<s>
A	O
transition	B-Algorithm
radiation	I-Algorithm
detector	I-Algorithm
(	O
TRD	O
)	O
is	O
a	O
particle	B-Algorithm
detector	I-Algorithm
using	O
the	O
-dependent	O
threshold	O
of	O
transition	O
radiation	O
in	O
a	O
stratified	O
material	O
.	O
</s>
<s>
Thus	O
particles	O
with	O
large	O
give	O
off	O
many	O
photons	B-Application
,	O
and	O
small	O
give	O
off	O
few	O
.	O
</s>
<s>
The	O
radiated	O
photon	B-Application
gives	O
energy	O
deposition	O
by	O
photoelectric	O
effect	O
,	O
and	O
the	O
signal	O
is	O
detected	O
as	O
ionization	O
.	O
</s>
<s>
Usually	O
materials	O
with	O
low	O
are	O
preferred	O
(	O
,	O
)	O
for	O
the	O
radiator	O
,	O
while	O
for	O
photons	B-Application
materials	O
with	O
high	O
are	O
used	O
to	O
get	O
a	O
high	O
cross	O
section	O
for	O
photoelectric	O
effect	O
(	O
ex	O
.	O
</s>
