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Influence of magnesium chloride on the dose–response of polyacrylamide-type gel dosimeters

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Abstract

We investigated the effect of magnesium chloride (MgCl2) on the nuclear magnetic resonance dose–response of polyacrylamide-type (PAGAT, NIPAM, and VIPET) gel dosimeters containing acrylamide, N-isopropylacrylamide, and N-vinylpyrrolidone as a monomer, respectively. The dose-transverse relaxation rates (1/T2 = R2) obtained from magnetic resonance imaging data revealed that a substantial increase in the dose–R2 response occurred as the concentration of MgCl2 in the gel dosimeters increased. The sensitivity of the PAGAT gel with 1.0 M MgCl2 was found to be approximately one order higher than that of the same gel without MgCl2. In addition, the water equivalences of the gels with MgCl2 were evaluated over a wide range of photon energies. The results indicated that MgCl2 acts as a powerful sensitizer to radiation-induced free-radical polymerization in polyacrylamide-type gel dosimeters, but does not interfere with the desirable properties of basic polyacrylamide-type gel dosimeters (i.e., the dose rate and dose integration).

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Authors and Affiliations

  1. Department of Clinical Radiology, Faculty of Health Sciences, Hiroshima International University, Higashi-Hiroshima, Hiroshima, 739-2695, Japan

    Shin-ichiro Hayashi, Shuji Usui & Takahiro Tominaga

  2. Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2 Ami, Ami-machi, Inashiki-gun, Ibaraki, 300-0394, Japan

    Hiraku Kawamura

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  1. Shin-ichiro Hayashi
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  2. Hiraku Kawamura
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  4. Takahiro Tominaga
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Correspondence to Shin-ichiro Hayashi.

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Hayashi, Si., Kawamura, H., Usui, S. et al. Influence of magnesium chloride on the dose–response of polyacrylamide-type gel dosimeters. Radiol Phys Technol 11, 375–381 (2018). https://doi.org/10.1007/s12194-018-0473-2

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  • DOI: https://doi.org/10.1007/s12194-018-0473-2

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