Radiation dosimetry

Radiation dosimetry

James Fisher Nuclear offers a comprehensive range of radiation dosimetry and software for the reliable and effective measurement of dose-uptake to personnel and dose in the environment.

Below is a summary of some of the dosimeters James Fisher Nuclear (JFN) can supply to keep your staff safe and make sure you have the does uptake data you need.

Passive dosimeters

A passive dosimeter absorbs radiation over time and can quantify the absorbed dose when it is processed.

Personal alarming dosimeter

The personal alarming dosimeter is designed to be worn on the chest and measure the Hp(10) dose (and in some cases the Hp(0.07) dose) absorbed by the individual. The dosimeter displays the dose and dose rate, and will alarm if pre-set thresholds for either are exceeded. They are used as an operational tool to manage the dose-uptake to individuals both on-the-job and on a day-to-day basis.

Dosimeter readers

Readers are used to communicate with a dosimeter, set up parameters and view dose records. Depending on the system requirements, readers can have a built-in PC or can plug into a computer. They can have a display and push buttons for dialogue, or can simply have LEDs to indicate that a reading has occurred. The readers can be used for access control, and interfaced with body contamination monitors, security gates or turnstiles. The reader might need both a dosimeter and a security badge or a PIN code to allow personnel to pass through the turnstile or security gate.

Dosimetry systems

Personal alarming dosimeters can be operated as standalone devices, but for many applications it is more common to operate them as part of a dosimetry system. Similarly, whilst DIS passive dosimeters can be read on a standalone basis, it is common to network the reader and record the data within a database for subsequent exploitation. To support Rados and MGPI dosimeters, JFN offers a comprehensive range of readers and software to suit the requirements of small and large users.

Dosimetry software

For some system requirements, it is appropriate for dosimeters to be managed with a standalone reader. For many requirements, it is more appropriate to interface the reader to a computer, either directly or through a TCP/IP network. The parameter set-up can be accessed through a maintenance and set-up software utility, and the dose records stored inside the dosimeter downloaded to a database utility.

The system architecture can be as complex or as simple as required by the user and a range of database systems are available to suit small or large users as well as the specific requirements of the emergency services.

It is possible to manage multiple reader types as well as multiple dosimeter types in a single system. Once the data is within a system, it can be used for dose record management, as well as management of dose uptake of individuals and by work area or job code. Systems can support access control to individuals who are allowed into a specific area or to work on a specific job code, and track medical and training records to ensure personnel are suitably qualified. Similarly, the dosimeters themselves can be tracked and alerts given when calibrations are due.


Teledosimeters are personal alarming dosimeters which transmit their data back to a base station in real time, allowing workers operating in remote or challenging environments to be monitored continuously.


Contact Us to find out more about our range of radiation dosimetry instruments and to discuss your requirements.

See the links below for our full suite of radiation protection instrumentation: