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13 C‐NMR, 1 H‐NMR, and FT‐Raman study of radiation‐induced modifications in radiation dosimetry polymer gels
Author(s) -
Lepage M.,
Whittaker A. K.,
Rintoul L.,
Baldock C.
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20010228)79:9<1572::aid-app50>3.0.co;2-b
Subject(s) - polymer , gelatin , dosimeter , materials science , irradiation , polyacrylamide , nuclear magnetic resonance spectroscopy , relaxation (psychology) , raman spectroscopy , proton , proton nmr , polymer chemistry , nuclear magnetic resonance , chemistry , analytical chemistry (journal) , dosimetry , organic chemistry , nuclear medicine , optics , medicine , physics , composite material , psychology , social psychology , quantum mechanics , nuclear physics
1 H‐ and 13 C‐NMR spectroscopy and FT‐Raman spectroscopy are used to investigate the properties of a polymer gel dosimeter post‐irradiation. The polymer gel (PAG) is composed of acrylamide, N , N ′‐methylene‐bisacrylamide, gelatin, and water. The formation of a polyacrylamide network within the gelatin matrix follows a dose dependence nonlinearly correlated to the disappearance of the double bonds from the dissolved monomers within the absorbed dose range of 0–50 Gy. The signal from the gelatin remains constant with irradiation. We show that the NMR spin–spin relaxation times ( T 2 ) of PAGs irradiated to up to 50 Gy measured in a NMR spectrometer and a clinical magnetic resonance imaging scanner can be modeled using the spectroscopic intensity of the growing polymer network. More specifically, we show that the nonlinear T 2 dependence against dose can be understood in terms of the fraction of protons in three different proton pools. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1572–1581, 2001