An external ion microbeam for studies of biological samples

Area of Science:

• Physics
• Materials Science
• Analytical Chemistry

Background:

• High spatial resolution is crucial for micro-particle-induced X-ray emission (PIXE) analysis.
• External microbeams offer advantages for analyzing biological samples in ambient conditions.
• Multiple scattering in beam exit windows poses a significant challenge to achieving high spatial resolution.

Purpose of the Study:

• To develop and evaluate a new external ion-beam system for micro-PIXE analysis.
• To investigate the feasibility of maintaining 1-micron spatial resolution for biological sample analysis in air.
• To assess the performance and durability of thin Kapton films as beam exit windows and sample backings.

Main Methods:

• Integration of a new external ion-beam system with a light ion-microbeam system.
• Utilization of a thin Kapton film (7.5 microns) as a beam exit window and sample backing.
• Investigation of foil lifetime under ion irradiation.
• Evaluation of spatial resolution with the external microbeam.

Main Results:

• The developed system successfully achieved nearly 1-micron spatial resolution.
• The thin Kapton film demonstrated sufficient durability for long-time ion irradiation.
• Elemental maps could be acquired with the established high spatial resolution.
• Minimal distance between the Kapton film and samples was maintained.

Conclusions:

• The new external ion-beam system is effective for high-resolution micro-PIXE analysis of biological samples in air.
• Thin Kapton films are suitable materials for beam exit windows and sample backings in micro-PIXE applications.
• The system enables precise elemental mapping with minimal degradation of spatial resolution.