摘要：Abstract
This study aims to evaluate the activity concentrations
of 238U, 226Ra, 232Th, 228Th and 40K along the
beaches of Kavala being adjacent to the rock-types of the
Kavala pluton. These ranged from 14–940, 16–1710, 26–
4547, 27–4488 and 194–1307 Bq/kg respectively, representing
the highest values of natural radioactivity measured
in sediments of Greece. The (%wt.) heavy magnetic (HM)
(allanite, amphibole, mica, clinopyroxene, magnetite and
hematite) fraction, the heavy non-magnetic (HNM) (monazite,
zircon, titanite and apatite) fraction and the total
heavy fraction (TH), were correlated with the concentrations
of the measured radionuclides in the bulk samples.
The heavy fractions seem to control the activity concentrations
of 238U and 232Th of all the samples, showing
some local differences in the main 238U and 232Th mineral
carrier. The measured radionuclides in the beach sands
were normalized to the respective values measured in the
granitic rocks, which are their most probable parental
rocks, so as to provide data upon their enrichment or depletion.
The annual equivalent dose varies between 0.01
and 0.35 mSv y−1 for tourists and from 0.03 to 1.48 mSv y−1
for local people working on the beach.
关键词：Keywordsnatural radioactivity beach sands granitic
rocks heavy magnetic and non-magnetic fractions annual
equivalent dose
