A fume hood used for Beta and Gamma radiation shall be called as radioisotope fume hood. Construction of this fume hood same as standard bench mounted fume hood except its lining and work surface must be of SS304 material. All inside corners of upper unit must be coved seamless welded in order to clean and decontaminate the surfaces exposed to radioactive material. SS 304 work surface welded with lining must be dished to contain spillage and reinforced to carry the load of heavy lead bricks. The load bearing capacity of radioisotope fume hood work surface should be minimum 200 pounds per square feet to 1000 pounds per fume hood.