Two-Dimensional UVA Dose Mapping Using a TTC-Pluronic F-127 Hydrogel Dosimeter.

Area of Science:

• Materials Science
• Radiological Physics
• Biophysics

Background:

• Accurate monitoring of ultraviolet (UV) radiation dose distribution is vital across various scientific and medical fields.
• Traditional point-of-care dosimetry methods struggle to capture the full spatial extent of irradiated surfaces.
• There is a need for advanced dosimetry systems capable of detailed spatial dose assessment.

Purpose of the Study:

• To characterize a novel two-dimensional (2D) dosimetry system for UVA radiation monitoring.
• To evaluate the performance of a Pluronic F-127 hydrogel matrix doped with 2,3,5-triphenyltetrazolium chloride (TTC).
• To assess the system's suitability for mapping heterogeneous UV radiation dose distributions.

Main Methods:

• Development of a 2D dosimeter using Pluronic F-127 hydrogel and TTC as a colorimetric indicator.
• Preparation of dosimeter samples in PMMA containers and exposure in a UVP CL-1000 chamber.
• Characterization using flatbed scanning, image analysis software, and comparison with Kodak X-Omat UV Film dosimetry.

Main Results:

• The TTC-Pluronic F-127 system demonstrated a reproducible response (R² = 0.9967) in the 0-5000 mJ/cm² dose range.
• Significant heterogeneity in UV dose distribution (CV ≈ 18%) was observed, highlighting the need for 2D dosimetry.
• The system successfully generated precise 2D dose distribution maps and resolution tests confirmed geometric accuracy.

Conclusions:

• The TTC-Pluronic F-127 hydrogel system is an effective, simple, and low-cost tool for 2D UVA radiation monitoring.
• The system provides precise spatial dose distribution maps, essential for validating irradiation devices.
• Potential applications include cosmetology, dermatology, and material ageing studies requiring accurate UV dose assessment.