. Biophysics: concepts and mechanisms. Biophysics. IONIZATION AND DETECTION 111 shows a lead-collimated scintillation counter, useful, for instance, for ex- ploring the thyroid after radioactive iodine has been administered. External exploration of the organ for determination of size is known as scintography. Mechanical devices have been designed which control the exploration and print a map of the intensity of radiation from that area of the throat. (4) Chemical Reactions Induced in Aqueous Solutions: Water is broken up into H and OH, and these very reactive products undergo reactions with so
. Biophysics: concepts and mechanisms. Biophysics. IONIZATION AND DETECTION 111 shows a lead-collimated scintillation counter, useful, for instance, for ex- ploring the thyroid after radioactive iodine has been administered. External exploration of the organ for determination of size is known as scintography. Mechanical devices have been designed which control the exploration and print a map of the intensity of radiation from that area of the throat. (4) Chemical Reactions Induced in Aqueous Solutions: Water is broken up into H and OH, and these very reactive products undergo reactions with solutes to produce new chemicals. Oxidations or reductions, molecular rearrange- ments, polymerization of plastics, and corrosion of metals have all been used as detectors. Important quantitative aspects of absorption of ionizing radia- tion by aqueous tissues are developed in Chapter Figure 5-6. Collimated Scintillation Counter. Top: disassembled to show photo- multiplier assembly. Bottom: assembled. With collimator (left) attached, the instrument can be used for scintography—tor detailed external mapping of the human body, above the liver for example, following internal administration of the appropriate radioactively-labeled chemicals. (Photographs courtesy of Burndepts Ltd., Erith, England.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Casey, Edmund Jeremiah, 1924-. New York, Reinhold Pub. Corp
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