This International Standard specifies the performance and testing of DOSE AREA PRODUCT METERS intended to measure DOSE AREA PRODUCT and/or DOSE AREA PRODUCT RATE to which the PATIENT is exposed during MEDICAL RADIOLOGICAL EXAMINATIONS. This standard is applicable to the following types of DOSE AREA PRODUCT METERS: a) FIELD-CLASS DOSE AREA PRODUCT METERS normally used for the measurement of DOSE AREA PRODUCTS during MEDICAL RADIOLOGICAL EXAMINATIONS b) REFERENCE-CLASS DOSE AREA PRODUCT METERS normally used for the calibration of FIELD-CLASS DOSIMETERS. NOTE REFERENCE-CLASS DOSE AREA PRODUCT METERS may be used as FIELD-CLASS DOSE AREA PRODUCT METERS. The object of this International Standard is 1) to establish requirements for a satisfactory level of performance for DOSE AREA PRODUCT METERS, and 2) to standardize the methods for the determination of compliance with this level of performance. Two levels of performance are specified: a lower level of performance applying to FIELD-CLASS DOSE AREA PRODUCT METERS; a higher level of performance applying to REFERENCE-CLASS DOSE AREA PRODUCT METERS;