2. Every licensee must keep—
(a)food which awaits irradiation at the licensed facility on a part of the facility which is separated by a wall or barrier from any part of the facility where food which has been irradiated is kept; and
(b)all food which is either awaiting irradiation or has been irradiated on parts of the facility which are separated by a wall or barrier from any part of the facility on which other food is kept in the course of the business.