Document 3eR06jB4Q9L3Kqex9mEw3JaK0

'p lV.JiM M , iU H U m w n 'Umm, I i/JU'IUJHJIJ, I l LIA23633 LEAD INDUSTRIES ASSOCIATION, INC. 2a MADISON AVCNUt Nrw YORK 17, N. V. February 26, 1963 SUBJECT: REPRINT CM RADIATION PROTECTION To Kuchers of the Lead Industries Association, Inc.: Enclosed Is a reprint of an article which appeared in the Reference Data Section of "Air Conditioning, Heating and Ventilating," February, 1963, issue, entitled "Radiation Protection at Wall Openings for Duct or Pipo." He plan on using this reprint to handle inquiries on this subject. Additional coplea are available free of charge in quantities up to 25. Over 25 copies nay be obtained fron us at our cost of each. Sincerely yours. DKBiKHH David H. Borclra Secretary 11 Look A/>ee</ nrtn rSib j ." ywwwn,nfffii>m)Bii^ r.yf*.*pg*ww rgwir.uy1 .i h h mj mfHUtJJuJ -- - --' .. --' S' LIA23634 ; . , . ... _ . ! -. . - --- ---- i *" -a* - - " --- - '*> -- n '- -. < w. i -- '-- * '* -- -"L RADIATION PROTECTION AT WALL OPENINGS FOR DUCT OR PIPE Harrison 0. Goodman* and Gaorga Hollands** Ihf purpose of thox data sheets U *o acquaint the air cixidiiKXimg engineer with the mfint fix shielding ductwork and other ripenings inat pee1fale pfiMecllve barriers around raJutRHi facilities. particularly X-ray rtxwm. Prv'ftiKMi ((nail ihliuitiQ Itvffl X-ray tube, cyclo tron. taJium vt other radioactive material is primarily a quest** of shielding to reduce the level of taJiatio* lo a m(( ix specified amount. of maintaining safe disimsTi from irx rays, mJ u ui limiting the time of exposure. The prime coewJei aison in porot*r* pmctrati.xi of ray* is density of the shielding material l.c^J i* the Jfdtol at vt) omoHyii) available. W*V/e space is al a premium, parucutarl) in modern buikkoj*. trsj where utmoM taJiatioe protection n demanJedL bad h invari ably uwJ I eaJ n uvful, especially vhot aoiuotn and (unmt rays are cixscerneJ. m that it doe* not itself hcvivnc <onum<niird ia J emit harmful ray*. 1 cad. usually in sheet fxm. i* used lo line the walk, floor and ofua the ceiling *4 nvmt cunuinini radiation faoliix-L Opening* through the kittier for arr ductwwL, ppng. service boxes. cxwvJuit. etc,, require shield ing. usually obtained by a leaj barrier around or behind thoc Kiiklmg utilitio of vuftoem co'crape and thkkno\ to prevent penctratwxt td these rayv Deftewlaiaq SkMflwf Plwaaslan* Shielding of duct arvj other frnmp in the pnxective barrier <d radiation facilities depends on energy of radiation. oriental*** <rf the beam, dimension* and h'cat*x of operung in the protective barrier, geometrical rclaUoOship between the raJialica source and opening, and geometrical relationship letren opening and pet- iotn. materials <x instruments to be protected. The :*>- plcvity of the>e factor* require* the service* of a radio * Mr Goodman. formerly with Meyer. Strong and lone*, now ha* hit own cofttuhing practice in New York City, lie ha a mailer* degree in mcvhamcal engineering from the University of Witctxmo. where he specialized in beat trandcr. anj it licesixd prufrtuoaa! engineer. Mr. IK>lUnJt ii chief engineer, in charge of design of radiation hicld>ng material! and equipment, for BarRay Products. Il c .. Rn.x>llya, N. Y. He i* a nKmbcf of ASIM. Scxriety fex Nondeiiructive Tettmg. Acooui* cal SoCKty of America and American Involute of Phywca. logical phyvkiu. who determine* ettent of ahieldmg. material* for shielding Iu h u II> lead x Cexwtete) and the ihicknev* of the duel.bng material. After the radKdogical physio** ha ihxx the basK design for thu shielding, the protective barrier com/actor provide* the required shield ing fex the opening*. KJ *4 Isglatw IVuga of ductwork, piping, rtc^ should unrieipaar *ome of the pri>b4ema encountered both la the design and installation of shielding. Also, cvxxdmatitxi herwtva air csxvJ.tHXimg oxttracitx and shielding fabricator can best