For over 40 years, RSSI has been a national leader in radiation safety and radiological health consulting.  Since its founding in 1975 by Herman Cember and Eli Port, RSSI's goal has been to serve clients with cost-effective solutions to keep people safe and clients in compliance with applicable laws and regulations.

RSSI provides our clients with:

• Radiation safety support and consulting on regulatory issues,

• Ongoing radiation safety program management and support,

• Technical expert and public communication assistance,

• A full service radiological laboratory, and

• Purchase a sealed source leak test kit.

• Contact us regarding gamma spectroscopy.

• An in-house radiation survey meter calibration range.

• Please use a calibration service request form when sending us an instrument.

Our comprehensive experience, diverse radiation safety services and commitment to innovative solutions has enabled us to build lasting relationships with a broad base of clients from business and industry, medicine, academic institutions, and state and federal government agencies. Learn more about RSSI's history here. 

RSSI manufactures and analyzes the most accurate alpha track radon gas test kits available today.

• Purchase a home radon gas test kit.

• Download a copy of our consumer data card here.

• Professional customers can download our bulk spreadsheet here.

• Register your kit to get a reminder email when its time to return it for analysis.

• Check the results of your home- or professional-use radon gas test kit.

• Learn more about radon, the health risks of radon gas, and how to check your home or building for radon gas.

• Contact us regarding our radon measurement professional services for on-site radon detector placement in Illinois.

For more information about RSSI, our services, or products, please contact us.

RSSI is authorized under Illinois Emergency Management Agency License IL-01429-01 and is recognized by the US Nuclear Regulatory Commission and all Agreement States. Canadian services are authorized by Canadian Nuclear Safety Commission R116 and R117.  RSSI is accredited to the ISO/IEC 17025:2017 standard by Perry Johnson Laboratory Accreditation (PJLA) under accreditation number 101315.  Laboratory testing services are performed under certificate L21-761.  Calibration services are performed under certificate L21-760.