Radiation shelter

Claim 1

A RADIATION SHELTER HAVING SIDE WALLS AND A ROOF SUPPORTED AT LEAST IN PART ON SAID SIDE WALLS, SAID SIDE WALLS INCLUDING SPACED INNER AND OUTER WALL PORTIONS AND CONTAINING A RADIATION ABSORBING MATERIAL THEREWITHIN, EACH OF SAID WALL PORTIONS COMPRISING A PLURALITY OF PANELS JOINED TOGETHER AT THE ADJACENT SIDE EDGES THEREOF, THE PANELS OF SAID INNER AND OUTER WALL PORTIONS BEING ARRANGED DIRECTLY OPPOSITE ONE ANOTHER, THE SIDE EDGES OF SAID PANELS BEING FORMED WITH FLANGE SECTIONS WHICH LIE ALONG PLANES TRANSVERSE TO THE PLANE OF SAID SIDE WALLS, THE INNERMOST EDGE OF EACH OF SAID FLANGE SECTIONS BEING FORMED WITH A SHOULDER PORTION WHICH EXTENDS PARALLEL TO THE PLANE OF SAID WALL PORTIONS, THE FLANGE SECTIONS AND SHOULDER PORTIONS ALONG ONE SIDE OF EACH PAIR OF OPPOSED PANELS BEING ADAPTED TO ENGAGE THE FLANGE SECTIONS AND SHOULDER PORTIONS ALONG THE SIDE EDGE OF THE ADJACENT PAIR OF OPPOSED PANELS WHEREBY THE FLANGE SECTIONS OF EACH OF SAID PAIR OF OPPOSED PANELS ARE CONTINUOUSLY ORIENTED, SAID SIDE ALLS FURTHER INCLUDING A PLURALITY OF VERTICALLY EXTENDING ANGLE IRONS HAVING PERPENDICULAR LEG PORTIONS, SAID ANGLE IRONS BEING ARRANGED ADJACENT SAID FLANGE SECTIONS OF SAID PANELS WHEREBY ONE LEG PORTION OF EACH OF SAID ANGLE IRONS EXTEND PARALLEL TO THE PLANE OF SAID SIDE WALLS AND WHEREBY THE OTHER LEG PORTION OF EACH OF SAID ANGLE IRONS EXTENDS PARALLEL TO SAID FLANGE SECTIONS, A PLURALITY OF WEB MEMBERS EXTENDING TRANSVERSELY TO THE PLANE OF SAID SIDE WALLS AND ARRANGED ONE ADJACENT AT LEAST ONE SIDE EDGE OF EACH PAIR OF OPPOSED PANELS, FASTENING MEANS SECURING SAID ANGLE IRONS AND SAID WEB MEMBERS TO SAID FLANGE SECTIONS AND FOR SECURING THE ADJACENT FLANGE SECTIONS OF THE ADJACENT PAIRS OF OPPOSED PANELS TOGETHER, AND CHANNEL MEMBERS OF GENERALLY U-SHAPED CROSS SECTION ALIGNED WITH AND CLOSING TOP AND BOTTOM OF SAID SIDE WALLS.