be achieved by ur*tSerstanJ:ng and fexethoughf M the part of the ait cooJd-umag designer. Fipors 1-4 gt*< some idea of the *'<* of ihie/Jm/ tcs|ured itiSitvJ ductwork. They show Va/uius due] insiaHaiit'nt wh^h penetrate the protective barrier fex walls or pjtittHxts of X ray rotxns. lead shielding b used to ciHff these penmgs. the rr/vciimr/r e*lcnt of which is indicated m terms < simple equatKXtt involving the opening d.mensMHis and wall thickness. These art riMixfi j/nr whivh will uj the air conditiew- ing de-ugner u> understand what 1j e\pect at to the area of shielded ductwork. The tadMihsgical physicist actually determines fix mi (ax the leuj /kwlneu and the naff a mow*/ of ykiflJtAt retiuired. N\>(e in Fig 4 that the protective shielding deals with pnmur.t radiaiitxt. while Tipurrs 1-1 show protectioB against uu/rered tx uvnnJary radiatiort. Primary radaatKm comes Jnri.il> fi.vn the source; scattered raJiatioB has been desiaicJ in Ju c .Imx s , and secondary raJutw* is emitted by an irradiated material. Primary raJiauoB reqiiirrs more protcviKKi because it* energy lod n higher. ftWlcaflti aad (itaflatlM Sheet lead is not structurally self-supporting, so must be mounted to promt sagging by it* os* weight. For lead thicknesses up 10 JJ mm. sheet lead can be readily shaped around round and small rectangular duets, say 24-inch maximum diameter or wiJih, with all joint* overlapped at lead t) inch lo hold these lead sheet* in place. I in\h wide iron kinJ* shoutJ be plaved around the pcr.|thct) of the duel on approximately 12-inch centers, care being taken rwe to cut into the lead when (be bands are bolted up. REFERENCE DATA--AIR CONDITIONING, HEATING AND VENTILATING February, 1963 Oitfributad by Lead Industrial Association, Inc., 292 Madison Avanua, Haw York 17. N. Y. frlots* l U.IJX wyjtf ;gx.r||jp,i 't.wmai'TCWPffjJJ N 1895.01 L IA23635 *TV.rW ar'a i. RADIATION PROTECTION AT WALL OPENINGS FOR DUCT OR PIPE \ FI*. 1. Pin vWw of tfoct runnk>( throojh pn/tHkwi of X-ri/ room, *pO*#4 to mo<>4) or ott*ro4 rodlotkwv REFERENCE DATA--AIR CONDITIONING. HEATING AND VENTILATING February, 1963 LIA23636' t JUS, RADIATION PROTECTION AT WALL OPENINGS FOR DUCT OR PIPE /. --r;.:.^rv:v ^ .( Heavy concrete floor < roof Slab. dens* enough /. * to acl tl sh*ek}>ng without lead hn.ng *,' \\*^l Dud Wt^iH high Register ^ lor ethausn / Lead shielding in X ray room wad or partition Duct op*nng, LW wd*H high Lead shielding on //dduuectwork it simitar // to that jhown on f'i i Scattered-^ or seconder radiation *ri T#ct 2H, whichever it greater Lead shielding ground free **vied vdes gf dwU Note W fir* dampen jr* required in duct penelr#*.ng thn partition or wait, 0* KCess door m the duct tor setting th* l X- fuVbif knk should b* loCJtfd irrvd* ' the X r*y room Lead shielding in X rry room wait or partition Fig. 2. Deration of section through X-ray room partition whar* dud opening H eipoted to secondary radiation. Primary radiation beam) Vw Ib4^ -lead baffle dimension: C3W- ?B) w*de by i3H . 2B: high., centered m front e* openr>g Note. Where dud runs str.ght without offset. Wad shielding s s*m*la/ to that shown on Fig 2 F*C- 4. Dan view cf dud running through partition o* X-ray room. eiposed to primary radiation. Fig. X. Dan view of radius albow in ductwork running through partition of X-ray room, siposad to secondary or scattered radiation. Note let duct rest on wcod sb*ps tor support Substantial trapere hangers should h- oued for supporting shielding enclosure Hanger rods rnust be ngtd enough to prevent any sway of the enclosure Fig. 5. Construction of laminated panef enclosure around shielded ductwork. REFERENCE DATA--AIR CONDITIONING. HEATING AND VENTILATING February, 1961 V-'" W8JL1. STT^*5 MP?W? peiw* k -XSwi fJA'f**wy,l.ynyi^>***|7Jl. - LIA23.