Dosimetric characteristics of N-vinylpyrrolidone based polymer gels: utilization depending on dose range

7th International Conference on 3D Radiation Dosimetry

Papoutsaki, M.-V.^1 ; Pappas, E.^2 ; Papadakis, A.E.^3 ; Varveris, C.^4 ; Damilakis, J.^1 ; Maris, T.G.^1

Department of Medical Physics, University of Crete, Medical School, Staurakia 71110, Crete, Greece^1

Department of Medical Radiological Technologists, Technological Educational Institute of Athens, Egaleo, 12210, Athens, Greece^2

Department of Medical Physics, University Hospital of Heraklion, Staurakia, 711110, Crete, Greece^3

Department of Radiation Therapy, University of Crete, Medical School, Staurakia, 711110, Crete, Greece^4

关键词: Confidence levels;    Dose response;    Dose sensitivity;    N vinylpyrrolidone;    Offset values;    Polymer gel dosimeter;    Postirradiation;    Temporal stability;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/444/1/012068/pdf
DOI  :  10.1088/1742-6596/444/1/012068

来源: IOP

【 摘 要 】

In this study, two types of normoxic N-vinylpyrrolidone based polymer gel, VIPET1vand VIPET2v, were presented. VIPET2vhad the double amount of monomer compared to the VIPET1v. The influence of this difference in the dosimetric characteristics of the polymer gel dosimeters was investigated. The doubling in N-vinylpyrrolidone concentration increased the dose sensitivity in the linear dose range region and improved the dose resolution at 95% confidence level for lower doses (D1vwas sensitive in the dose range of 2 to 60 Gy, while VIPET2vwas sensitive in the dose range of 1 to 30 Gy. Moreover, both gels showed a linear R2-dose response for one month post-irradiation time period. During this time, variations in dose sensitivity and offset values of both dosimeters were observed. Finally, the dose resolution temporal stability was studied and was eventually improved by doubling the N-vinylpyrrolidone concentration.