A practical alpha particle irradiator for studying internal alpha particle exposure.

Area of Science:

• Radiation Biology
• Biophysics
• Cellular Biology

Background:

• Radon and its progeny emit alpha particles, posing a risk to the human respiratory tract.
• Understanding cellular responses to alpha radiation is crucial for risk assessment.

Purpose of the Study:

• To develop and validate an alpha particle irradiator at Seoul National University (SNU).
• To simulate alpha particle energies from radon progeny (Po-218, Po-214) for cellular studies.
• To investigate cellular responses to alpha emissions.

Main Methods:

• Designed an alpha particle irradiator with specific cell culture setups (4µm Mylar bottom dishes, slide setup for gamma-H2AX assay).
• Performed dose calibration using dual approaches: direct detection and computer simulation.
• Optimized source-to-target distance (STD) and cell dish size for uniform dose distribution.

Main Results:

• The SNU alpha particle irradiator successfully simulates alpha particle energies comparable to radon progeny.
• Dose calibration confirmed the reliability of the irradiation system.
• The gamma-H2AX assay demonstrated the irradiator's performance in detecting DNA damage in human lung epithelial cells.

Conclusions:

• The SNU alpha particle irradiator is a reliable tool for investigating cellular responses to alpha radiation.
• This system enables accurate simulation of in-vivo alpha particle exposure conditions.
• The validated irradiator supports further research into the biological effects of radon exposure.