HomeMy WebLinkAboutPermit Correspondence 2008-3-19
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Integrated X-ray
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COR\X!IN
~-IEALm PHYSICS INC
Quality Medical Hllollh Physics in lhe Pacific Norrhwesr
Radiation Shielding Design
For
Pioneer Pacific College (Eugene Campus)
3800 Sports Way
Springfield, OR 97477
X-Ray Room
January 17th, 2008 4-A",,~
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www.corwinhp.com
Jercmy@corwinhp.com
Phone: (360) 731i-6066
Fax: (360) 716-6066
MAR-19-20B8 01:02 FROM: INTEGRATED X-RAY
TO: 1541653Bll79
sro 626 7732
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Radiatiuo Shieldiog D""ign
Pioneer Pacific College (Eugene Com pus)
3800 Sports Way
Sprinefleld. OR 97477
Jnnu..y 1"h, 2008
Shielding Design Summary
Shidding calculations were perfonned for Ihe new X-ray system that will be installed at
Pioneer Pacific College Eugene Campus in Springfield, Oregon.
A summary chan of the required lead shielding is al enclosure I, A scale drawing of the
room is 01 enclosure 2. The lollowing is a detailed explanation of the shielding required
on eoch wall.
Summo,." or Reoulred ShicldinR.
The following lead shielding is the minimum amount of Icad required to reduce radiation
exposures to below the current regulatory limits. Installation of lend thickness greater
than those specified below is acceptable. Unless noted, all lead must extend from the
floor to 0 height of seven teet ~
Chest receptor/Janitor (Wall A). The Chest Receptor Wall requires 0,79 mOl lead
shielding. The 0.79 mm lead shielding must extend over to the hallway door. The door
does not require any lead shielding.
Hallway (WolIB). As stated above. the 0.79 mOl lead from the chest bucky waif must
extend over to the door. The door docs not require any lead shielding,
Class Room (Waif C). The Closs Room Walls require 0.79 mOl lead shielding.
Control Booth (Wan D). The amount of lead required lor the control booth wall is 0.79
mOl. 0.79 mOl leod equivaleoce is required in the viewing window. The Class Room wall
di~ctly behind the control booth does not require shieldinG since it is in line of the
shielded control booth wall.-Please note that the x-ray exposure switch must be mounted
in such a manner that it is impossible for an operator to make exposures from an
unprotected area. This can be accomplished by placing the switch at a pc;nnancnl
POsilion atleBSt 36 inches from the edge of the control booth. Also, there must be at least
7.5 square feel of unobstructed floor space in the Control Booth area.
CIa"" Room (Wall E). The Class Room Wall requires 0,79 mOl lead shielding in the area
not directly covered by the Control Booth wan.
Dark Room (Wall F). The Dark Room Wan and Door require 0.79 mOl lead shielding.
Also, it is recommended a I.SS mOl leaded tilm storage box be used for all film slorage.
CORWIN HEAL "H PHYSICS INC
P.3/8
MAR-19-20B8 01:02 FROM:INTEGRATED X-RAY
503 626 7732
TO: 15416538078
, ,.
Radiation Shielding Design
Pioneer Pacific College (Eugene Campus)
3800 Sports Way
Springfield, OR 97477
January 17".2008
Exterior (Wan G), The exterior Wall docs not require any lead shielding.
Floor. The existing 4 inch (10.1 em) concrete floor is suflieient shielding, No additional
lead shielding is required on the floor.
Ceiling. The eltisting 4 inch (10.1 em) concrelll ceiling is sufficient shielding. Nn
additionalleed shielding is required on the ceiling.
Method. and Assumptions
The above shielding recommendations were based on the tallowing infonna!ion:
The proposed It-ray system is a radiographic system with a table and chest image
receptor. The facility will use tilm and screens,
The maximum weekly exposure rates for controlled areas are O. J 0 mGy/week and lor
uncontrolled areas is 0,02 mGy/week. The maximum allowed exposure rate for film
storage and imaging plates is 0.025 mGy/week.
The estimated workload oC approltimately 25 tilms per month was provided by the
clinic. The design was completed with a workload of 25 patients per week, which
translates to 62.5 mA-minlweek on the table and 15 mA-minlweek at the chest
reeeptor.
The oceupum:y of eoch room is noted on the enclosed detailed summary sheet and
diagram. There is no oc.:upam:y above or below the x-ray room.
The primary reference for these shielding calculations is NCRP Repon 147,
Slnlctural ShieldinS Design for Medical X-Ray Imaging Facilities,
Please nole the Ibllowin~;
These recommendations are based on the workload and oceupancy of rooms provided
at the time of these shielding design calculations. If changes occur in the occupancy
of the rooms next to this It-ray mom, if the type of x-ray system Is changed. or iflh.
workload increases, additional shielding may b. required.
