Assessment of photon energy and dose rate dependence of U-NIPAM polymer gel dosimeter

One of the main drawbacks of NPAM gel dosimeter is its relatively low R2-dose sensitivity. Recently, the sensitivity of NIPAM gel dosimeter has been improved by adding urea and this new formula gel dosimeter was named U-NIPAM (Urea and NIPAM). In the current project, photon energy and dose rate depe...

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Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2020-07, Vol.172, p.108784, Article 108784
Main Authors: Abtahi, Seyed Mohammad Mahdi, Anaraki, Vahid, Farhood, Bagher, Mahdavi, Seied Rabi
Format: Article
Language:English
Subjects:
Dependence
Dose rate
Evaluation
Photon energy
Photons
Polymer gel dosimetry
Polymer gels
Radiation dosage
Sensitivity
U-NIPAM
Urea
Ureas
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Summary:One of the main drawbacks of NPAM gel dosimeter is its relatively low R2-dose sensitivity. Recently, the sensitivity of NIPAM gel dosimeter has been improved by adding urea and this new formula gel dosimeter was named U-NIPAM (Urea and NIPAM). In the current project, photon energy and dose rate dependence of optimized U-NIPAM gel dosimeter (with 3% urea) was assessed by MRI technique. The gel samples were fabricated under normal atmospheric conditions and after 1 day, they were exposed to photon energies of 6 and 15 MV and dose rates of 300, 400, and 500 cGy/min. Then, MRI responses (R2) of the U-NIPAM gel samples were analyzed at 12, 36, 72, 168 h after the irradiation process. The dosimetric evaluation of optimized U-NIPAM gel dosimeter characteristics at 12 h after the irradiation process resulted to following findings: 1) different photon energies (6 and 15 MV) have significant effect on the R2-dose sensitivity of gel dosimeter in 0–7 Gy dose range (P 
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2020.108784