The employer, in whose employment an employee was last exposed to ionizing radiation, shall be liable for all awards of compensation should such employee suffer an ionizing radiation injury, disability or death. If, however, such ionizing radiation injury, disability or death is attributable in part to exposure to ionizing radiation which such employee received in any previous employment, the employer who is made liable for all awards of compensation as provided by this section may appeal to the Workers' Compensation Commission which shall apportion such liability among the several employers in whose employ the employee was exposed to ionizing radiation. The method of apportionment shall be determined by the commission.
S.C. Code § 42-13-50