Thursday, May 26, 2011

Radiation in Goes - Live graphs

Latest graphs. 

Update 2011-05-26 22:19 CEST: Tonight around 21h, the readings from the FH40T suddenly ceased. No more clicks were detected. After some initial testing, no immediate cause for this malfunction could be found, the FH40T detection electronics seemed dead but the G.M. tube was still OK.

After an interruption of about an hour, I was able to continue the measurements with a spare (D.I.Y) counter circuit that I had already built, using the same G.M. tube FHZ76V.
 
SI8B CPM measurement








Last month's radiation graph, normal background levels. 
Sun 04 sept at midnight: Raindrops leakage on GM tube and electronic circuit causing a spike and dropout of measurement. Fixed next morning.
Tue 28 june: Heavy rain and thunderstorms caused huge peak.
A lightly decreasing trend since the beginning of my measurements can be seen in the month graph. Did we experience Fallout from Fukushima before my measurements started, which is now slowly decreasing due to the half-life of the nucleides ?

Images kindly hosted by dead-men.de
at

1 comment:

  1. katzeJuly 14, 2011 at 11:50 AM

    I asked myself for a while, why thunderstorms always cause you these peaks - because natural radiation should not be influenced by thunderstorms and only to a small degree by rain.
    My guess is that the flashes cause ticks in your counter. Try the following: Put your device close to a Halogen or "Leuchtstoffroehre"-Lamp and switch it on and off several times.
    I finished my selfmade counter and thought it would be rather robust and not vulnerable to disturbances - but I tried the scenario described above with my two desk lamps, and they induce large errors in the reading.

    Let me know if my guess applies in your case, too.

    Greetings, katze

    ReplyDelete