. Biological effects of radiation; mechanism and measurement of radiation, applications in biology, photochemical reactions, effects of radiant energy on organisms and organic products. Radiation; Biology. VISIBLE AND NEAR-VISIBLE RADIATION 175 Forsythe and Christison (28), Fig. 30. The shortest detectable wave- length is near 2900 A, varying markedly with locality air mass, and season. Thus, Dorno reports for Davos (46, cf. pages 36, 53) that the limit varies from 2973 A at midday in July to 3093 A in 8,000 10,000 14,000 16,000 18,000 20,000 Fig. 21.—Spectral dis
. Biological effects of radiation; mechanism and measurement of radiation, applications in biology, photochemical reactions, effects of radiant energy on organisms and organic products. Radiation; Biology. VISIBLE AND NEAR-VISIBLE RADIATION 175 Forsythe and Christison (28), Fig. 30. The shortest detectable wave- length is near 2900 A, varying markedly with locality air mass, and season. Thus, Dorno reports for Davos (46, cf. pages 36, 53) that the limit varies from 2973 A at midday in July to 3093 A in 8,000 10,000 14,000 16,000 18,000 20,000 Fig. 21.—Spectral distribution of radiation from the sun, outside the atmosphere, and at air masses 1, 2, 3, 4, and 5, on a clear dry day at Montezuma, precipitable water cm. {From data of Abbot, 4.) o On August 29, 1909, the value at noon was 2963 A, while from 5 to 6 , it was 3202 A. Even with sun at zenith, the fall in intensity in proceeding to shorter wave-lengths is extremely great. Laurens (46, cf. page 38) gives the value at 2929 A as only 1/10,000 of that for 3140 A. Consequently, if one undertakes to evaluate intensities. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Duggar, Benjamin M. (Benjamin Minge), 1872-1956; National Research Council (U. S. ). Committee on the Effects of Radiation on Living Organisms; Clark, Janet Howell, b. 1889; Cole, Kenneth Stewart, 1900-; Daniels, Farrington, 1889-1972. New York and London, McGraw-Hill Book Co.
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