01241naa a2200229 a 450000100080000000500110000800800410001902000180006010000160007824500600009426000090015430000100016350001230017352005710029670000170086770000200088470000170090470000200092170000200094170000180096177300320097916452681997-09-26       1997    bl uuuu     u00u1 u    #d  a85-86463-01-91 aCESAREO, R.  aX and gamma rays for imaging and trace elements of soil  c1997  ap.5-9  aIn: SIMPOSIO NACIONAL DE INSTRUMENTACAO AGROPECUARIA, 1., 1996, Sao Carlos, SP. Anais do I SIAGRO. Brasilia-SPI, 1997.  aThe study of the physical and chemical parameters of soils and relatedsubjects such as stone, sand, wood and so on is of grreat importance. The composition of the various solids in what concerns major and trace elements, and physico-chemical parameters such as density porosity, granulometry and permeability of liquids are exemples of important subjects. In this paper, the impact of X and gamma rays to soil studies, both for imaging (X and gamma-ray tomography, X-microtomography, X and gamma Compton tomography) and for trace element analysis, will be described.1 aBRUNETTI, A.1 aAPPOLONI, C. R.1 aCRESTANA, S.1 aCRUVINEL, P. E.1 aMASCARENHAS, S.1 aCUEVAS, A. M.  tBrasilia: EMBRAPA-SPI, 1997