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Irradiated Milk: The Transmission and Antirachitic Activation of Milk Films by Ultra-Violet Radiations

The Dry Milk Company, Research Laboratories, Bainbridge, New York
National Carbon Company, Cleveland, Ohio

ABSTRACT

Data previously reported have shown the degree of antirachitic activity imparted to milk by different sources and intensities of ultraviolet radiation (1, 2, 3). It was found that a low intensity of radiation applied for relatively long periods of time was not as effective in increasing the antirachitic potency as radiations of high intensity applied for shorter periods of time, the total energy applied per unit amount of milk being substantially the same in both instances. These observations were obtained under controlled commercial conditions involving large quantities of milk irradiated as flowing films about 0.4 millimeters thick and for time periods varying from 8 to 48 seconds. While this procedure is not considered to have affected the validity of the conclusions, nevertheless, it seemed desirable to undertake more detailed studies designed to determine the degree of activation as affected by such interrelated factors as, depth of penetration of the activating rays, characteristics of the irradiated film and time of exposure.