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KMID : 0351619690100010111
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Kyungpook Medical Journal
1969 Volume.10 No. 1 p.111 ~ p.126
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The Study on The Amount of Ultraviolet Ray and Its Germicidal Action in Taegu Area
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Abstract
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The germicidal action of sunlight has been studied by Robert Koch, and the actions of ultraviolet (LTV) ray in sunlight has been proved by Eidinow. It is known that the doses of UV ray in sunlight are different by months, seasons, latitude and weather, and also different each time in a day.
The author observed variations of amount of UV ray by each hours from 9 a. m. to 3 p. m. in a day and also observed amount of L´V ray in sunlight at noon, three times in a month (1st, 2nd and 3rd decade of each month) in Taegu area. The correlation of germicdal action of sunlight to BCG and tubercle bacilli in sputum were observed.
The results observed are as follows:
1. The largest amount of UV ray in sunlight is in June (5 ergs/cm~/min. at noon). January and December are one seventh of June, and February and November are one fourth of June.
2. The amounts of UV ray in cirrus day are about 50 o of fine clear day.
3. The required exposure time for complete germicidal action of direct sunlight to BCG are 6 minutes in l~1ay, June and July, 8 minutes in
March, April, August and September, and 10 minut~;s in October and November, and in general more intensive after June than before June throughout a year.
4. The germicidal action of UV ray to BCG in scattered sunlight is relatively weaker than direct sunlight. Ten to fourty percent of them are survived to the exposure of 180 minutes from September to April, but contraly most of them are dead from May to August.
5. The germicidal effect of direct sunlight from September to April is weak to tubercle bacilli in sputum even at the exposure of 150 minutes, but almost of them are dead from Mav to August at the same duration of exposure.
6. Even after the exposure of 7 hours to tubercle bacilli of sputum in scattered sunlight from IV[ay to August are not killed completely.
7. Tlie correlation coefficient between the amcu;at of UV ray and the number of dead BCG or tubercle bacilli in sputum are 0.95 or 0.75 respectively.
8. The correlation ratio between the amount of UV r:~y and the number of dead BCG in each hour is 0.88.
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