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>Subject: Re: Use of Lead sheets as Primary Barriers in Radiotherapy
Bunkers
>>Use:
>>a=(B-A)(Tl/(Tc-Tl))
>>where: a = Thickness of lead embedded in the concrete
>>A = Final desired thickness of the barrier, concrete plus lead
>>B = Total barrier thickness in concrete with NO lead
>>Tl = TVL of lead
>>Tc = TVL concrete
>>Keep the lead close to the source of neutrons. Building code will not
>>allow inserts to be within 2" of the concrete surface. Allow for rebars
>>and then place the lead, so that the majority of the concrete is
>>towards the occupied spaces outside of the room.
>>Good luck.
>>
>>--
>>Darrell O. Poole
>>M.D. Anderson Cancer Center Orlando
>>407.628.0991
>>407.628.8463 FAX
>>dopoole@ieee.org
>>
>> *********** ************
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