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Mar. 15,1940 Dr. F. B. Flinn, DeLamar Institute of Public Health, 600 W. 168th St. New York City. Dear Dr. Flinn: The 15 plates we are today sending you herewith are troated with a total of 5 milligrams radium. A preliminary measurement indicates that the radium is tightly bound, and that a large percentage of the alpha radiation is available. The plates were troated on Maroh 12th, and con- seguently will not reach their peak value for sevoral weeks. In packing, the plates have been placed in a container with the troated sido upe Via are also enclosing a bill for $350.00 which covers in part cost of materials used. We trust you will find these plates satisfactory, and that they will accomplish the work for which you intend theme Very truly yours, CWWallhausen;dk Chief Chemist enc. Dr. B.T. then G.D.