The present Ordinance implements article 12b of the Atomic Energy Act of 23 December 1959, as amended and promulgated on 15 July 1985 dealing with verification of reliability of persons as a protection against a diversion or major release of radioactive material. As a protection against unauthorized acts which may lead to a diversion or major release of radioactive material, the responsible licensing and supervisory authorities are required to verify the requisite reliability of persons engaged in the handling or carriage of radioactive material and in the erection and operation of installations. Either a comprehensive reliability check (category 1), an extended reliability check (category 2) or a simple reliability check (category 3) shall be carried out. The text consists of 11 articles as follows: Sphere of application, definition of terms (1); Categories of reliability tests (2); Reliability tests to carry out (3); Obligation to carry out a reliability test (4); Rules for the different kinds of reliability tests (5); Proceedings (6); Termination of the reliability test (7); Duration of validity and repetition of reliability tests (8) Reliability tests in special cases (9); Transitional provisions (10); Entry into force, repeal (11).