Dose-Rate Measuring in Hard Tenniscourts
T. Milassin, Á. Kovács, S. Börcsök
Hungarian State Public Health Service, Csongrád County Institute,
Szeged, Hungary
CEJOEM 1997, Vol.3. No.4.:333
Everybody says: sports in the open air are healthy.
Really, is a tennis-court that healthy?
The well-known problems around the use some of clinkers in buildings led
us to examine the hard courts – what dose-rate can we measure beyond the
natural background? All of the examined open-air tennis-courts had been
covered with the same red clinker.
We examined the in situ dose-rate (unit of measurement
nGy/h) with a Berthold Umo radiometer, and samples were measured in our
laboratory with the high resolution CANBERRA measuring system with a low-temperature
Ge-Li detector.
The in situ measuring gave a dose-map. The dose-map
shows the frequented areas of the field very well: these places gave higher
radioactivity. This is probably correct, because the thickness of the replaced
red clinker coating and the measured dose-rate are in correlation.
The analysis of the samples produced very interesting
spectra. All of them contained a high amount of K40; Th, U and their daughter-elements.
The occurrence of the radioactive elements was the same in the three clinker
samples. These elements are the primordial radionuclides, they ere as old
as the Earth. These nuclides are emitting a and b particles and g-photons.
The high rate of the corpuscular radiation is verified in the in situ measurement,
the total dosage being reduced fast in the height.
According to the results sportsmen and workers on
the field may acquire higher through no dangerous amount of irradiation
during their activities.
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