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+7 (3412) 60-14-39
Business hours: 8 a.m. to 5 p.m.

Radiascan-701А portable radiation dosimeter

An instrument for radiation hazard warning concerning the surroundings, individual objects, and food items.

Sensor type
Beta 1-1 Geiger–Müller sensor
Dose indication range
0.001 to 1,000 mSv
Dose rate indication range
0.01 to 10,000 µSv/hour
Photon emission energy range
65 to 3,000 keV
Log capacity, records, min.
Power supply via USB
Power cells
2 rechargeable or nonrechargeable AAA batteries
Indication means
Colour OLED display, LEDs, and sound radiator
Operating temperature range
Minus 20 °C to +50 °C
The ST Microelectronics processor based on the ARM Cortex-M3 core

The reliable and affordable RadiaScan 701A dosimeter is intended for domestic needs. This is a modified model that requires no verification and is based on the 801M series. The device is equipped with a Beta 1-1 multisensor, which records and measures alpha, beta, and gamma radiation as well as X-rays.

Instrument complete set

The device is supplied on the market as the following complete set:

  • a dosimeter (dimensions of 11*6*2.3 cm; weight of 0.11 kg);
  • 2 x 1100 mA/hour rechargeable AAA batteries;
  • a cable with a USB connector;
  • an operation manual; and
  • a warranty sheet (1-year service life).

Basic software of the RadiaScan 701A is written by the manufacturer. Buyers can find a current update on the official website.

The 1.8-inch OLED display with resolution of 160*128 provides an angle of view of 170°. The multicolour monitor enables information to be displayed in a user-friendly form. According to customer testimonials, the screen consumes a lot of energy, but it is easier to read information from a large display.

When the natural background is exceeded, the numbers change their colour. Thus, the owner will notice a hazard sooner.

Basic specifications

Technical characteristics of the device are as follows:

  • a measurement range is 0.01 to 10,000 µSv/hour;
  • an integral dose is 0.001 to 1,000 mSv;
  • photon energy is 0.05 to 3.0 MeV;
  • the lower beta-energy limit is no higher than 0.05;
  • a dose threshold is 0.001 to 999.999 mSv.

An ordinary dosimeter is different in an insufficient measurement range. The RadiaScan 701A scanning range is 10 times higher than indications of domestic dosimeters. The results are shown in user-selected units (mSv, roentgen, pulse period, or decay period).

A charged instrument can operate continuously for 59 hours. When used intermittently, the instrument keeps the recharge level for up to 4 weeks. It can be charged through a USB port from the 220 V mains when connected to a PC via a cable. When powered from the mains or an external battery, the operating time is unlimited. A possibility of charging rechargeable batteries from the mains is not provided. While charging, there is no need to take batteries out.

Dosimeter’s advantages

The RadiaScan 701A is used to monitor radiation in stationary conditions. To do so, the dosimeter gets fixed at a specific place (on a window sill/tabletop). An audible signal is generated once the permissible standard is exceeded.

Enthusiasts sometimes manage to record increased radiation at home. It happens because of air mass movements following volcanic eruptions, forest fires, and man-induced incidents. The instrument can be used to monitor contamination of the area, to search for contaminated objects, and to perform other tasks.

The user can carry the device at all times, and there is a carrying case for this purpose (to be purchased separately). This compact instrument can be carried in a pocket, fastened on a belt, or put into a bag. As soon as permissible values are exceeded, it generates an alarm. The owner can either use integrated values or set maximum permissible levels by themselves. The RadiaScan 701A dosimeter can monitor:

  • the condition of work premises, living spaces, public places, soil, water, and air;
  • radiation contaminations of finishing materials (façades cladded with granite/marble) and food;
  • radiation from suspicious objects (antiques, tableware, ceramic items, natural minerals, old clocks).

