To establish eligibility for compensation under this subpart, a claimant or eligible surviving beneficiary must establish each of the following:

(a) The claimant was employed as a miner in a specified state;

(b) The claimant was so employed at any time during the period beginning on January 1, 1942, and ending on December 31, 1971;

(c) The claimant was exposed during the course of his or her mining employment to 40 or more working level months of radiation or worked for at least one year in a uranium mine or mines during the period identified in paragraph (b) of this section; and

(d) The claimant contracted lung cancer or a nonmalignant respiratory disease following such exposure.