Subject to the provisions of this section, this subchapter applies to a member of the National Teacher Corps. In administering this subchapter for a member covered by this section—

(1) “performance of duty” does not include an act of a member while—

(A) on authorized leave; or

(B) absent from his assigned post of duty, except while participating in an activity authorized by or under the direction or supervision of the Commissioner of Education; and

(2) in computing compensation for disability or death, the monthly pay of a member is deemed his actual pay or that received at the minimum rate for GS-6, whichever is greater.