Uncertainty evaluation by gamma transmission measurements and CFD model comparison in a FCC cold pilot unitC.C. Dantas, A.E. Moura, H.J.B. de Lima Filho, S.B. Melo, V.A. Dos Santos and E.A.O. LimaInt. J. Metrol. Qual. Eng., 4 1 (2013) 9-15DOI: https://doi.org/10.1051/ijmqe/2012031