著者

稲益 建夫 石西 伸 児玉 泰

出版者

The Japanese Society for Hygiene

雑誌

日本衛生学雑誌 (ISSN:00215082)

巻号頁・発行日

vol.33, no.3, pp.528-537, 1978-08-30 (Released:2009-02-17)

参考文献数

20

被引用文献数

2 3

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Health examination was carried out on subjects (2 males and 5 females) who used arsenic containing hot water from the geothermal power station in Kyushu, Japan. They used the hot water only to take a bath over 4 years. The arsenic concentration measured by the atomic absorption method after generating AsH3 was 3.53μg/ml in the hot water. Waste water from the bath drained into a brook at the backyard and arsenic concentration in the brook were 0.54, 0.03 and 0.01μg/ml at the points of 0, 200 and 600m from the outlet, respectively.A special health examination was carried out on the following items: 1) Physical examination by doctors (dermatologist and general physician) 2) blood examination 3) urine analysis 4) biochemical and enzymological serum examination by SMA-12 5) determination of arsenic in urine and hair.Arsenic concentration in urine measured 3 times per day for each subject ranged from 58 to 178μg/l and it was within normal range, Arsenic concentration in hair was higher than normal range: the highest was 5.2μg/g, and for 5 of 7 subjects it was over 1μg/g. The result was suspected to be responsible for exogenous contamination such as washing of hair by hot water containing arsenic. There were no particular findings related to the arsenic poisoning.It must be emphasized that special attention should be paid to prevent the environmental popllution and health hazard caused by the hot water from geothermal power stations.

著者

森重 敏子 石西 伸 長 哲二

出版者

日本衛生学会

雑誌

日本衛生学雑誌 (ISSN:00215082)

巻号頁・発行日

vol.32, no.3, pp.434-441, 1977-08-30 (Released:2009-02-17)

参考文献数

19

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The contamination and the pollution of foodstuffs by radioactive fallout have been investigated since 1961 in Fukuoka city and its suburban area. The results obtained were as follows.1) Recently, the degree of the contamination of greens by radioactive fallout which fell on the leaves decreased to one thousandth in the early stage of the investigation (1961-1962). In the period of the investigation, the remarkable increase of the radioactivity of fallout was observed within a week after the Chinese nuclear bomb explosion in the atmosphere (1st, 2nd, 5th, 12th, 13th, and 15th). The radioactivity was 2 to 300 times higher than the usual level.2) The radioactivity was not remarkable in vegetables which were washed with soap, but it decreased gradually year by year. The increase of the radioactivity was also observed a few days after the atmospheric nuclear explosion.3) In milk, there were no remarkable yearly decreases of the radioactivity from the beginning of the investigation, but the seasonal variations of the radioactivity, such as higher in April and May, were observed.4) The radioactivity in diets based on the standard food production in Japan was the highest in 1967. It decreased gradually from 1967 to 1971 and after that the remarkable variation of the activity was not observed.5) 137Cs contamination of foodstuffs has been observed quantitatively by the method of gamma spectrometry, while sometimes 95Zr-95Nb, 103Ru, and 131I were also detected from the specimens obtained immediately after the nuclear explosions.

著者

国武 栄三郎 石西 伸 児玉 泰

出版者

The Japanese Society for Hygiene

雑誌

日本衛生学雑誌 (ISSN:00215082)

巻号頁・発行日

vol.30, no.3, pp.417-429, 1975-08-28 (Released:2009-04-21)

参考文献数

24

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Studies of mental fatigue caused by exposure to the aircraft noise was carried out experimentally on 9 female students engaged in some intellectual performance. The tape-recorded noise of the flying Jet engine was controlled from 85dB(A) to 95dB(A) in the peak level. The subjects were exposed continuously to the noise during 50 minutes and 100 minutes, respectively, in an insulated room protected from general outer noise.Through the noise exposure period, the subjects performed intellectual tasks, that is, the Kraepelin- Uchida's test and card-sorting test. At the same time, pulse rates and pulse waves of their fingertips were measured. Before and after each exposure, the mental fatigue was measured by the critical fusion frequency (C.F.F.), the color naming test (C.N.) and the discriminative reaction of the multiple performance test (M.P.). And the information of subjective sensations of human fatigue were collected by the questionnaire, Cornal Medical Index (C.M.I.) were used for psychophysiological complaints. The control data of each subject were obtained by the same experiment except noise.The following conculusions were derived from observations. The grade of mental fatigue increased in the case of the noise exposure rather than in the case of the noiseless situation. In C.F.F., fatigue increased 13% under noise exposure of 50 minutes, 37% under that of 100 minutes. In C.N. and M.P. as wel as C.F.F. the same gradiance between the noise exposure and fatigue were found. Furthermore, fatigue revealed itself more clearly in C.N. than in C.F.F., namely, the rate of prolongation of the time required for color identifying exceeded the critical level of mental fatigue, while the rate of mental fatigue in C.F.F. was within the normal or allowable range.The results of the questionnaire of subjective sensations of fatigue and of the C.M.I. in the case of the noise exposure showed no remarkable differences compared with those of the noiseless situation. But, it was found that some complaints of sensations of fatigue increased slightly during noise exposure compared with those in the noiseless situation. These complaints were the symptoms probably caused by the sympagotonic hypertension. Moreover, from the observation of the pulse rates and pulse waves, it was recognized that a biological lags of the relaxation of the sympathetic nerves system might occur when they were released from the intellectual tasks.From the observation mentioned above, it is considered that there is a posibility of the inhibition of the learning effectiveness in school children when they are exposed to the aircraft noise such as the subjects were exposed to in this experiment. The exposed aircraft noise level used in this study, calculated from the peak levels and flying numbers, corresponds to 80 W.E.C.P.N.L.. It can be said that mental fatigue is induced markedly by the noise of 80 W.E.C.P.N.L.. It is suggested that the noise level of 80 W.E.C.P.N.L. is not harmless to human being in the case of intellectual performance, especially during school hours.

著者

大山 司郎 山本 昭代 久永 明 平田 美由紀 稲益 建夫 石西 伸

出版者

公益社団法人日本産業衛生学会

雑誌

産業医学 (ISSN:00471879)

巻号頁・発行日

vol.29, no.7, 1987-12-20