A similar theory had earlier been proposed for comets.
The scientists noted this early radiogenic heating on Enceladus raises the possibility of life on that moon.
Notice that a similar theory had already been proposed to explain aqueous minerals seen in meteorites believed to stem from comets:
exoscientist
01/14/06 04:52 PM
Re: Enceladus, the Europa of Saturn
http://uplink.space.com/showthreaded.php?Cat=&Board=sciastro&Number=426379
exoscientist
08/09/06 10:17 AM
"The elephant in the room."
http://uplink.space.com/showthreaded.php?Cat=&Board=sciastro&Number=550963
Bob Clark