Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8249946 | Radiation Measurements | 2018 | 36 Pages |
Abstract
Signal development of irradiated Methylthymol blue (MTB) Fricke gelatin gel dosimeter was studied using nuclear magnetic resonance (NMR) in terms of the spin-spin relaxation rate (R2) of hydrogen protons within the water molecule. The optical properties of MTB gel were also studied using a spectrophotometric technique. The gel dosimeter presents a linear response for doses up to 20Â Gy with ultraviolet visible (UV-Vis) spectrophotometry and 40Â Gy with NMR. For a 0.1Â mM MTB concentration and dose of up to 10Â Gy, the sensitivity of the gel response analyzed by a spectrophotometer is 0.077 a.u. Gyâ1 at 620Â nm with a linear coefficient of (r2Â =Â 0.998), while the R2 sensitivity is 0.02Â sâ1Â Gyâ1 with a linear coefficient of (r2Â =Â 0.998). The sensitivity of the Fricke-MTB dosimeter was higher when compared with the Fricke-XO dosimeter. The dose rate and photon energy beams were dependent of the absorbance and R2 dose sensitivity, as observed over the range studied. The Fricke-MTB gelatin dosimeters can be scanned at higher wave lengths than the conventional Fricke-XO gelatin formulations.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Molham M. Eyadeh, Khalid A. Rabaeh, Tariq F. Hailat, Feras M. Aldweri,