Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 600
from the portions of the tube outsidethe focal spot. Since all this radiation is diffuse in character, theradiation falling in the shadow of the lead disk B will be termeddiffuse radiation while the image-forming radiation received bythe film from the focal spot will be called focal radiation.… … the diffuse radiation (D) falling in the shadow of the lead diskto that of the total radiation (T) falling outside this shadow. The ratio of diffuse to total radiation,-^, was first measured forvarious thicknesses of water and for various sizes of image aslimited by the lead cylinder A. The…
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