鑛泉中のRadium Emanation含有量の測定に就いて

抄録

This is a short report of the measurement of radium emanation in a spring at “Sugi-no-midu”, Tukuba. The apparatus used is an ordinary electrometer with ionisation chamber, made in the manufactory of the Central Meteorological Observatory.
It is known from the results obtained that the amount of the radium emanation in this spring varies with the air-pressure.