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PTW 60016 Dosimetry Diode P - Photons

PTW 60016 Dosimetry Diode P - Photons
PTW 60016 Dosimetry Diode P - Photons

Item Number :
300-681

PTW 60016 Dosimetry Diode P - Photons.

Details

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PTW 60016 Dosimetry Diode P - Photons.

The Dosimetry Diode P has been designed for dose measurements in small 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 diode 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 small and large photon fields

• Excellent spatial resolution

• Minimized energy response for field size independent measurements up to 40 cm x 40 cm

The 30016 chamber is used for absolute dose measurements in radiation therapy in cases where the high volume of the 30015 chamber is not needed and a higher spatial resolution is needed.  Correction factors needed to determine absorbed dose to water or air kerma are published in the pertinent dosimetry protocols.  The acrylic chamber wall ensures the ruggedness of the chamber.  The chamber is designed for the use in solid state phantoms and is therefore not waterproof.

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, 2 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 ≤ ± 40°
Leakage Current:  ≤ ± 50 fA
Cable Leakage:
  ≤ 1 pC/(Gy∙cm)

Materials and Measures: 
Entrance window:  1 mm RW3, 1.045 g/cm3 1 mm epoxy
Total window area density:  220 mg/cm2
Water-equivalent window thickness:  2.21 mm
Sensitive Volume:  1 mm2 circular, 30 µm thick

Outer Dimensions:  diameter 7 mm, length 47 mm

Useful ranges: 
Radiation quality:  60Co - 25 MV Photons
Field size:  1 x 1 cm2 to 40 x 40 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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