Exradin® Diodes

Micro field measurements

Exradin diodes 1400

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Exradin diodes 1400

The Exradin® Advantage

Higher signal, flatter profiles and sharper resolution with a smaller active measurement. Precise measurement of minute fields with high visibility of the penumbra.

Minimize Angular Dependence

Exradin diodes have less than 0.5% angular dependence when tilted up to 20°, providing more confidence when measuring the penumbra or edge of the beam.

Specialized for Small Fields

The D1V's diode face is perpendicular to the beam when upright, making it ideal for photon scanning applications and use in water phantoms and the Lucy 3D QA Phantom. The D1H's diode face is perpendicular to the beam when flat, for use inside traditional solid phantoms. Both diodes provide superior measurement of field sizes up to 20 x 20 cm2 with excellent spatial resolution and minimal noise.

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Specifications

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Diode Type
P-type Si diode, unshielded
Materials
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.
Waterproof
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
Pressure
650 to 770 mmHg
Temperature
-15 to 50 °C
Relative Humidity
10 to 95% non-condensing
Pressure
600 to 800 mmHg
Product Standards Compliance
IEC 60601-11, IEC 607311, WEEE, RoHS
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