94-4130 - Laserfiche WebLink

Browse Search

,'..., o. :o.'!.~~i}';;-;~.l'~1:': P_12l2 ~ .Specifications for }.,ead Shieldi~g A. Th.e shielding must extend from the floor to a height Of seven fe~t cQntioU(lusly, with 'no holest gaps or omissions. Any perfQration$ in the shielding (such as for electrical boxes, switches, view boxes, etc.) must he covered or ba<.~ked by lead sheeting of thkkness not less than that which is used itl adjacent walls in order to maintain shielding continuity. In t.be event the seven foot level as' measured from the interior of the room being shield- ed does not provide shielding to a height of seven feet to an occupieda'rea on the other side of that wall, addjtjonal shielding may be required. This si~uatjon has been observed when the floor of the room being ~hielding is either SIigJltly below grade or during a renovation the new area is between floor levels of the old area. ! B. .Eachshect of lead must overlap the next by at least one-quarter inch (1/4") and it is not necessary that fasteners be of the lead-head va.riety. or be covered with lead so long as no fastener is removed leaving a hole in the shielding. c. An doors and door frames installed into lead. lined walls in this room must provide shielding the equivalence of the lead thickness which is re- quired for the walJ into which the door is installed. This is most simply and accurately assured by using doors and door frames lined with the appro- priate thickness of lead; provisions must be made to assure that the hard- ware used is suitable for the increased weight of this door. D. The leaded acrylic or leaded glass window in the Control Barrier must provide protection of lead equivalence not less than the Control Barrier wall in which it is installed and must he framed in lead so designed as to assure shielding continuity and integrity. There must also be an accomm<wation for clear communication between the operator and the patjent. "'.':~ E. Additional shielding must be placed behind the wall mounted ca.ssette bolder for chest radiography; a four feet by seven feet (4'X7') sheet of 1.0 mm of lead must be centered behind the wall nlountcd cassette for chest radiog"raphy in order to accommodate this routine ptin1ary exposure. The cbest Dack must not be placed on the same wall as the entrance to the opE;ra~ tor protected area behind the Control Barrier. .._-_..~~~----~---.,.--~-~.~----~-~---~_.. ------- P.03