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flashDiamond Detector

The New Single Crystal Diamond Detector for FLASH Dosimetry

The Detector for FLASH Dosimetry Needs

Real-time dosimetry of ultra-high dose rate (UHDR) as currently used for the investigation of the so-called FLASH effect is particularly challenging. Until now, commercially available detectors typically used in conventional radiotherapy have not been suitable for FLASH dosimetry due to recombination, saturation, or nonlinearity effects.

The new PTW flashDiamond detector, which was developed in cooperation with the University of Rome “Tor Vergata”, has been successfully tested for relative dosimetry in UHDR conditions, but is also a promising candidate for reference dosimetry.

 
PTW flashDiamond at Heidelberg University Hospital
Photo: Courtesy of University Hospital Heidelberg

flashDiamond* for Relative and Reference Dosimetry

PTW flashDiamond and UNIDOS

 

The flashDiamond uses the same technology as the well-established microDiamond detector, but has been optimized to meet the specific demands of FLASH radiation. Its superior performance characteristics, proven through extensive testing at various UHDR linacs, make it an ideal detector for a wide range of UHDR applications.

The detector has been successfully used for relative 3D dose distribution measurements in UHDR beams without the need for correction factors and is also potentially suitable for use in reference dosimetry. Combined with the optional flashAdapter, the flashDiamond is compatible with PTW electrometers and water phantoms for precise dose measurements.

Highlights

  • Excellent radiation hardness
  • High spatial and temporal resolution
  • Nearly water equivalent for all beam energies
  • Minimal energy, temperature and directional dependence
  • Very good linearity up to 8 Gy/pulse at a pulse length of 4 μs
  • Suitable for field sizes of 1 cm x 1 cm ... 20 cm x 20 cm
  • Nominal active diameter 1.2 mm
  • Axial or radial direction of incidence

 

*for research use only

Publication Highlight:

“Metrology for advanced radiotherapy using particle beams with ultra-high dose rates”

Interested in an update in FLASH dosimetry? Read the comprehensive report by Anna Subiel et al 2024 Phys. Med. Biol. 69 14TR01 which summarizes the results of the European UHDpulse project and other initiatives aiming to support the safe translation of FLASH-RT into clinical practice. The article reviews recent developments in FLASH dosimetry, focusing on primary and secondary standard instruments, which also include PTW detector developments.

Download topical review (open access)

Publication Highlight: “Metrology for advanced radiotherapy using particle beams with ultra-high dose rates”

Selected Publications

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