The importance of intercomparison programme for radiation therapy dose delivery at radiotherapy centres (RC) has widely been reported. We at Nuclear Malaysia Agency (NM) intend to develop a national level intercomparison programme in terms of absorbed dose to water Dw. We started with one RC which has voluntered to participate in the programme in the dose delivery of 6 MV x-ray beam. Two types of comparison were made to get the accuracy. Type I is based on the measured value of the Dw at reference depth, Dw(zref)mea : RC results was compared with NM, in which NM results was taken as a standard. Type II is based on calculated value the Dw(zref), Dw(zref)cal : both NM and RC results were compared with Dw(zref)cal, in which Dw(zref)cal was taken as a standard. Two on-site measurements were made at this centre to check for results consistency and to get the average accuracy. Results obtained were consistent for the two measurements and the average values in the accuracy are within the acceptable accuracy limit of ± 3%, namely Type I: 1.10 ± 0.58 % for the RC, and Type II: 0.99 ± 0.60 % and −0.11 ± 0.26% respectively for the RC and NM.