Color Radiofieldgraphy

概要

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A method for taking multi-colored overall picture of dose distribution in the radiation field by means of color radiography was proposed and denominated as "Color radiofieldgraphy" by the authors. Sentitizers suitable for this object were made of agar-gel stained with indigo carmine, naphthol yellow and tetrazolium red. These sentitizers were changed their color according to irradiation doses from green to white, yellow, red, and reddish purple. By setting this sentitizer in the radiation field of electron beams, gamma rays or x-rays, multi-colored picture of the radiation field was easily taken without developing process. By this method so many inadequate locations for irradiation by common irradiators were easily found. Moreover, many interesting informations were obtained by this method, e.g., pictures of x-rays field of higher energy resembling the form of ballistics wave, and not negligible difference in the irradiation effects between the center and the periphery of the irradiated material of any thickness. The latter effect was observed not only in the neighbour of the surface faced to the air but also in the vicinity of the barrier part of different density inside the irradiated material. This effect which we call "Rand effect" or "Barrier effect" was observed even in the ir-radiated thinner film.
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