<s>
A	O
solid-state	B-Algorithm
nuclear	I-Algorithm
track	I-Algorithm
detector	I-Algorithm
or	O
SSNTD	B-Algorithm
(	O
also	O
known	O
as	O
an	O
etched	O
track	O
detector	O
or	O
a	O
dielectric	O
track	O
detector	O
,	O
DTD	O
)	O
is	O
a	O
sample	O
of	O
a	O
solid	O
material	O
(	O
photographic	O
emulsion	O
,	O
crystal	O
,	O
glass	O
or	O
plastic	O
)	O
exposed	O
to	O
nuclear	O
radiation	O
(	O
neutrons	O
or	O
charged	O
particles	O
,	O
occasionally	O
also	O
gamma	O
rays	O
)	O
,	O
etched	O
,	O
and	O
examined	O
microscopically	O
.	O
</s>
<s>
The	O
basis	O
of	O
SSNTDs	B-Algorithm
is	O
that	O
charged	O
particles	O
damage	O
the	O
detector	O
within	O
nanometers	O
along	O
the	O
track	O
in	O
such	O
a	O
way	O
that	O
the	O
track	O
can	O
be	O
etched	O
many	O
times	O
faster	O
than	O
the	O
undamaged	O
material	O
.	O
</s>
<s>
SSNTDs	B-Algorithm
are	O
commonly	O
used	O
to	O
study	O
cosmic	O
rays	O
,	O
long-lived	O
radioactive	O
elements	O
,	O
radon	O
concentration	O
in	O
houses	O
,	O
and	O
the	O
age	O
of	O
geological	O
samples	O
.	O
</s>
<s>
A	O
material	O
commonly	O
used	O
in	O
SSNTDs	B-Algorithm
is	O
polyallyl	O
diglycol	O
carbonate	O
(	O
PADC	O
)	O
,	O
also	O
known	O
as	O
Tastrak	O
,	O
CR-39	O
and	O
CR39	O
.	O
</s>
