ABSTRACT. Thi s a rticle a ims to give a comp rehensive vi ew of the distributi on patte rns [or na tura l and artifical r a di onucl ides ove r Antarctica. \Ve foc us this stud y on 137 Cs, 210Pb and tritium . Appl ying vario us statistica l m ethods, we show th at the depositio n or rad ionuclid es revea ls a struc tured di stributi o n, although loca l d r ift red istributi on a nd the snow-s urface roughness disturb th e representati ve ness o f sa mpl es and produce a "noise" effec t. The depos iti on o f m C s over Anta rctica (885 TBq ) re presents O.OQ% of the to ta l depositio n of thi s radio nuclide in the wo rld a nd the cor rel a ti o n betwee n 1.37 Cs nuxes a nd acc umul ation shows two sub-popul ati o n s. For the stati o ns w ith a mean a nnu a l te mperature a b ove -21 QC, a stro n g correla ti o n is found, wh ereas th e co rrel a ti o n is lowe r for locati o n s vv ith tcm p e ra t u res below -21 DC . Th e nu x o f 210 Ph \'a ri es fro m 0.9 to 8.2 Bq m 1 a I with values stron g ly correlated w ith the acc umul a ti o n a nd a well-defin ed spati a l structure. Th e same m ec h a nism gove rns the depositi on o f a rtificial a nd n a tural tri tium but it clearl y differs from that of' oth er ra di onuclide assoc ia ted with parti c ul a te materi al.Th e "dr y fa ll-out" acco unt for between 60 a nd 80% or th e to ta l fa ll-out for th e artificia l radi onuc lides a nd a round 40 % for 2lo Pb. This difTerence is likel y related to a tropos pheric fr ac ti on for 21OPb. Despite its isolated locati on, the radi oacti ve f'a ll-out of ar tificial longli ved ra di onuclides ove r A nta rcti ca has b ecn te n tim es greater than for n a tural radiolluclides.
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