Alpha Particles (α)

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Alpha particles are a form of ionizing radiation emitted by radioactive materials such as uranium, thorium, radium, and radon. Because alpha particles have low penetrating power and are stopped by a sheet of paper or the outer layer of skin, external exposure is generally not a concern. However, inhalation or ingestion of alpha-emitting radionuclides — most notably radon gas in mines and buildings — poses a significant internal radiation hazard and is a leading cause of lung cancer among non-smokers. Industrial hygienists monitor alpha particle activity in environments such as uranium mining, nuclear fuel processing, and radiological laboratories.

Alpha particle monitoring helps identify contamination risks where alpha-emitting materials may be present. Rent alpha detection instruments from RAECO Rents for radon and remediation work, mining and milling environments, and nuclear or research facilities. Our team provides practical guidance on the right detector and survey approach, with fast turnaround and phone support so you can collect usable field readings.

Regulatory Exposure Limits

Updated on March 09, 2026

OSHA PEL
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STEL: N/A
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NIOSH REL
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ACGIH TLV
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Frequently Asked Questions
Common questions about
What should I know before renting alpha survey equipment?
Alpha radiation has very limited range in air and is stopped by most materials. Alpha survey instruments need to be used very close to the surface (within a centimeter or less) and in conditions where contamination isn’t covered by water, dust, or other material. Confirm the isotope(s) of concern, whether surface or air sampling is needed, and whether you need a wipe-and-count approach versus direct measurement.
Can a regular Geiger counter detect alpha contamination?
Usually not reliably. Alpha requires a thin-window or dedicated alpha-capable probe and very close technique—small air gaps can block alpha from reaching the detector, even if contamination is present.
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