Calibrating device of radioactive surface contamination instrument

The utility model belongs to the technical field of nuclear power ionizing radiation metrological verification, and particularly relates to a radioactive surface contamination instrument verificationdevice which comprises a detector moving disc bracket, a detector moving disc, a scale, a rotating bearing, a support base, a source moving disc, a source moving disc bracket and an adjusting nut. Wherein the detector moving disc bracket is connected with the support base, the detector moving disc is placed on the detector moving disc bracket, the source moving disc is inserted into the source moving disc bracket, and the source moving disc bracket is arranged below the detector moving disc bracket; the source moving disc bracket and the ruler are both fixed to the support base, the ruler is connected with the rotating bearing, and the ruler is further provided with an adjusting nut. The detector moving disc bracket, the scale, the rotating bearing, the support base, the adjusting nut andthe source moving disc bra