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Council on Physical Therapy

JAMA. 1940;114(4):325-326. doi:10.1001/jama.1940.02810040035011.
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Coblentz, W. W.:  Ultraviolet Radiation Useful for Therapeutic Purposes , J. A. M. A. 98:1082 ( (March 26) ) 1932
Link to Article[[XSLOpenURL/10.1001/jama.1932.02730390036011]]
99:125 (July 9) 1932.
 Acceptance of Sunlamps , J. A. M. A. 102:42 ( (Jan. 6) ) 1934.
Link to Article[[XSLOpenURL/10.1001/jama.1934.02750010042011]]
Coblentz, W. W.; Stair, R., and Hogue, J. M.:  Tests of a Balanced Thermocouple and Filter Radiometer as a Standard Ultraviolet Dosage Intensity Meter , Bur. Stds., J. Research 8:759, 1932 (R. P. No. 450, 10 cents).
Link to Article[[XSLOpenURL/10.6028/jres.008.057]]
In the metric system the numerical value of a unit is 1, 10, and so on. For convenience the Council uses the value 10 to conform with scientific usage instead of the value 20 (i. e., 2 × 10) noted in the text. The final result is the same.
More specifically, the energy of wavelengths shorter than and including 2,800 angstroms shall not exceed 1 per cent of the total energy of wavelengths between 2,804 and 3,132 angstroms.

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