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<br />08/0 21 ~ P 0 4_;L2. ;_~~ _fb-~. .._, . ... <br /> <br />\JWm <N'-A:l/~~.as <br /> <br />Discussion <br /> <br />In geueral, calou1ated shielding js often overestimated due to ~tions on workload, <br />use factors and occupancy :factors.- I have attempted to proVide more realistic 'filctors <br />bll8ed on infOzmation from. the &oil1y and modified OCCuptmcy estimates. The <br />workload is set high enough to alliitw for an minor increases without requiriag further <br />shielding. <br /> <br />No additional sbielding is uSUally ~ed for the ceiIing or the floor. If the outside walls are <br />constructed of of m: least three iocliles of concrete block, no qdttitional shielding is USlIal1y <br />reco:rnm~ded. <br /> <br />All lead sheeting should e:rtend to a height of at least 7 n,et above floor level Nail heads <br />do not need to he overlapped. Overlying drywaIl seams shoulii be offset and great care <br />should be e)(ercised in taping and li8sterloi the seams. No gaps in drywaIl are B.lXleptable. <br /> <br />ADy questions concerning this repo.n may be directed. to John Barton, M.E..DABR. <br />Florida MedicnI Physics, Inc., 626 Park Forest Ct, Apopka, FIl. 32703, <br />telephone (407)303-2068 <br /> <br />~~ <br />Cal Physicist <br /> <br />References <br /> <br />(1) Simpkin, DOUihrs J., EvaIua1iOit of'NCRP Report 49 asswnptlO'rls OD workloacb and use <br />faotolS in dillgJ10stia radiology i8eilities~ Medic:al Physios. Vo123. No. 4., pp.577~'84. April 1996 <br /> <br />(2) Simpkin, Douglas J., 'I'ranaJuissicm Data 1br Shielding Diagnost{o X-Ray F~lities <br />Health Physics, Vol 68, No. S, pp.704-708. May 1995 <br /> <br />(3) National Cotlnc:i1 011 Radiation ~Il aud Measuremellts (NC.RP) Report 49. <br />Strueturlll Shielding Design 8DdJ:EwlU2tion for Medical Use of X-Rays and GamrM Rays <br />of&ergil!l/i up to 10 MeV, U.S. PrintinJ Office., 1976 <br /> <br />(4) Florida Adminilltrative Code 6413-5, (Radiation Pn;ltection RegulatiOJ19) <br /> <br />141 003 <br /> <br />p,DS <br />