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The rate of decay of free radical concentration in irradiated polyamides has been measured by observing the changes in transient optical density of polyamide films at the wavelength of maximum absorption. The dependence of initial radical concentration and of the initial rate constant for radical decay on radiation dose has been interpreted as resulting from the nonhomogeneous placement of radical “spurs” at low doses. The results are consistent with a “spur” diameter of 30–40 A.
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Joseph Zimmerman (1960) studied this question.
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