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PTW 60018, Dosimetry Diode SRS

PTW 60018, Dosimetry Diode SRS

Item Number :
300-688

PTW 60018, Dosimetry Diode SRS.

Details

PTW 60018, Dosimetry Diode SRS.

 

The 60018 Dosimetry Diode SRS is ideal for dose measurements in photon fields with a maximum field size of 10 cm x 10 cm and with a maximum energy of 6 MV. The very high response of this detector allows to measure beam profiles with a very high resolution and very short dwell time. The Diode SRS is thus typically used for beam profile measurements in stereotactic radiosurgery (SRS).

Features

• Waterproof, disk-shaped silicon diode detector with sensitive volume of only 0.3 mm³

• Designed for dose measurements in small photon fields with a maximum energy of 6 MV and up to a field size of 10 cm x 10 cm

• Excellent spatial resolution

• High response, very low noise

•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:  0.3 cm3
Design:  waterproof, disk-shaped sensitive volume perpendicular to detector axis
Reference Point:  on detector axis, 0.74 mm from detector tip
Direction of Incidence:  axial
Nominal Response:  175 nC/Gy
Dose Stability:  ≤ 0.8% kGy at 6 MV
Temperature Response:  ≤ 0.1 ± 0.05% 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, 0.4 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

 

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Data Sheet

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