RADON | Occupational Safety and Health Administration

RADON‡

Chemical Identification
CAS #	10043-92-2
Formula	Rn
Synonyms	radon gas; alphatron; niton; radium emanation

Physical Properties
Physical description	Colorless, odorless gas.
Boiling point	-79.1°F	Molecular weight	222.02
Freezing point/melting point	-95.8°F	Vapor pressure
Flash point		Vapor density
Specific gravity		Ionization potential
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating		NFPA fire rating
NFPA reactivity rating		NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	R100
Sampling group
Sampler/Sampling media	EPERM
Sampling time^*	≥10 days
Sampling volume (TWA)^*
Sampling flow rate (TWA)^*
Sampling volume (STEL/Peak/C)^*
Sampling flow rate (STEL/Peak/C)^*
Analytical method instruments
Method reference	OSHA ID-208 (partially validated)
Notes	OSHA staff please contact the SLTC prior to sampling.
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information (see manufacturer instructions)

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA	100 pCi/L (This is the limit that a worker (over 18 years of age) can be exposed to in 40 hours in a consecutive 7 day period.)	REL-TWA		TLV-TWA		PEL-TWA
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL
PEL-C		REL-C		TLV-C		PEL-C
Skin notation	NA	Skin notation	NA	Skin notation	NA	Skin notation	NA
Notes: See 29 CFR 1910.1096(c)(1).		Notes: Not established		Notes: Not established		Notes: Not established
Health factors: See NIH-NLM PubChem.		IDLH
Carcinogenic classifications: IARC-1, NTP		Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Not listed

NIOSH: Pocket Guide to Chemical Hazards - Not listed

Literature References

International Chemical Safety Cards (WHO/IPCS/ILO): Radon.
EPA Air Toxics Website: Radionuclides (including Radon, Radium and Uranium). U.S. Environmental Protection Agency Technology Transfer Network.
U.S. Department of Justice: Radiation Exposure Compensation Program: About the Program (June 7, 2004) 5 pp.
Archer, V.E., Coons, T. Saccomanno, G. and Hong, D.Y.: Latency and the lung cancer epidemic among United States uranium miners. Health Phys. 87 (5): 480-489, 2004.
Archer, V.E., Renzetti, A.D., Doggett, R.S., Jarvis, J.Q. and Colby, T.V.: Chronic diffuse interstitial fibrosis of the lung in uranium miners. J. Occup. Environ. Med. 40 (5): 460-474, 1998.
Frumkin, H. and Samet, J.M.: Radon. CA Cancer J. Clin. 51 (6): 337-344, 2001.

Last Updated Date : 01/11/2021

RADON‡

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References