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Bucky has been the leader in the development of the "Grenz" or "borderline" rays. These rays are described in the book from a physical standpoint by Otto Glasser, who says: "It must be understood that there is no sharp boundary between radiations which are called ultraviolet rays and those called roentgen rays. From a physical point of view, this boundary is a relatively broad band."
Bucky claims that the radiation beams of from 1 (0.00000001 cm.) to 3 Angström units have biologic effects different from those produced by the shorter roentgen rays or the longer ultraviolet rays. He therefore calls these "Grenz rays" (border rays). Glasser describes the apparatus and method of producing and measuring these rays, using from 4 to 12 kilovolts. The average absorption in skin tissue was found to be approximately from 0.35 to 0.69 mm. half value layer, allowing about 14 per cent to pass through
Grenz Ray Therapy. Arch NeurPsych. 1930;24(1):226. doi:10.1001/archneurpsyc.1930.02220130229028
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