Except in prescribed cases, compensation, whether on an interim or a final award, shall be paid in a lump sum.

It shall be the duty of the Board to give a claimant written notice of the amount of an award.

A claimant shall not be entitled to a payment unless the Board have received from him written notice to the effect that he has received a notice under sub-paragraph (2) above and accepts the amount of compensation specified in the notice as the proper amount.