Neutron transmission through boronated concrete

[Janette Atkinson <janette@MTP.PD.UWA.EDU.AU>]

Dear Radsafers,



Re: Neutron transmission through boronated concrete



We have embarked on the planning and the installation of a 19 MeV H-

unshielded cyclotron for the production of PET radioisotopes. The

cyclotron is to be situated in the basement corner of our Hospital, with



dirt on two sides.

Based on available data, the neutron fluence at 1m from the target is

estimated to be 3.0E7. Initial shielding estimates (based on methods of

NCRP 51 + manufacturer data) indicate a concrete thickness (using the

TSF 5.5 specifications) of some 1.7 m. To maximise the amount of

available space in our bunker, we would like to reduce the shielding

thickness. There have been some suggestions that boronated concrete will



increase the attenuation of TSF 5.5 concrete, however we have not been

able to find Dose-equivalent index transmission data through boronated

concrete.

Anyone with data or sources of information on neutron transmission

through boronated concrete please reply directly to:



thomast@mtp.pd.uwa.edu.au





Thomas Tuchyna,  M.Sc.

_________________________

Senior Radiation Physicist

Sir Charles Gairdner Hospital

Department of Medical Technology and Physics

Queen Elizabeth II Medical Centre

NEDLANDS

PERTH  WA  6009



facsimile: 08 9346 3466  international: 011 61 8 9346 3466

telephone: 08 9346 4277  international: 011 61 8 9346 4277

















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