This standard establishes minimum acceptable performance criteria for health physics instrumentation for use in ionizing radiation fields under extreme environmental conditions. Included are testing methods to establish the acceptability of each type of instrumentation. This standard does not specify which instruments or systems are required, nor does it consider the number of specific applications of such instruments. This standard supplements the basic performance requirements for health physics instrumentation as specified in ANSI N42.17A [2]. Specifications in this standard are expected to be called for by the user as required and should not be considered as general specifications.