Radiation-contaminated food items do severe damage to health. One should avoid any contact with objects and people radiating an increased background. Patients undergoing treatment using radioactive iodine-131 or technetium-99 emit radiation that is dangerous to health of people around them. People rub shoulders with them in public transport and on stair landings without knowing about this peculiarity.

Alarm features

The instrument is provided with a function of sound alerting in case when radiation limit rates are exceeded in order to warn the user about the existing hazard. The RadiaScan 701A model allows you to set 2 alarm thresholds—clicks and light indication. In case of a hazard, the instrument activates the alarm to alert people that they must immediately leave the contaminated area.

Possibilities of computer-based control

The device can be connected to a computer using a USB cable and work in the RadiaScan application. The software allows its owner to adjust the instrument with full access to a study log. It opens access to the scanning control, including remote one. This option is necessary in order to prevent the presence of people in the contamination area. The application can be downloaded from the official website of the dosimeter manufacturer.


The RadiaScan 701A model dosimeter is popular not only due to accuracy of results, but also due to convenience of the firmware user interface. Every year sees the release of a few updates, which can be downloaded on the company’s website along with an application installation manual.

Operation mode

The instrument works with all radiation types—alpha, beta, gamma, and X-rays. The dosimeter has 5 scanning options (alpha, beta, gamma, search, and an object radiation study mode). The settings are selected according to the purpose of radiation check.

Main mode

The instrument collects radiation background information on a stationary basis (being fixed outside a window or on a window sill) and on standby. Information can be entered in a special log or transmitted to a PC via a USB cable. Short-time bursts can be recorded so.

The radiation background is thus scanned in a particular area and for a chosen object. The longer time the measurement takes, the more information is gathered, and the higher the accuracy is. It is recommended to reset the counter to zero by pressing the Power button.


Radiation can be found where not expected. Beaches with sand of volcanic origin, granite obelisks in garden squares, marble cladding of organizations’ façadess, and the decoration of private houses may radiate a dangerous background.

The dosimeter will allow you to scan soil and buildings. The radiation search mode operates according to the following scheme. The RadiaScan 701A is set to the Search mode where the device measures a radiation level every 4 seconds.

Herewith, the computational error does not rise, but rather the data is continuously recalculated. It is recommended to use this scanning type at a suggested radiation level above 0.5 µSv/hour. It is optimal for rapid detection of a radiation source on the periphery or among a mass of objects. The dosimeter should be moved gently along the object surface..


This mode is similar to alpha and beta determination modes. First the natural background and then radiation from a specific object are measured. The result is calculated as a difference between these two indicators.

The RadiaScan 701A instrument is the only dosimeter that is capable of evaluating the food contamination degree while issuing the results in an easy-to-understand form. Data about the ambient radiation background is collected on standby.

The Detection mode is required for studying predominantly food items in order to detect dangerous radionuclides in those. In the territory of Russia, there were radioactive emissions that released radiation sources with half-life of hundreds and thousands of years into nature.

When in this mode, the RadiaScan 701A instrument turns on at the set time and studies the background. The results obtained are recorded in the device’s memory. The instrument will turn on automatically even if it is currently in a different mode.

This device can be used to check office and other premises for radioactive gas. Particular attention should be given to water as it may contain radon. A study consists of background and object measurement. The result is displayed as a text: either “background is exceeded” or “normal.” The results obtained are of high accuracy and take a short time period to appear. The measurement accuracy is 1.0 µR/hour or higher.

Alpha and beta particles flux measurement

Two dosimeter modes allow you to study the particle flux density. This option will be useful for professionals and users for periodically measuring the radon content. Objects can accumulate alpha/beta radiation that cannot be removed naturally.

Radioactive gas emits alpha/beta particles, which threatens human health. According to the WHO’s statistics, radon is the second most frequent cause of cancer development. European standards make checks of residential premises for carcinogenic gas mandatory. Radon can be inhaled while being at home, in offices, or in other common premises.

Joint development with Scan-Electronics LLC.