Radiation Alert®

by S.E. International Inc.

Reliable Radiation
Detection Solutions

Built for Safety, Backed by Science.

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Radiation Detection Equipment & Safety Monitoring Instruments

S.E. International, Inc. (SEI) is a leading radiation detection equipment manufacturer producing the Radiation Alert® line of portable radiation detectors, area monitors, radiation dosimeters, survey meters, and portal monitors. Whether you need a handheld radiation detector for fieldwork, a fixed radiation monitoring system for your facility, or a radiation portal monitor for scrap metal screening, SEI has a solution built for your application.

Radiation Alert® Products — Detectors, Monitors & Dosimeters

SE International designs and manufactures a full line of radiation detection instruments for professional and industrial use. From analog survey meters and digital radiation detectors to contamination monitors and radiation spectrum analyzers, every Radiation Alert® product is built and serviced in the USA.

Radiation Alert® Ranger

Radiation Alert® Ranger

Handheld Nuclear Radiation Survey Meter The Radiation Alert Ranger® is...

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Radiation Alert® Ranger EXP

Radiation Alert® Ranger EXP

Handheld NORM & Low‑Level Radiation Survey Meter The Radiation Alert...

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Radiation Alert® Frisker

Radiation Alert® Frisker

Compact Handheld Radiation Contamination Monitor The Radiation Alert® Frisker is...

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Why Choose SE International for Radiation Detection Equipment?

SE International has been a trusted radiation detector manufacturer and supplier since 1979. Here’s why radiation safety professionals, labs, hospitals, industrial facilities, and government agencies choose Radiation Alert®:

  • U.S.-Based Radiation Detector Manufacturer — Radiation Alert® products are designed, built, and serviced by SEI in Summertown, Tennessee.
  • Full-Spectrum Radiation Safety Equipment — One supplier for handheld detectors, fixed area monitors, dosimeters, portal monitors, and spectrum analyzers.
  • NRC-Compliant Radiation Detection Instruments — Our instruments meet regulatory requirements for nuclear facilities, medical facilities, and government agencies.
  • Radiation Instrument Calibration Service — SEI provides calibration and service for Radiation Alert® instruments to keep your equipment performing to spec.
  • Worldwide Distribution Network — Radiation Alert® products are distributed in over 100 countries through our global distributor network.
  • Free Monitoring Software — Every compatible Radiation Alert® instrument includes free PC-based and Android mobile radiation monitoring software.

Radiation Detection Solutions for Every Industry

SE International provides radiation monitoring equipment and safety solutions across a wide range of industries and applications.

Government & Security

Government & Security
Healthcare

Healthcare
Industry & Manufacturing

Industry & Manufacturing
Laboratories & Education

Laboratories & Education
Nuclear & Health Physics

Nuclear & Health Physics
Public Safety

Public Safety

Introducing the
NuCLEARANCE Portal Monitor

Radiological Risk
Mitigation for Facilities

A scalable solution to prevent radiation from entering or leaving any facility.

Calibration
& Service

We offer Calibration & Service.

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World-wide Distributors

All of North Africa unless otherwise mentioned

India

South Africa

  • Gamma Check CC 📞 27-11-472-098727-83-602-8183Visit Website
    PO BOX 2464 FLORIDA
    JOHANNESBURG , GAUTENG_1710_ South Africa
  • H. Rohloff 📞 +27 (0) 11 704 2233+27 (0) 11 704 5859Visit Website
    TECHNOLOGY HOUSE
    188 NORTHLANDS BUSINESS PARK 29 NEWMARKET ROAD NORTH RIDING
    RANDBURG , SOUTH AFRICA_2194 South Africa

Tunisia

Ionizing Radiation:
The Basics

Ionizing Radiation Basics

Presentation On Ionizing Radiation …

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Radiation Info Links

Radiation Map Websites

Support

Events

Health Physics Society Meeting

AAPM | COMP Annual Meeting & Exhibition

July 19, 2026, 8:00 AM - July 22, 2026, 4:00 PM

Join us July 19-22 Booth 1125 in Vancouver, BC for

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Health Physics Society Meeting

Health Physics Society 71st Annual Meeting

July 6, 2026, 8:00am - July 9, 2026 1:00pm

Join us July 6th-9th in National Harbor, MD for th

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About
SEINTL

Innovation That Protects. Performance That Lasts.

For over 50 years, SE International has provided reliable radiation detection solutions that empower professionals across the globe to work safely and confidently.

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News & Updates

The Crucial Role of Staff Training in Radiation Detection

The Crucial Role of Staff Training in Radiation Detection

Posted on October 24, 2025

In an era where technology plays a pivotal role in safeguarding our well-being, radiation detection

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What Our
Clients Say

“

Ron Ulbrich, Geiger Counter Pro

“The Radiation Alert Ranger® is a great value for those looking for a modern Geiger counter. I found that is simple to use yet includes many advanced functions if and when you want them without obstructing the simplicity…”

“

Judson Kenoyer, CHP, CIH

“I have used the Monitor 4 in courses that I teach radiation safety for close to 8 years. The students love it and affectionately call it the “Batman unit” because of its use in the movie The Dark Knight Rises. It is light-weight, sensitive, and quite often out performs some of the more expensive units from other companies that we use in a lab exercise…”

“

Neil Breslow, NDT Supply

“NDT Supply has been working with SE International since we started business in 2000. We have found them to be easy to work with, and a very reliable and responsive supplier. Questions and issues are always handled promptly and with a smile…”

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