Abstract
The performance of normoxic PAG (nPAG) gel dosimeter with respect to spatial integrity, temperature sensitivity and dose-rate dependency makes it more reliable than PAG gel dosimeter. As a 3D dose distribution measurement in dosimetry, nPAG gel dosimeter with THPC as anti-oxidant, named PAGAT was studied. 2.9% mass concentration of the formaldehyde solution was added into PAGAT to solidify the gel, named PAGAT-f. The melting point of PAGAT-f polymer gel was increased by adding formaldehyde and can be stored at room temperature after gel preparation without refrigeration. After irradiation with a 9 MV LINAC, magnetic resonance imaging (MRI) is employed as readout modality. It’s found that by adding formaldehyde, R2-dose response of PAGAT-f is similar to PAGAT but the dose response sensitivity of PAGAT-f is better than that of PAGAT at low doses. The results prove the feasibility and good temporal stability of PAGAT-f for dose distribution measurement.
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