It is shown that "photon+Jet" events, being collected at LHC, would provide
us with the data sufficient for an extraction of gluon distribution function in
a proton using valence and s quark distributions measured in the same
experiment with another physical proces A new region of 10^{-4}< x < 10^{-1}
with 1.6x10^3 photon
+Jet events are also given.Comment: 9 pages, 1 figure, modified cernrep.cls fil