SOI LSURVI:Y BY DC ELECfRICAL RESISnVITYAND GAM MA •RAYS PECTROMF:lRY Tbe purpose ofthis work is 10 pre sent proced ures fo r reconn aissance o f so ils. based 0 11 DC elec trica l resistivity measurement s and gamm a-my spectrometry, T ile study area has 5 km 2 and is located in the Jurdim Bctflnico de Brasilia (Bra zil), :111 environmental co nservation area. In this urea. resistivity measurements were ob tained nt 190 d iffe rent points. and radiom etric measure ments (uranium, thorium, potassium. ami total co unt) at 9 differe nt poin ts. Apparent resis tivity values below 15000 Olnu .m we re observed in d ay so ils and between 15000 and ] O{}OOOluu .m in sandy so ils. It was also observ ed that radioa ctivity front c lay so ils is between HOOOand 14000 cps at total co unt. while in sandy so ils. this value is be low HO(X)cps. For the study area. although Ihe cl ay soils arc more radioact ive. the K/ U and Kr r h ratios arc higher in sandy so ils. This fact can be related with d ifferen ces in mineralogical co mpos ition of these materials. The process ing o f data prod uced an app are nt resistivity map for the study area and its integration with rad io metric data using a statistical procedure. the cluster analys is. T he products o f proc essing were compared with the so il map for 1() correlate the geo physica l units with different kinds o f so ils. Keywonls : geo physics. resisti vity. gumma-ray spectrometry. cluster analysis. trop ical so ils. RCSlI lIIO 0 objctivo dc stc unbulho C aprc scn tar procedimcntos para reco nhccim en to de so los. bnscndos em medir i >es de sua rcsistividudc clctricu c de sua mdioat ividndc natural. A area de cstudo possui 5 kill! c taz par te do Jnrdim Botflnico de Brasilia. lima unidndc de conscrvncno nmbicntal. Neste local ob tivcrnm-sc mcdidas de rcslstlvldudc e m 190 pont es disti ntos e 'linda mcdidas rudiomdtric as (urflnio. torte. ponissio C co mngcm tota l) em 9 pomo s distin tos. Ob scrvaram-sc vulorcs de rcsistividadc aparcnte infcriorcs a 15(XX) O hm.m para so los argilo sos ce ntre 15(X)() e ] (X}(}() Ohm.m para solos arcnosos. Ob scrvou-sc tambcm que a radioativida dc dos so los argilosos emais clc vuda, entre SOlX) e 14000 cps na contngcm total. <10 passe qm: nos arcnusos. cste valor sitna-sc abaixu de H()()() cps. Na area de cstudo. cm lxuu os so los argilosos sejum os mais rudioativos, verificou-sc que as razocs Kl U c Kfr h sat) mais elc vada s nos solos arenosos. fato cs te que (lode csrnr relacionado CO Ill d iferencas na co mpos icao rniucralogica destes materials. 0 proc essam cnto dos dados incluiu a confeccao de um mapa de resistividadc aparc ntc para a area de estudo c sua integrucao com os dados rudiometricos Ix)r meio de urn proccdi mento estatfstico. a ana lise de gl1JIX)S. Os produt os o btidos forum com parados co m 0 mupa de so los dispon fvcl. de modo a cstabelc ccr corrclac oc s entre os d ifcrentcs so los c os pudrfcs obscrvndos nos mapas gcoffsicos. P t l! a l'/'(/,\'-C-!UII '£,: gcoffsicu. rc slstivktad c. gumacspcctromctrin. untilise de a...