The regulations in this subpart describe the criteria for eligibility for compensation under sections 4(a)(2) (A) and (B) of the Act and the evidence that will be accepted as proof of the various eligibility criteria. Sections 4(a)(2) (A) and (B) of the Act provide for a payment of $50,000 to individuals who were exposed to fallout from the atmospheric detonation of nuclear devices at the Nevada Test Site due to their physical presence in an affected area during a designated time period and who later developed one or more specified compensable diseases.