[en] A procedure was developed to analyze radiological survey data from a contaminated material that has to be cleaned up or removed before the site can be released for unrestricted use. This procedure was coded in a FORTRAN computer program, RADVOL. The survey data are analyzed statistically by averaging over an area of 100 m₂and a depth of 0.15 m; the Kσ error is used to calculate the net count rate, where K depends on the confidence level required. The net count rates are converted to radionuclide concentrations and compared with the residual radioactive material guidelines to determine if the block (100 m₂ /times/ 0.15 m volume) is contaminated (above guidelines). The analytical results are plotted three-dimensionally, which perspectively illustrates the contamination level of each block. This procedure was tested by using radiological survey data from an actual site contaminated with radium. The results indicate that this procedure is easy to use and can be applied to those sites where radiological survey data are available. The uncertainties in the procedure are also discussed