&37 . artfa RADIATION PROTECTION AT WALL OPENINGS FOR DUCT OR PIPE When kad thivlnevv U piratet than ).5 mm i* Joel w>Jih ewreJ* N imho. kaJ vhieldmp ahoold he lami nated im a plywivd ** vnular drucluial CMC. whnh mJ< in wxtum t<r pinrlt to conform to the liJct of the duet TV laminated vection* are mechanically fastened at the wuin and corner*- 1 Wk >ont art lapped with vhed kad anpk* Y kaJ *tiip*. the width >f which n twice ihc thklncv* d the kad. Kk p4 k** than t> inch In any caw Nailv, bolt*. Htem or *<hcf faviener* uvrd to Wcwre the leaJ vhcd or panel muvt he cncJ with loJ id ihKlnr^t to lh< kaJ hc<l. Lead ui!) may tt wpJ M dw>* in Fif. J. fr k*J 0*<JJinj of l 0 mm or k. Ac%N< tradeJ vinyl heeiv van he u*J U* eav> forming to complet )a J conu'oo 1 hr ftcuHr leaded *uul vheel* can he applied m laev whete ki'n than I 0 mm kaj vhield.np ic requited. If the Jk 1 hav a druNf CuonrvtM>n ** ik made *4 a rtcvihk maietial. th< flevibk vinyl vheel* h< jppleJ over it more readily than odei ftrnu of dirU'iiy 'fnl pavvape tif the ra> at an) anpk. Thu kad patch method iv alvo tivcJ for ckelfK vwitch K>ir* kxaird In the wall. MadlcnJ Jai>*NHaa The eiieitt of the protective hatrver for medic*1 mh viilliihmt n Mimmul/nl Krk> to that the air (oednwa< my deupner can tell whether duct* or pipe* rormAf through n\h vpacet arc klrly to he a prihktn For mcJ:ca! ndropraphic and nvmi t*e kad shielding penctally ih'ev rwe cvtmJ aKwe a line 7 ft. 0 in. from the finwhrJ llr; and if the Venice Unc* and duct* can he kvated above ihiv line. chklJing around them it ohvnxrdy unneccvvary. For X-ray therapy ruorm. kaj dielJifty mi) nirnj ki the ceiling or itructurif vlah. Toe ceding nr vlah above and the fk* may alto he kaJ lined. depending upon utput ( the machine and other Cv*r>dit *>*. T ir inJuviriaJ X-ray B vhicldinf may ealcnJ to the veiling B*th ceikrtf and floor m amt cotv mil require k*d lining. IXd hanertv ate hevl irMilltJ m the outvote *<f the If>4 khifMmc ai that the hanpet |i\S or drape do M hate to ptut th< vhtekJ.np I he kaj vhieklutf adJa Coovidefahh to th? wc:pht if the J'k .1 an-J the hanpera 0>h iM he wihdanttal. with wh ade\)>ate irvh.*mt m the vlah aN't< as hvh platcv. I i>r intanpular docta, ttape/e hanperv tumid he the mnt pra%tiv'at. hor dev'^a ptrpM<-v. r-^^rnjtt cash i J* wxh *f kad al 4 !* per vq ft. Tevit for laJuiaHi kilape uc wvually made after (he tiom iv finivhed and the equipment tv mtUlkd. ft n vei) mifteWiant to mvtall ait vhieldiny pti'peflv dulint the oHitve of conuivKinxi hecauvc ot the open* in malinp urmtH<At to the finivhed pfutecti*e banief. Mmeovef. equipment mk H av dampetv vhoutd never he put m the ahiehkj vectKa of the J.Kltaork. av repair* to thu equipment wtMdd be vety amly if the *hickin( nuN he d*vmamkd. \ umpk ay to at**J pcitc(r*tte-o \<4 the pn^ective hailiet*v Wad kn.np h> pfvv in wirev >v U> ortvet them av clo* KhirvJ the kad l>nmp aa pnuhk k > that they can he h.wlrd with a kad ahert of vufhcK'M wre u> pte* Ftte vhieldinp in vupervtvltapc rtwtmv vpeoa) cun- diinme mat apply. In anv event, the radh'kvped phyv#- ,/vt vhH.ld he conaoftrJ to Jrwpn the pr*pe/ protevtam Uheie viootte it cnfl'-Oeied fiH the Otxldin* rnaterial. it : i'firn m*yc practiced U uve lead of equivalent value fe the vhicldiitf of c\v-te.,npv Where reccwet cvcur in coTKirte hartKi* lor fq 'ipment. havkiop. equitaletM to the ihKinov d the conctcle fcrtHned. aKtiild be provided liMktrapkf Of the many puMnatuwtv avaifahk i>e the vuhyed \4 radiatHtn pf*>4evlH>n. the* two are the mod wveful: 1. MeJnaJ X-tay Pr^rvtHMt ly *o 'nur Milbon Voftv ManJNti'V No. 7h, SatKtna'.J* can d Standard*. Hfcl; 2 KadiatMut Fut<\-tMtn, lead InJuvtrk* A%v*tctaiNj. Mavltvatfi A*cme, New York, N. Y. tn addiiMtn, the New York City Health Department pvihlivhev lh< New >'iwk City Health Cede requuement* Jcalmp with radn4<v|K,al haraida (ArtKk 175). iq > a i4 a n ^^ ( | lM n i j iMM REFERENCE DATA--AIR CONDITIONING. HEATING AND VENTILATING Fobnmy, 1963