Арктика

исходные для более детальной р а з р а б о т к и метода приме­нительно к различной аппаратуре и д л я различных условий в буровых скважинах. ЛИТЕРАТУРА 1. К и ρ и к о в А. П., Т в е р с к о й П. И. и др. — Радиоактивные гео­физические методы в применении к геологии", Л., 1934. 2. Г о р ш к о в Г. В. — О влиянии вторичных лучей при измерениях активности радиоактивных веществ. Труды Гос. Радиевого ин-та. (В печати.) 3. Г о р ш к о в Г. В. и Л я т к о в с к а я Н . М. — К вопросу [об изме­рениях интенсивности излучения горных пород, закрытых наносами. Журнал геофизики, том IV, выпуск I , стр. 71, 1934. A N ATTEMPT Т О CHARACTERIZE T H E GEOLOGICAL STRUCTURE BY T H E INTENSITY OF γ-RADIATION IN BOREHOLES By О. V. GORSHKOV and L . M. KURBATOV In connection with the development of boring-work in Nord-vic Bay arose the question of the necessity of geophysical in­vestigations, which would throw light on the geological struc­ture of the boreholes. However, the electrocarotage (Sc h l u m ­b e r g e r method) — which, as is well known, has been widely used for the past few years, chiefly in oil-fields — being unsui­table in the conditions of permanent congelation, as well as in strong salinity of the strata and the presence qf casings, the desirability of using a method, free from such restrictions, be­came evident. In view of this the Radiometrical laboratory of the Arctic Institute carried out experimental work in order to elucidate the possibility of determining the geological structure of the boreholes by means of the γ-method. This method which has received comparatively wide appli­cation in prospecting deposits of radioactive minerals is, as we know, of little effect under ordinary conditions, as alluvials from 1 m thick absorb γ-rays almost completely. But in applying γ-measurements in boreholes we have the most favourable conditions possible for such measurements as, firstly, there are no alluvials to absorb the γ-rays, and, secon-29