Medical dosimetry services

The Laboratory for Fundamental Medical Dosimetry (LFMD), part of the DTU Dosimetry Reference Laboratory at DTU Health Tech, provides DS/EN ISO/IEC 17025:2017 accredited medical dosimetry services in support of radiotherapy dosimetry.

LFMD offers accredited calibration of ionization chambers and electrometers in accordance with the IAEA TRS-398 Code of Practice or equivalent protocols. The laboratory is accredited by the Danish Accreditation and Metrology Fund (DANAK), with calibration and measurement capabilities (CMC) listed in the DANAK database (accreditation registration no. 266). Ionization chamber calibrations are traceable to PTB (Germany).

Accredited calibration services
The following DS/EN ISO/IEC 17025:2017 accredited calibrations are offered:

• Ionization chamber calibration (absorbed dose to water) in Co-60
  – including measurements of initial recombination and polarity

   

• Ionization chamber calibration (absorbed dose to water) in Co-60 and MV photon beams (4–18 MV)
  – including initial recombination and polarity measurements in Co-60
  – and volume recombination measurements in MV beams

   

• Electrometer calibration (charge)

   

• Electrometer calibration (DC current)

Ionization chamber calibrations are typically organized in two annual calibration sessions, normally in May and November. Customers are encouraged to indicate their interest in advance, as this input supports planning of calibration activities.

Additional (non-accredited) servicesLFMD also offers a range of non-accredited technical services, including:

• Triax cable testing, such as leakage current measurements over a range of applied voltages (e.g. 0 to ±500 V)

   

• System-level testing of customer dosimetry systems (ionization chamber, electrometer and cable) in linac MV photon beams and/or Co-60, benchmarked against DTU reference measurements

System tests may include measurements in conventional MV beams as well as flattening-filter-free (FFF) beams (e.g. 6 MV and 10 MV) to cover a range of clinically relevant dose-per-pulse conditions, supporting verification of electrometer performance under both DC and pulsed irradiation conditions.