ラジオアクティブ・スノウゲージ実用化の研究(第1報)

抄録

A practical radioactive snow gauge of a new design with a telemetering system has been made. The principle of measurement is based upon the mass absorption of the gamma rays by deposited snow. The gamma rays are emitted from artificial radio-isotope Co⁶⁰ suspended at a suitable height above the ground. The counting rate of pulses by a G-M counter, which is specially prepared ethyl formate quenched one, buried just under the ground surface indi-cates the water equivalent of snow deposited over that spot. The output current of the rate-meter converted from the pulse is used to operate the Morse code system of a radio trans-mitter. This enables very accurate remote of snowfall in isolated mountain areas. General arrangement of the telemetering system of the gauge is shown in a figure.
Preliminary tests of the system in Sapporo were sufficiently successful. The new gauge with necessary improvements will be set at a suitable point in the Lake Shikaribetsu basin for practical use in ascertaining the volume of water which will become available to the Shikaribetsu hydroelectric plants.