The temperature dependence of the Ag-109 gamma-ray self-absorption was
investigated for the horizontal and vertical directions of emission.
The source was a single-crystal silver plate containing atoms of paren
t radionuclide Cd-109. Gamma-radiation of this gamma-source and that o
f the monitoring gamma-source, Co-57, were registered by a pair of Ge(
Li)-detectors. As a result of cooling the source from 77 K to similar
to 12 K a relative decrease was observed of the intensity of the horiz
ontally emitted gamma-rays equal to 0.00064 +/- 0.00044. For the verti
cal direction the corresponding intensity change turned out to be -0.0
0047 +/- 0.00051. Although these data, as one would see, give some evi
dence for the possible effect of the gravitation on the resonant gamma
-ray absorption, future measurements must show if these results aren't
a consequence of any apparatus effect. The ways for developments in t
his study are discussed and some hindrances are considered.