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A Useful Accessory to the Directional Caliper

Assistant Physicist of the Radium Beam Therapy Research, 1934–1935

This excerpt was created in the absence of an abstract.

In a previous communication Dr. T. A. Green, of the Radium Beam Therapy Research, has described the construction and uses of his directional caliper.¹ The co-ordinates supplied by this do not enable a point to be located immediately on an isodose chart, since the point's distance normally from the beam's axis involves two of them in a rather complicated way. An instrument has, therefore, been devised (a dosage rate indicator) which will locate a point on any isodose chart directly from the co-ordinates supplied by the directional caliper, correcting for zero errors automatically. This instrument can be used competently by a clerk, and it has greatly facilitated the daily computation of doses delivered to several points in each patient of the Radium Beam Therapy Research.

Revision received October 1, 1936.