedy is the same for both situations: reduce countrate! First, if you can, increase distancebetween source and counter to take advantage of the 1 over distance-squared law. If not possible, reduce counts by wrapping counter in absorbing material. High atomic weight, like lead, is best but perhaps not available. Lead > (is better than) Copper > Iron > Aluminum > Wood. But Lightweight needs bigger wall thickness. For aluminum, like kitchen foil, und be prepared for 5...10mm! Stone is also possible, think of ceramic bathroom tiles. Some experimentation required! Let us hear the results. [/quote]    Insert an Image File Check here to include your profile signature.