Daily averaged radon
concentrations were calculated and are shown as
the thick dark line in Figure 7. Five radon peaks
were observed and registered as peak-1 to peak-5
(Figures 8, 9 and 10). The peak-1 anomaly (23.75 count/10 min on 18 February) was an isolated
peak, with a peak width of 3-4 d rising and falling
to a mean value (20.74 count/10 min), whereas
peak-2 (30.25 count/10 min on 1 March,
corresponding to peak B in Figure 7), peak-3 (29.0
count/10 min on 4 March) and peak-4 (27.37
count/10 min. on 6-7 March) could be combined
into a single, wide peak with a peak width of 8-9
d (or 11-12 d if peak-5 were included).