Fig. 1.
Roselle dosimeter in oriented polypropylene setup.
Fig. 2.
FEP’s laboratory EB facility REAMODE (left) with linear module (right).
Fig. 3.
Depth-dose distribution in the liquid layer.
Fig. 4.
Absorbance spectra of Roselle dosimeter at different doses (left) and absorbance spectra from Handayani and Imawan [9] (right).
Fig. 5.
Roselle dosimeter irradiated at 0, 0.6, 1.3, and 2.5 kGy.
Fig. 6.
Maximum absorbance of Roselle dosimeter at 520 nm peak vs. reference dose (left) and calibration curve of Roselle dosimeter: dosimeter response vs. reference dose (right).
Table 1.
Relative change in peak absorbance of Roselle dosimeter solution at set time intervals. Negative values indicate a decrease in peak absorbance
| Dose (kGy) | Peak absorbance | Relative change in peak absorbance (%) | |||||
|---|---|---|---|---|---|---|---|
| 10 min | 20 min | 30 min | 40 min | 1 h | 96 h | ||
| 0 | 3.74 | 0.6 | 3.9 | 4.1 | –0.3 | –1.1 | –68.8 |
| 0.3 | 2.93 | –0.5 | –1.5 | –2.2 | –2.9 | –8.3 | –53.9 |
| 0.9 | 2.61 | –1.3 | –2.2 | –3.1 | –9.5 | –9.5 | –55.6 |
| 1.8 | 1.20 | –0.7 | –0.7 | –1.5 | –1.9 | –12.1 | –59.1 |
| 3.8 | 1.05 | 0.9 | 2.4 | 4.3 | 5.5 | 5.3 | –3.2 |
| 7.5 | 0.51 | 5.0 | 10.6 | 15.9 | 21.0 | 42.1 | 21.4 |