Working Principle: Electro-Mechanics

The Hammer dosemeter was the first therapy dosemeter to measure the radiation output of therapeutic X-ray units. It was based on electrostatic relay, a revolutionary new electromechanical component for measuring very small electrical charges of irradiated ionization chambers. 

• The same year 1922, Radiation Oncology was introduced as a medical discipline.

Working Principle: Electron Tubes

The SIMPLEX and DUPLEX dosemeters represented the second generation of therapy dosemeters based on electron tube technology and used for single and dual channel absolute dosimetry of radiotherapy beams.

• At that time new treatment devices with higher energy beams were already in use, such as Cobalt units and Betatrons. In 1953 the first clinical linear accelerators went into operation.

Working Principle: Transistors

Various types of DOSIMENTOR dosemeters (DL4, DI4, SN4, IQ4) were introduced in 1977 based on transistor technology resulting in higher accuracy, sensitivity and long term stability. The DOSIMENTOR was officially type tested and grew to the standard therapy dosemeter internationally.

• New generations of linear accelerators with high energy photon and electron beams are introduced.

Working Principle: Integrated Circuits      

UNIDOS represents a new class of therapy dosemeters with entirely digital concept based on integrated electronic circuits and supplied with an LCD display and an RS232 interface. The high performance provides superior resolution, accuracy and stability and makes this reference class dosemeter a standard.

• The former analog linear accelerators are replaced by modern digitally controlled treatment devices.

Working Principle: Digital Network Technology

UNIDOS webline sets another milestone in therapy dosimetry. Its high-precision secondary standard reference class performance is combined with modern network features. The TCP/IP Ethernet interface makes it possible to integrate the device in a LAN for remote access.

• Advanced radiotherapy systems with tumor specific IMRT treatment techniques are introduced into routine work.