<s>
Radiopharmaceuticals	B-Algorithm
,	O
or	O
medicinal	B-Algorithm
radiocompounds	I-Algorithm
,	O
are	O
a	O
group	O
of	O
pharmaceutical	O
drugs	O
containing	O
radioactive	O
isotopes	O
.	O
</s>
<s>
Radiopharmaceuticals	B-Algorithm
can	O
be	O
used	O
as	O
diagnostic	O
and	O
therapeutic	O
agents	O
.	O
</s>
<s>
Radiopharmaceuticals	B-Algorithm
emit	O
radiation	O
themselves	O
,	O
which	O
is	O
different	O
from	O
contrast	B-Algorithm
media	I-Algorithm
which	O
absorb	O
or	O
alter	O
external	O
electromagnetism	O
or	O
ultrasound	O
.	O
</s>
<s>
While	O
not	O
all	O
medical	O
isotopes	O
are	O
radioactive	O
,	O
radiopharmaceuticals	B-Algorithm
are	O
the	O
oldest	O
and	O
still	O
most	O
common	O
such	O
drugs	O
.	O
</s>
<s>
As	O
with	O
other	O
pharmaceutical	O
drugs	O
,	O
there	O
is	O
standardization	O
of	O
the	O
drug	O
nomenclature	O
for	O
radiopharmaceuticals	B-Algorithm
,	O
although	O
various	O
standards	O
coexist	O
.	O
</s>
<s>
The	O
details	O
are	O
explained	O
at	O
Radiopharmacology	O
§	O
Drug	O
nomenclature	O
for	O
radiopharmaceuticals	B-Algorithm
.	O
</s>
<s>
A	O
list	O
of	O
nuclear	O
medicine	O
radiopharmaceuticals	B-Algorithm
follows	O
.	O
</s>
<s>
There	O
is	O
a	O
section	O
for	O
each	O
radioisotope	O
with	O
a	O
table	O
of	O
radiopharmaceuticals	B-Algorithm
using	O
that	O
radioisotope	O
.	O
</s>
<s>
18F	O
is	O
a	O
positron	O
emitter	O
with	O
a	O
half-life	B-Application
of	O
109	O
minutes	O
.	O
</s>
<s>
See	O
PET	B-Application
scan	I-Application
.	O
</s>
<s>
68Ga	O
is	O
a	O
positron	O
emitter	O
,	O
with	O
a	O
68-minute	O
half-life	B-Application
,	O
produced	O
by	O
elution	O
from	O
germanium-68	O
in	O
a	O
gallium-68	O
generator	O
or	O
by	O
proton	O
irradiation	O
of	O
zinc-68	O
.	O
</s>
<s>
See	O
also	O
positron	B-Application
emission	I-Application
tomography	I-Application
.	O
</s>
<s>
3H	O
or	O
tritium	B-Language
is	O
a	O
beta	O
emitter	O
.	O
</s>
<s>
125I	O
is	O
a	O
gamma	O
emitter	O
with	O
a	O
long	O
half-life	B-Application
of	O
59.4	O
days	O
(	O
the	O
longest	O
of	O
all	O
radioiodines	O
used	O
in	O
medicine	O
)	O
.	O
</s>
<s>
Iodine-123	O
is	O
preferred	O
for	O
imaging	O
,	O
so	O
I-125	O
is	O
used	O
diagnostically	O
only	O
when	O
the	O
test	O
requires	O
a	O
longer	O
period	O
to	O
prepare	O
the	O
radiopharmaceutical	B-Algorithm
and	O
trace	O
it	O
,	O
such	O
as	O
a	O
fibrinogen	O
scan	O
to	O
diagnose	O
clotting	O
.	O
</s>
<s>
Technetium-99m	O
is	O
a	O
gamma	O
emitter	O
.	O
</s>
<s>
It	O
is	O
obtained	O
on-site	O
at	O
the	O
imaging	O
center	O
as	O
the	O
soluble	O
pertechnetate	O
which	O
is	O
eluted	O
from	O
a	O
technetium-99m	O
generator	O
,	O
and	O
then	O
either	O
used	O
directly	O
as	O
this	O
soluble	O
salt	O
,	O
or	O
else	O
used	O
to	O
synthesize	O
a	O
number	O
of	O
technetium-99m-based	O
radiopharmaceuticals	B-Algorithm
.	O
</s>
