radiothorium
Definition of radiothorium
ra`di`o`tho´ri`um
Pronunciation:
rā`dĭ`ǒ`thôr´ē`ŭm
n.
1.
(Chem.)
an
earlier
name
for
the
thorium
isotope
thorium-228
,
given
by
its
discoverer
Otto
Hahn
.
It
is
a
radioactive
substance
formed
as
one
of
series
of
products
in
the
chain
of
radioactive
decay
of
thorium
.
Its
immediate
predecessor
in
the
chain
is
Actinium-228
,
and
it
decays
by
alpha
emission
to
radium-224
with
a
half-life
of
1
.91
years
.
The
name
radiothorium
was
given
prior
to
the
full
understanding
of
the
nature
of
isotopes
of
elements
.
Related Words
atomic
number
90,
Th
,
thorium
,
thorium-228
Word:
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