<s>
UrQMD	B-Application
(	O
Ultra	O
relativistic	O
Quantum	O
Molecular	O
Dynamics	O
)	O
is	O
a	O
fully	O
integrated	O
Monte	B-Algorithm
Carlo	I-Algorithm
simulation	I-Algorithm
package	O
for	O
Proton+Proton	O
,	O
Proton+nucleus	O
and	O
nucleus+nucleus	O
interactions	O
.	O
</s>
<s>
UrQMD	B-Application
has	O
many	O
applications	O
in	O
particle	O
physics	O
,	O
high	O
energy	O
experimental	O
physics	O
and	O
engineering	O
,	O
shielding	O
,	O
detector	B-Application
design	O
,	O
cosmic	O
ray	O
studies	O
,	O
and	O
medical	O
physics	O
.	O
</s>
<s>
UrQMD	B-Application
is	O
available	O
in	O
as	O
open-source	B-Application
Fortran	B-Application
code	O
.	O
</s>
<s>
UrQMD	B-Application
is	O
developed	O
using	O
the	O
FORTRAN	B-Application
language	I-Application
.	O
</s>
<s>
Under	O
Linux	B-Application
the	O
gfortran	B-Application
compiler	O
is	O
necessary	O
to	O
build	O
and	O
run	O
the	O
program	O
.	O
</s>
<s>
The	O
UrQMD	B-Application
model	O
is	O
part	O
of	O
the	O
GEANT4	B-Application
simulation	O
package	O
and	O
can	O
be	O
used	O
as	O
a	O
low-energy	O
hadronic	O
interaction	O
model	O
within	O
the	O
air	O
shower	O
simulation	O
code	O
CORSIKA	B-Application
.	O
</s>
