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This section provides an overview for geiger counters as well as their applications and principles. Also, please take a look at the list of 6 geiger counter manufacturers and their company rankings. Here are the top-ranked geiger counter companies as of June, 2026: 1.Vedantu Innovations Pvt. Ltd., 2.Ludlum Measurements, Inc., 3.International Medcom.
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A Geiger counter is one of the radiation measuring instruments used to determine the amount of radiation present on the surface of a material or in a space.
It is also referred to as a Geiger-Muller counter tube or GM counter tube, named after its creators, Geiger and Muller. A Geiger counter is a type of survey meter that contains a metal, gas-filled cylinder called a GM tube.
Due to its simple structure, it is available at a relatively low price. They are widely used from public facilities such as electronic power generation facilities, police stations, and hospitals to individuals.
Geiger counters are used to measure radiation levels in space and materials. Radiation is used not only in the medical and industrial fields, but also in the agricultural field.
The simple measurement of radiation levels makes it possible to check food surfaces for contamination and to measure a wide variety of samples, including soil, water, and air doses. Although the Geiger counter is a very simple device, it is not a panacea for radiation measurement. Thus, it is necessary to understand the object to be measured and to measure it correctly.
A Geiger counter is a cylindrical electrode called a GM tube filled with inert gases such as argon and helium. It measures the radiation dose by detecting the discharge (pulse) that occurs when radiation passes through the tube.
The measurement results are displayed in units of microsieverts per hour (μSv/h). A microsievert per hour is the amount of radiation you would receive if you were in a certain location for one hour. Radiation is the electromagnetic waves or particle rays produced when radioactive materials decay. Some radiation can penetrate the human body.
A particularly large number of gamma rays, which have a high penetrating power, affect the human body when their energy is high. The unit for this effect is the sievert (Sv). A sievert is defined as the number of gamma rays absorbed by the human body x energy. A Geiger counter measures the number of radiation rays present inside the device. The measured radiation counts per unit of time (cpm: counts per minute) are multiplied by a constant and converted to microsieverts per hour.
There are two main types of Geiger counters:
This type of Geiger counter is a cylindrical container made of glass or metal with a counting gas sealed inside. This type of Geiger counter is used to measure gamma radiation doses.
One end of the Geiger-Mueller counter is made of a thin film, and there is a window made of mica, an ore called mica window, through which radiation reaches the boundary surface. It measures the number of beta rays entering through the mica window and is used to investigate contamination by radioactive materials.
A Geiger counter is properly a radiation measuring instrument using a Geiger-Mueller counter. However, radiation measuring instruments with different measuring principles, called scintillation type or semiconductor type, are also sometimes called Geiger counters.
Geiger counters are simple in construction and easy to handle, but care must be taken in handling the measurement results. It is important to understand that the measurement results of a Geiger counter are highly variable.
Radiation is randomly emitted from a radioactive material, so the measurement results can vary. Due to the randomness of the radiation emitted, even a change in the direction of the Geiger counter in the same location can change the measurement results. When measuring radiation levels with a Geiger counter, it is important to orient the Geiger counter and repeat the measurement multiple times before taking an average reading.
Also, if the Geiger counter is contaminated with radioactive materials, it will not give correct results. It is important to handle the Geiger counter in such a way that it does not get dirty.
*Including some distributors, etc.
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Ludlum Measurements, Inc., founded in Sweetwater, TX in 1962 is a manufacturer of radiation detection instruments and technologies. The company's product portfolio includes Portable Survey Meters, Personal Radiation Meters, Benchtop Meters, Scalers / Counters and Pulsers. Their products are used are in applications such as routine personnel and material monitoring, border security, and emergency response situations. The company serves markets including Medical and Healthcare, Aerospace and Defense, Consumer Goods, Industrial Manufacturing and Construction and Building. The company also offers services including service repair and calibration, Training Courses, and a full list of product videos.
International Medcom is a manufacturer of radiation detection instruments and systems established in 1986 and based in Sebastopol, California. Its manufactured products are Geiger counters, environmental monitoring systems, nano kits, and radius radiation probes. It also manufactures hand-held radiation detectors, such as IMI inspector alerts and hawk radius probes. Each of its products is in compliance with RoHS standards and caters to the fire safety, industrial, laboratory, and radiation research sectors across the USA. The company is accredited by BBB Rating & Accreditation and has obtained several ISO certifications, namely ISO 14001 and ISO 9001:2000 certifications.
PASCO Scientific, headquartered in the United States, is a supplier company of educational science solutions since 1964. The company's comprehensive product range includes science sensors, data loggers, and lab equipment, catering to different educational levels from K-12 to higher education. Hands-on science tools and datalogging solutions connect the students directly to science and STEM concepts with classroom technology such as sensors, interfaces, and data collection and analysis software. They also design and manufacture lab equipment for physics and engineering and offer curriculum solutions.
Ranking as of June 2026
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Vedantu Innovations Pvt. Ltd. |
24.2%
|
| 2 | Ludlum Measurements, Inc. |
24.0%
|
| 3 | International Medcom |
14.0%
|
| 4 | AZoSensors |
8.4%
|
| 5 | Scorpio Technology Vic. Pty. Ltd. |
8.0%
|
| 6 | PASCO |
7.7%
|
| 7 | ADM Systems Group |
7.5%
|
| 8 | SOMATCO |
6.1%
|
Derivation Method
The ranking is calculated based on the click share within the geiger counter page as of June 2026. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
2 | 40.0% |
|
Australia
|
1 | 20.0% |
|
United Kingdom
|
1 | 20.0% |
|
India
|
1 | 20.0% |
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