In this TEDx event:
<http://www.youtube.com/watch?feature=player_detailpage&v=eGmgTo2Kw1U#t=564s>
Focardi says, that no neutrons where observed.
Gamma radiation /not much above ambient level/ was observed.
So it seems they added the lead shield only for security, but not for
protection and thermalization.
This conflicts with Rossis statement that gamma radiation is thermalized
in the lead shield.
Gamma rays not much above ambient level cannot contribute a measurable
amount of thermal energy.
Peter
