The March 25 0,4 10 to 15h0,6 and to 0,64 to 18h00
seems to me much because I find with my old dosimeter 15 years Voltcraft and rather 0,14 microsieverts fluctuating 0,07 to unchanged 0,19 15 years later, a little more than 0,08 to 0,13 (the Vesinet) microsieverts on the map in the Paris region .
Measurements can fluctuate with cosmic rays (high) radon currents of air, (stronger of the Puy de Dome or the Midi St Laurent or water or granite Limousin), etc ..
Unless a radioactive cloud RELEASED has passed, French or Japanese, because nuclear power plants release of tritium and other that are allowed and which may explain higher values on the map near some different plants mean values, Saint Laurent waters ?????!!
We must continuously record and then watch jumps relachage ??
But the sheaves of sometimes huge cosmic rays, can explain.
Finally taking a good filter vacuum cleaner wet end that turns out to 10 15 minutes, harvest all if radioactive dust and must have a higher level close to the filter which collected lots of ambient air dust ..