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PTW 60017 Dosimetry Diode E - Photon, Electron

PTW 60017 Dosimetry Diode E - Photon, Electron
PTW 60017 Dosimetry Diode E - Photon, Electron

Item Number :
300-682

PTW 60017 Dosimetry Diode E - Photon / Electron.

Details

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PTW 60017 Dosimetry Diode E - Photon / Electron.

The Dosimetry Diode E has been designed for dose measurements in small electron and photon fields as encountered in IORT, IMRT and stereotactic beams.  Its excellent spatial resolution allows for very precise beam profile measurements even in the penumbra region of small fields.  Due to its superior energy response accurate percentage depth dose (PDD), measurements can be performed which are field size independent up to field sizes of 40 x 40 cm.  The waterproof detector can be used in air, solid state phantoms and in water.

• Waterproof, disk-shaped silicon diode detector with sensitive volume of only 0.03 mm³

• Useful for measurements in all electron fields and for small photon fields

• Excellent spatial resolution

• Minimized energy response

• Thin entrance window for measurements in the vicinity of surfaces and interfaces

Specifications
Type of Product:  p-type silicon diode
Application:  dosimetry in radiotherapy beams
Measuring Quantities:  absorbed dose to water
Reference Radiation Quality:  60Co
Nominal Sensitive Volume:  0.03 cm3
Design:  waterproof, disk-shaped sensitive volume perpendicular to detector axis
Reference Point:  on detector axis, 0.77 mm from detector tip
Direction of Incidence:  axial
Nominal Response:  9 nC/Gy
Dose Stability:  ≤ 0.5% kGy at 6 MV, ≤ 1% kGy at 15 MV, ≤ 0.5% kGy at 5 MeV, ≤ 4% kGy at 21 MeV
Temperature Response:  ≤ 4% K
Energy Response:  at higher depths than dmax, the percentage depth dose curves match curves measured with ionization chambers within ± 0.5%
Detector Bias Voltage:  0 V
Signal Polarity:  negative
Directional Response in Water:  ≤ ± 0.5 % for rotation around the chamber axis, ≤ ± 1% for tilting ≤ ± 20°
Leakage Current:  ≤ ± 50 fA
Cable Leakage:  ≤ 1 pC/(Gy∙cm)

Materials and Measures: 
Entrance window:  0.3 mm RW3, 1.045 g/cm3 0.4 mm epoxy
Total window area density:  140 mg/cm2
Water-equivalent window thickness:  1.33 mm
Sensitive Volume:  1 mm2 circular, 30 µm thick

Outer Dimensions:  diameter 7 mm, length 45.5 mm

Useful ranges: 
Radiation quality:  6 – 25 MeV electrons, 60Co - 25 MV Photons
Field size:  1 x 1 cm2 to 40 x 40 cm2, 1 x 1 cm2 to 10 x 10 cm2
Temperature:  50° - 104° F (10° - 40°C)
Humidity:  10 - 80 %, max 20 g/m3


Data Sheet

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