1959 年 14 巻 4 号 p. 225-230
X-ray apparatus is generally operated from control panel with the various measurements. None of them, however, is completely accurate and the peculiarities of each apparatus cause an error when the voltage is changed. Therefore, the author measured radiant energy directly with a pocket chamber ; when compared with the results of indirect measuring, the difference was difinite ahd this direct method gave a more accurate count of radiant energy.