All Forums  GQ Electronics Forums  2.GQ Geiger Muller Counter  GMC 600+/DP-66M comparison

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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 Bobakman[/i] [br]Nothing scientific here just a simple comparison as best I could measuring a broken Fiestaware piece with my GMC 600+ and a vintage Polish DP-66M given to me as a gift from my Son. I can't really compare Apples to Apples here obviously with the Software and LND-7317 with the vintage electronics and the low range probe in the Beta window of the DP-66M a STS-5 /(CTC-5). I added a bit of packing tape over the 600+ window to simulate the plastic over the DP-66M beta window again the STS5 (CTC-5) is a metal encased probe so it is what it is. I was surprised though to see that the mR/h readings were almost, if not spot on. The DP-66M read consistently from 3.5-4mR/h where the 600+ was reading 3.6 almost 3.7 mR/h. The DP-66M actually has two other glass cased GM tubes installed in the wand as well. As I understand it these are primarily for the high range readings? Data on the STS-5 (CTC-5) Probe Gamma radiation sensitivity (Cs137): MED – 0.28mkR#8729;s-1 Operating Voltage Range (volts): 360 – 440V Starting voltage (volts): 280 – 330V Geiger plateau length: not less than 80 V Plateau slope: no more than 0.125%/V Maximum natural background : 27 pulses / min or 0.45/s Load resistance : 5 10 MOhm Allowable stray capacitance of input circuits : 10 pF Transit capacitor : 7 10 pF Operation temperature range: -40 to +50C The maximum operating MED 2500 s-1, 30mkR#8729;s-1,k.n.± 20% The maximum permissible MED dose – at least 50R#8729; h-1 Length: 110 mm Diameter: 12 mm Weight: 8g [img]uploaded/Bobakman/20230213015754STS5_CTC5.jpg[/img] Info. From Here: [https://www.pocketmagic.net/tube-sts-5-#1089;tc-5-geiger-tube/] Bob [img]uploaded/Bobakman/20230213010850IMG_3698RZ.jpg[/img] [img]uploaded/Bobakman/20230213010756IMG_3693RZ.jpg[/img] [img]uploaded/Bobakman/20230213010937IMG_3699RZ.jpg[/img] [/quote]    Insert an Image File Check here to include your profile signature.