PTW 60023 Microsilicon Dosimetry Diode

PTW 60023 Microsilicon Dosimetry Diode

 

•           Waterproof silicon diode detector with sensitive volume of only 0.03 mm*

•           Useful for measurements in all electron fields and for photon fields 10 x 10cm²

•           Excellent spatial resolution

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

•           Very small detector to detector variation

•           Excellent dose stability

 

The PTW 60023 microSilicon dosimetry diode is ideal for dose measurements in electron and small photon fields. The excellent spatial resolution makes it possible to measure very precisely beam profiles even in the penumbra region of small fields. The microSilicon is recommended for dose measurements in all electron fields and for photon fields up to 10 x 10cm². The waterproof detector can be used in air and in water.  The microSilicon shows a very small detector to detector variation which provides a sound basis for reliable small field correction factors.

 

Specifications

PlWModel: 60023

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:  0.3 cm³

Design:  waterproof, disk-shaped sensitive volume perpendicular to detector axis

Reference Point:  on chamber axis, 0.9 mm from chamber tip

Direction of Incidence:  axial

Nominal Response:  19 nC/Gy

Dose Stability:  0.5 %/kGy at 10 MeV

1 %/kGy at 21 MeV

0.5 %/kGy at 18 MV

0.1 %/kGy at 6 MV

Temperature Response:  0.1 %/K typical

Energy Response:  at higher depths than dmax, the percentage depth dose curves match curves measured with ionization chambers within ± 0.5%

Detector Bias Voltage:  0V

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, 0.27 mm epoxy

Total window area density:  140 mg/cm²

Water-equivalent window thickness:  1.31 mm

Sensitive Volume:  1 mm² circular, 250 µm thick

 

Outer Dimensions:  diameter 7 mm, length 45.5 mm

 

Useful ranges: 

Radiation quality:  60Co - 6 MV Photons

Field size:  1 x 1 cm² to 10 x 10 cm²

Temperature:  50° - 104° F (10° - 40°C)

Humidity:  10 - 80%, max 20 g/m³

 

*This detector is well suited for measurements in field sizes smaller than 1x1cm². Depending on the accuracy required by the user, correction factors may be necessary as described in international scientific publications. This applies to any detector used in very small fields.

 

Please specify which connection end is needed