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Lotic7
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I purchased a RadiationD-v1.1(Cajoe) geiger counter off ebay, and attached an arduino nano and a 16x2 display ( I got the instructions off this site https://www.instructables.com/id/Arduino-DIY-Geiger-Counter/). I noticed that the counter was sensitive to UV when I had it out in the sunlight, so I decided to expose it to several UV sources.
Background Radiation - Average 25.4 counts per minute
Background Radiation inside wooden box – Average 20.4 counts per minute
Incandescent Light Bulb (Frosted Soft White 60 Watt Globe 130 Volt BB 0903)
1st minute 39 counts
2nd minute 35 counts
3rd minute 40 counts
4th minute 29 counts
Incandescent Light Bulb (Frosted Phillips Duramax 60W/120V China 1F)
1st minute 317 counts
2nd minute 203 counts
3rd minute 104 counts
4th minute 112 counts
5th minute 48 counts
6th minute 27 counts
COBB Led Head Lamp – Average 61.7 counts per minute
Fluorescent 13W mini twister Phillips – Average 940 counts per minute
405nm Laser Pointer – 106385 counts per minute the laser pointer was aimed at the point where the anode enters the glass envelope (Green and Red laser pointers had no effect)
UV LED flashlight – Average 35753 counts per minute
UV Tube blacklight (battery powered) - Average 67466 counts per minute
UVB Reptile bulb 13W fluorescent – Average 622211 counts per minute
UVC germicidal tube – got one count of 10314 and then the screen scrambled. The Geiger counter had to be restarted. The screen would start garbling, but the counter would still beep. This was done in a closed wooden box to reduce the exposure to UVC.
What could be done to prevent the screen from scrambling when measuring UVC? Would shielding work? Or should I increase the distance between the UVC tube and the counter?
Why would the incandescent bulbs be emitting UV? Could there be some mercury or halide vapor in the bulb?
Background Radiation - Average 25.4 counts per minute
Background Radiation inside wooden box – Average 20.4 counts per minute
Incandescent Light Bulb (Frosted Soft White 60 Watt Globe 130 Volt BB 0903)
1st minute 39 counts
2nd minute 35 counts
3rd minute 40 counts
4th minute 29 counts
Incandescent Light Bulb (Frosted Phillips Duramax 60W/120V China 1F)
1st minute 317 counts
2nd minute 203 counts
3rd minute 104 counts
4th minute 112 counts
5th minute 48 counts
6th minute 27 counts
COBB Led Head Lamp – Average 61.7 counts per minute
Fluorescent 13W mini twister Phillips – Average 940 counts per minute
405nm Laser Pointer – 106385 counts per minute the laser pointer was aimed at the point where the anode enters the glass envelope (Green and Red laser pointers had no effect)
UV LED flashlight – Average 35753 counts per minute
UV Tube blacklight (battery powered) - Average 67466 counts per minute
UVB Reptile bulb 13W fluorescent – Average 622211 counts per minute
UVC germicidal tube – got one count of 10314 and then the screen scrambled. The Geiger counter had to be restarted. The screen would start garbling, but the counter would still beep. This was done in a closed wooden box to reduce the exposure to UVC.
What could be done to prevent the screen from scrambling when measuring UVC? Would shielding work? Or should I increase the distance between the UVC tube and the counter?
Why would the incandescent bulbs be emitting UV? Could there be some mercury or halide vapor in the bulb?