KellyClarksonTV (or somebody else of the same name) wrote thusly in message
<[Only registered users see links. ].cs.com>:
It is an intermediate decay product of americium-241 which is the primary
isotope used in the smoke detectors. Since the amount of americium is
miniscule, and it has a half-life of 500 years or so, the amount of U-233
present over a reasonable timescale would be impossibly small.
Yes it is usable as nuclear fuel, as are most odd-numbered isotopes in that
region. It's just that it's difficult to amass enough of it from smoke
detectors. Better to use the americium directly, reduces the number of
smoke detectors required from the trillions to the millions.
Pair them off into threes