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Baldock, C. et al.

Baldock, Rintoul, Keevil, Pope, George,

Fourier transform Raman spectroscopy of polyacrylamide gels (PAGs) for radiation dosimetry.

Polyacrylamide gels (PAGs) are used for magnetic resonance imaging radiation dosimetry. Fourier transform (FT) Raman spectroscopy studies were undertaken to investigate cross-linking changes during the copolymerization of polyacrylamide gels in the spectral range of 200-3500 cm(-1). Vibrational bands of 1285 cm(-1) and 1256 cm(-1) were assigned to acrylamide and bis-acrylamide single CH2 deltaCH2 binding modes. Bands were found to decrease in amplitude with increasing absorbed radiation dose as a result of copolymerization. Principal component regression was performed on FT-Raman spectra of PAG samples irradiated to 50 Gy. Two components were found to be sufficient to account for 98.7% of the variance in the data. Cross validation was used to establish the absorbed radiation dose of an unknown PAG sample from the FT-Raman spectra. The calculated correlation coefficient between measured and predictive samples was 0.997 with a standard error of estimate of 0.976 and a standard error of prediction of 1.140. Results demonstrate the potential of FT-Raman spectroscopy for ionizing radiation dosimetry using polyacrylamide gels.[1]

References

Fourier transform Raman spectroscopy of polyacrylamide gels (PAGs) for radiation dosimetry. Baldock, C., Rintoul, L., Keevil, S.F., Pope, J.M., George, G.A. Physics in medicine and biology. (1998) [Pubmed]

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