PTW designs, develops, manufactures and distributes high quality dosimetry and Quality Control equipment mainly for use in the medical field, especially in radiation therapy, diagnostic radiology and nuclear medicine. Des......PTW designs, develops, manufactures and distributes high quality dosimetry and Quality Control equipment mainly for use in the medical field, especially in radiation therapy, diagnostic radiology and nuclear medicine. Design and production of mechanical, electronic and software components are all done in house. We operate a well-equipped and modern workshop with 6 CNC machines. Our products, especially the PTW ionization chambers and electrometers, are well known throughout the world and are recognized for their workmanship and high level of quality. PTW is the market leader in its major product lines. The PTW distribution is organized internationally. A number of exclusive PTW representations are established in many countries around the world. In 1995, PTW New York Corporation was established to improve our service to customers in America and to distribute and service PTW products all over the American continent. In January 2002, PTW-France was established to support the French market. In the years 2004 and 2005 PTW-Asia Pacific and PTW-Latin America have followed. In June 2007, PTW-Beijing has been founded. PTW-Freiburg operates Germanys first Secondary Standard Dosimetry Laboratory for radiation quantities accredited by the DKD German Calibration Service, under direct supervision of the National Laboratory. It operates as an ADCL (Accredited Dosimetry Calibration Laboratory) and it is also a member of the international SSDL network, organized by the International Atomic Energy Agency IAEA. We perform radiological calibrations for dosemeters used in radiation therapy, diagnostic radiology and health physics, which are directly traceable to the primary standard. Our calibration lab provides a complete range of radiological calibrations from low X-ray energies up to 60Co and from low to high dose rates and is one of the busiest calibration labs worldwide. We cooperate closely with official public agencies worldwide, and we participate actively in national and international work groups for the standardization of devices and procedures for dose measurement and quality control in medical radiology.