Please keep a copy of this shielding plan at your facility indefinitely.
Please note that an anode-up orientation ,oflbe x-ray tube is oprimal, but not required,
for wall bucky configurations.
CORWIN HI!ALTH PHYSICS INC
P.4/B
MAR-19-20B8 01:02 FRQM:IHTEGRATED X-RAY
503 626 7732
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Radiation Shielding Uesign
PloneerPadflc College (Eullene Campus)
3800 Sporrs Way
Springfield, OR 97477
TO: 15416538078
January 17'.. 2008
Thanle-you for allowing me to perronn your shielding calculations. If you have any
que.tions. please call me at (360) 73
ft-
JE MY L. CORWIN. CHI'
Medical Physicist
CORWIN HUI,TH PHYSICS INC
Enclosures:
Shielding Summary
Diagram of Room
Schedule of Commercial Lead
CORWIN HMLTH PHYSICS INC
P.5'B
MAR-19-20BB 01:03 FROM: INTEGRATED X-RAY
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J.ll Shie1<l1J>1 J)8eip E)"meot.
l!.S.l 11lb!rior WrdU :"
. LoeaI buildinlt 8lld 6re codu, as wella. .tatahulth.c.....lic.".-
ing ~e:nci.... lpeci!Y nq,uit_ts'!or,.,.!l ...eJUhlico that tneet
U".w..mtet5 . Laboratories. .:!no. .~ CDr Ii!c lafelY.
Ul1lIhJ.o)dcd wellJ In ocmtoemp0nr7 health.._ beiliu.. "'0 nQr'
maUy ~wci otmet:al.tudO an4 eae Qr =0 lay,," c!:!I8 inch.
thick drywall (mSllm 'wallboud.) per &ld4. The cxn:ridcr old.. of
....u. ma, ~ two .I&yero of ml\Un W"allbc~, s.vuaJ typu
of .hjcl~ mat.oriaJ.I aft avallahle &lr walls. I . . ,
2.8,1,1 $hHt Lood, Sheet Led hu tnditiol)aUlr beea the material
a( clwieo for shieldillg nWtical L.Illlging ...-Uf roOIl> wal.l.!. Fi~ 2.3
ahowI the ~_ of .heellead (in millil:>4W:t1 ....d incl>M) and
tho... ,,"~;n'.1 w.iPts (in lb foe>') round t. be coJ...m=ially .,ail.
,abl.!rom a I~ c!s..n..l major l"I'pIiUO j,; the UnJudState.1
All oJ th....; t:hil:kl:leSau lIIay "'" be availabLe In ...-y .,..a;
F\gu<e 2.3 oloo ~ w.. ..Wive colt per ~t (eo avenll") lbr
ooch thIckn.... __pan<! "" tl>.o alOt per'ahtC>t' fD. the 0,79 nun
t1Uc:bo<., N'"", that the weith,lrl poundJ pU .quaze (oct is oq~.
to the n''-''lyual Tl'4...lt-"..~. io ihclle:I multiplied. by N. For uunple.
1/18 inch loAd.1s cquivalolU'to 4 III (ocr-'. .. !
iar ~ .~l"''''r apPlicatiotl$. . laael ~ lI,gluad to ·
,th.\e, ef llYJ'Clllll ~b6al'd alld wWlad le.d inWard \rith nailJ or
acrew. on ....codtn er _w otud.t. Xr"ylmA~ of wall AOgmanu-
.how W; icaea'ti= aCthe lWlJ.ar icnws dees not rvsult in !icnif-
...mt rad!ati....lcakt.' In wr, rU~1 'lloUs or oaeW' etMani' '
&l:t<I!Nata nldiiuioD equally, or more eIfei:'livtl1.Jthan the lead dls-.. .,
pJaoe<i l>y the ,o..tlIL Tboee!oro. .tMJ naiII or .orow. taM te ~
Iud burlsn Ilwcl pot be ",Ymid wilh lead daiS or .upplementary
l..d. 11............, YlMJoa th. ed..ilH eftwo. iead Shoo m&ol:. tho! OOl1ti.
"w'Yofabiddilli: a!ulU be.....urN ~ the Joints '(SettioIl2.4.21 0 ...
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l.3.1's (}ypnun WGUbo<ud. Gyp.um wal\l>o&rd (ah..aocl<) i. com~
monly ,UM4 !IiI wall ""Mruc<l- b> _d1C*1 tadJltlu, A.; Glue
t< or. 0.979) pciowci cut, the == in uch IbMt IIlUldwiched
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