LOL, THE SKY IS FALLING, the radiation at Lucas Heights is the last thing you need to worry about, your phone does more damage, also where do you think the medical radio active stuff is made, cancer treatment, X Ray stuff.
End rant.
Newcastle would be good for a full sized track but Lucas Heights would be perfect for a driver training come skid pan area, I think it would get a huge amount of people who don't want to drive for hours (Marulan) or wait for a event at E/C.
Also I don't know what area they want to use but there is some good areas around there that you could make a nice hill climb section, bring it on I say, I'll go.