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Published on: March 11, 2021
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Source efficiency of alpha-emitters applied to the skin surface
E Kim1, M Narita1, Y Takashima1
1National Institutes for Quantum Science and Technology (QST), Chiba 263-8555, Japan.
Radiation Protection Dosimetry
|October 11, 2023
Summary
Alpha-emitter contamination on skin is not hazardous unless skin is injured, which can lead to internal exposure. Surface irregularities like wrinkles reduce measurement accuracy for alpha emitters.
Area of Science:
- Radiological Protection
- Nuclear Science
- Dermatology
Background:
- Skin surface contamination by alpha-emitters poses risks of internal exposure via injured skin.
- Direct in vivo measurements, such as lung counting, can be misjudged due to skin contamination.
- Understanding radionuclide behavior on skin is crucial for accurate exposure assessment.
Purpose of the Study:
- To determine the source efficiency of alpha-emitters on swine skin samples.
- To investigate the impact of skin surface characteristics on alpha-emitter measurements.
- To analyze alpha-particle energy spectra for self-absorption effects.
Main Methods:
- Utilized advanced alpha-spectrometric simulation.
- Applied Americium-241 (241Am) to swine skin samples.
- Analyzed observed alpha-particle energy spectra to determine source efficiency.
Main Results:
- The average source efficiency for 241Am on swine skin was determined to be 0.365 (alpha-particle s-1 per Bq).
- This is lower than the theoretical efficiency of 0.5 due to self-absorption.
- Radionuclide entry into hair follicles and wrinkles significantly decreased source efficiency.
- Spectral degradation indicated radionuclide penetration into the stratum corneum.
Conclusions:
- Skin surface irregularities, such as hair follicles and wrinkles, significantly affect the source efficiency of alpha-emitters.
- The findings suggest that direct alpha measurements can be compromised by skin surface topography.
- Further research on human skin is warranted to confirm these observations in radiological protection contexts.
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