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Extra info for Physical Chemical Techniques. Physical Techniques in Biological Research
L. 28 60 60 a GOB. 4 Κ Β Κ B-S B-S K , Kuppermann (1967) theoretical values; B, Buxton (1967) appraisal of experi mental values; B-S, Barr and Schüler (1957). EZ+ = 3GH + 2 ( Τ Η 2ο 2 + GOB- given in Table VIII. Balance of oxidizing and reducing equivalents, or material balance, requires that GE~~ + GB + 2GB2 = #ΟΗ + 2 ( r H 20 2 (31) but experimental values may fail to give exact balance. As shown in the table, G values depend on both LET and pH. More than 20 chemical reactions have been proposed between these species (Hochanadel, 1960; Hart, 1965b).
A brief review of dosimetry for tissue-filled cavities in bone is available 42 Μ. L. RANDOLPH FIG. 7. Distribution of X-ray intensities at 50 cm from target. Above is shown a relatively symmetric field and below a relatively peculiar field. Data were taken with two different 300-kVp General Electric Maxitron therapy machines. Notice rapid change in intensity versus radius when at radii of about 20 cm. 1. MEASUREMENT AND PROPERTIES OF IONIZING RADIATIONS 43 MUSCLE ENERGY(MeV) H V L ( m m Cu) FIG.
L. RANDOLPH ping powers, etc. Calorimetry is a primary system for measurement of dose, but not of exposure since the value of W surely depends on ioniza tion measurements. Ionization is clearly a primary method for measure ment of exposure, but not necessarily of dose because W is often obtained by combined calorimetric and ionization measurements. , as Chappell and Sparrow (1968) have for α-particles—ionization becomes a primary method for dose. Calculations from fluence yield kerma unless corrections are made for bremsstrahlung and secondary equilibrium.