Three-dimensional radiation dosimetry based on optically-stimulated luminescence

TL;DR

This paper introduces a novel 3D dosimetry method using optically-stimulated luminescence embedded in a transparent silicone matrix, enabling direct optical readout of dose distribution with high sensitivity and reusability.

Contribution

It presents a new 3D dosimeter design combining OSL particles with silicone, allowing direct optical measurement of radiation dose distribution without complex reconstruction.

Findings

Achieved >10,000 detected photons per 1mm³ voxel at 1 Gy dose

Demonstrated effective 3D dose readout without computational inversion

Showed dosimeters can be reused and stored with minimal fading

Abstract

A new approach to three-dimensional (3D) dosimetry based on optically-stimulated luminescence (OSL) is presented. By embedding OSL-active particles into a transparent silicone matrix (PDMS), the well-established dosimetric properties of an OSL material are exploited in a 3D-OSL dosimeter. By investigating prototype dosimeters in standard cuvettes in combination with small test samples for OSL readers, it is shown that a sufficient transparency of the 3D-OSL material can be combined with an OSL response giving an estimated >10.000 detected photons in 1 second per 1mm3 voxel of the dosimeter at a dose of 1 Gy. The dose distribution in the 3D-OSL dosimeters can be directly read out optically without the need for subsequent reconstruction by computational inversion algorithms. The dosimeters carry the advantages known from personal-dosimetry use of OSL: the dose distribution following irradiation can be stored with minimal fading for extended periods of time, and dosimeters are reusable as they can be reset, e.g. by an intense (bleaching) light field.