FW: Photoneutron production/transmission through Pb/concrete barriers for medical linear acclerators.

["Eric Cowdrey" <ericc@cancercare.mb.ca>]

In response to the question originally raised by Carmen Conte, my colleague
Jeff Sandeman has
recommended that a 1992 Health Physics paper by Dr. Patton H McGinley be
consulted.

**************************************************************

Eric Cowdrey, M.Sc. (Physics)
Radiation Protection Officer
Department of Medical Physics
CancerCare Manitoba
100 Olivia Street
Winnipeg, Manitoba    R3E 0V9
CANADA

Tel (204) 787-2166
Fax (204) 775-1684
e-mail ericc@cancercare.mb.ca

Industrial hygiene in Manitoba: http://aiha.cancercare.mb.ca


-----Original Message-----
From: Jeff Sandeman [mailto:jeff.sandeman@cancercare.mb.ca]
Sent: Friday, April 07, 2000 4:03 PM
To: eric.cowdrey@cancercare.mb.ca
Subject: Photoneutron production/transmission through Pb/concrete
barriers for medical linear acclerators.


For a concise and comprehensive evaluation of the use of heavy
metal/concrete sandwich shielding for medical linear accelerators, I highly
recommend the following paper:

"Photoneutron production in the Primary Barriers of Medical Accelerator
Rooms" by Patton H. McGinley, Health Physics, April 1992, Vol 62, Number 4,
pages 359-362.

Original question:

Hello,

Does anybody know of any problem in having a 18MV accelerator for
radiotherapy treatments in a bunker (shielded room) whose walls are
made of lead + concrete?. That is, neutrons get first to the lead shield
and then to the concrete, and not the other way round, which is most
common among shielded bunker doors (in fact neutrons and fotons get
first to a paraffin layer and then to the lead).

Thanks in advance.

Carmen Conte
cconte@correu.gencat.es

************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html