RadLevelsEngland | 27x (8th Jan 2013) Please read attached info. Your answer to your question may be in the notes. @RadLevelsEngland | Uploaded January 2013 | Updated October 2024, 1 hour ago.
943cpm (27x above normal background radiation)
Time of video: 17:20hrs
Peek off camera 1050cpm (counts per minuet)
(34cpm is my normal background)
Rain swipe (UK)
Location: South Devon, England (10-15miles north of Plymouth)
Altitude 92meters
Date: 8th Jan 213 (8/1/13)
Ten min timed count @ 17:24hrs 874.8cpm
Geiger counter: Inspector EXP+
Weather: Heavy drizzle but had been raining.
Low level wind using Wind Alert:
Noss Mayo weather station in Devon
8 Jan 5:41PM
6 kph SW
Gusting: to 13 kph
North Atlantic Jet stream: Slow moving air mass of the stream is passing overhead at time off measurement. At 12:00hrs today according to Stormsurfing the edge of a slow moving air mass in the stream past Devon England. Currently in that slow moving part of the stream. stormsurfing.com/cgi/display_alt.cgi?a=natla_250
This fallout has not come from Europe as the low level wind maps show that the weather is coming from the South West. There are no nuclear reactor south of me only a Naval base called Devonport Dock Yards. There are several decommissioned nuclear submarines in dock. The Jet stream seems to be pushing nicely from the west.
Follow up test on sample.
I conducted a half life study and over three half life steps & the cpm dropped by approximately half every 33.4min.
874.8cpm (all ten minuet timed counts)
1st 462.6cpm (33.4min) 25cpm out from previous count
2nd 240.2cpm (33.4min) 9cpm out
3rd 135.0cpm (33.4min) 14.8cpm out
I believe the slight differences in the exact half of the previous timed count is due to my standard hand held timing using stopwatch and possibly another isotope decaying at slightly longer time (see below). But pretty consistent half life steps and well within the Inspector EXP +/- error margins.
Conclusion: When I first measured this swipe I saw over 1050cpm (30x) this isn't normal nor natural. Also even though Geiger counters are not isotopic detectors in most half life tables 33.4min is the half life of Cesium-138. You make ya own mind up!
Cesium-138 is a beta emitter and this sample was decaying mostly by beta decay, no gamma was detected above background. There was some small alpha decay in this sample, maybe this was from some Radon progeny in the sample namely Bismuth-212 which I believe is my usual natural washout. It has a half-life of 60.5min and decays at a branching ratio of 34% alpha, 64% beta. Bi-212 is daughter of Radon-220. The amount of alpha in this sample was far below 34%. If there was 64% beta decay and the sample decayed by half every 60.5min then we could say 'maybe' this was Radon progeny but in this case it wasn't.
943cpm (27x above normal background radiation)
Time of video: 17:20hrs
Peek off camera 1050cpm (counts per minuet)
(34cpm is my normal background)
Rain swipe (UK)
Location: South Devon, England (10-15miles north of Plymouth)
Altitude 92meters
Date: 8th Jan 213 (8/1/13)
Ten min timed count @ 17:24hrs 874.8cpm
Geiger counter: Inspector EXP+
Weather: Heavy drizzle but had been raining.
Low level wind using Wind Alert:
Noss Mayo weather station in Devon
8 Jan 5:41PM
6 kph SW
Gusting: to 13 kph
North Atlantic Jet stream: Slow moving air mass of the stream is passing overhead at time off measurement. At 12:00hrs today according to Stormsurfing the edge of a slow moving air mass in the stream past Devon England. Currently in that slow moving part of the stream. stormsurfing.com/cgi/display_alt.cgi?a=natla_250
This fallout has not come from Europe as the low level wind maps show that the weather is coming from the South West. There are no nuclear reactor south of me only a Naval base called Devonport Dock Yards. There are several decommissioned nuclear submarines in dock. The Jet stream seems to be pushing nicely from the west.
Follow up test on sample.
I conducted a half life study and over three half life steps & the cpm dropped by approximately half every 33.4min.
874.8cpm (all ten minuet timed counts)
1st 462.6cpm (33.4min) 25cpm out from previous count
2nd 240.2cpm (33.4min) 9cpm out
3rd 135.0cpm (33.4min) 14.8cpm out
I believe the slight differences in the exact half of the previous timed count is due to my standard hand held timing using stopwatch and possibly another isotope decaying at slightly longer time (see below). But pretty consistent half life steps and well within the Inspector EXP +/- error margins.
Conclusion: When I first measured this swipe I saw over 1050cpm (30x) this isn't normal nor natural. Also even though Geiger counters are not isotopic detectors in most half life tables 33.4min is the half life of Cesium-138. You make ya own mind up!
Cesium-138 is a beta emitter and this sample was decaying mostly by beta decay, no gamma was detected above background. There was some small alpha decay in this sample, maybe this was from some Radon progeny in the sample namely Bismuth-212 which I believe is my usual natural washout. It has a half-life of 60.5min and decays at a branching ratio of 34% alpha, 64% beta. Bi-212 is daughter of Radon-220. The amount of alpha in this sample was far below 34%. If there was 64% beta decay and the sample decayed by half every 60.5min then we could say 'maybe' this was Radon progeny but in this case it wasn't.
