All Forums  GQ Electronics Forums  2.GQ Geiger Muller Counter  Background over water

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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]Just returned from a little bit of sailing on a bigger inland body of water, and kept my Geiger counter below deck with history saving every minute. Here is the result (readout with GeigerLog): [b]Image Insert:[/b][br][img]uploaded/ullix//Auswahl_004.png[/img][br][size=1] 55262 bytes[/size=1] When on land the background is CPM=19.4, while over water is is only CPM=13.3. The altitude of the water is at sea level (actually, 1 foot below), while the land is at ~80m. So, the reduced background over water could be influenced a little bit from reduced cosmic rays, but I think the majority is due to the lack of nearby soil, rocks and building materials when on a boat consisting mostly of plastic, wood, aluminum and steel. As the instrument background is specified by GQ as "<0,2pulses/s", equivalent to CPM=<12, almost all residual background might be originating from the instrument, and almost nothing from cosmic rays. Though the "<" sign could mean anything from an instrument background of 0 to 12. [/quote]    Insert an Image File Check here to include your profile signature.