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Quantifiable Polymeric Fluorescent Ratiometric γ-ray Chemosensor.

Bin Pei¹, Hao Su¹, Biao Chen¹

¹Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.

ACS Applied Materials & Interfaces

|August 21, 2020

Summary

This study introduces a new visual dosimeter for detecting gamma rays. The chemosensor, embedded in polymer films, changes color upon irradiation, offering a simple alternative to traditional methods.

Keywords:

acid generation pH sensor radiation chemistry of polymer ratiometric fluorescence sensing γ-ray detection

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Area of Science:

Materials Science
Radiation Detection
Analytical Chemistry

Background:

Gamma-ray detection is crucial for high-energy physics, nuclear medicine, national security, and space exploration.
Current methods often rely on ionization effects, limiting their scope and application.
There is a need for alternative, quantifiable gamma-ray detection techniques.

Purpose of the Study:

To develop a novel, quantifiable gamma-ray chemosensor.
To utilize secondary effects of ionizing radiation for detection.
To create a visual dosimeter complementary to existing technologies.

Main Methods:

Screening commercially available polymers for sensitivity to gamma-ray-induced acid generation.
Designing and embedding a pH-sensitive fluorescent quinoline derivative into poly(methyl methacrylate) (PMMA) and polyvinyl chloride (PVC) films.
Establishing a ratiometric fluorescence intensity response to gamma-ray dosage.

Main Results:

Poly(methyl methacrylate) (PMMA) and polyvinyl chloride (PVC) were identified as sensitive polymers for gamma-ray-induced acid generation.
The embedded fluorescent quinoline derivative showed a dramatic emission shift from blue (460-480 nm) to red (570-620 nm) upon gamma irradiation.
A linear response of ratiometric fluorescence intensity (I_red/I_blue) to gamma-ray dosage was established over a wide range (80-4060 Gy).

Conclusions:

A quantifiable, secondary-effect-based gamma-ray chemosensor was successfully developed.
The developed sensor provides a practical visual dosimeter with a linear response to gamma-ray dosage.
This novel approach offers a complementary method to current gamma-ray detection and spectrometry techniques.