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Exradin d1h 1400

Machine QA

Exradin® D1H Diode Detector Ideal for in-phantom measurements

The D1H's diode face is perpendicular to the beam when flat, for use inside traditional solid phantoms.

Exradin® D1H Diode Detector part of complete solution for: Annual QA

Diode Type

  • P-type Si diode, unshielded


  • C552 shell for EMI shielding and durability, potted with near-water equivalent epoxy to eliminate air gaps

Outside Diameter

  • D1V (REF 92740): Ø 6.88 mm (0.271”) x 46.2 mm (1.817”) long, D1H (REF 92741): 6.88 mm (0.271”) x 6.88 mm (0.271”) x 34.8 mm (1.37”)

Diameter of Sensitive Area

  • 1 mm2 x ~0.05 mm thick

Effective Depth Below Surface

  • 0.8 mm - Indicator marks or lines clearly identify internal diode orientation and active face

Intended Energy Range

  • Photons: 60Co to 25 MV

Low-Noise Triaxial Cable

  • 50 ohms, 29 pF/ft, 1.5 m long

Connector availability

  • Standard BNC triax, with HV bias capability disabled. Other connector options such as TNC or type M may be available upon request.


  • Yes, may be used in water phantoms, designed to mount cleanly and easily to available chamber holders.

Operating Voltage

  • 0 VDC bias (protected from accidental high voltage application)

Signal Polarity

  • Positive

Radiation response, typ

  • ~5 nC/Gy

Leakage current, typ

  • <100 fA (typical, depends on electrometer used)

Temperature dependence, typ

  • <0.4 % / °C

Sensitivity decrease (at 6 MV)

  • <1.0 % per kGy

Dose to pulse dependency

  • > 99.5% over relevant clinical range

Dose linearity

  • > 99.9%

Field size dependency

  • > 97.0%

Intended Field size for use

  • up to (20 x 20) cm2

Directional Dependence

  • < ± 0.5% tilting ± 20

Operating Parameters

  • Temperature: 15 to 35 °C

Relative Humidity

  • 20 to 80% non-condensing


  • 650 to 770 mmHg


  • -15 to 50 °C

Relative Humidity

  • 10 to 95% non-condensing


  • 600 to 800 mmHg

Product Standards Compliance

  • IEC 60601-11, IEC 607311, WEEE, RoHS




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    Small fields have met their match. The Exradin Scintillators ensure the tightest treatment margins are delivered safely to patients. Discover the advantages of using these detectors that are invisible to the beam and water equivalent.

Tech Notes

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