Features
- Very small sensitive volume of 1 to 6 mm3 and typically 0.3 mm thickness
- Good tissue-equivalence
- Suitable for dose scanning in IMRT and stereotactic fields because of its excellent spatial resolution
The Diamond Detector, based on a naturally grown diamond, is a nearly tissue-equivalent radiation detector. It is designed for dose distribution measurements in high-energy photon and electron beams, featuring a favorable signal-to-noise ratio. Because of its small sensitive volume, the detector is applied for IMRT, stereotactic beams, brachytherapy and water phantom scanning, and is especially well suited for beams with very small field sizes or steep fluence gradients. The Diamond Detector responds with an excellent spatial resolution, low energy and temperature dependence, high sensitivity, nearly no directional dependence and high resistance to radiation damage. The cable length is 1.5 m.
Specifications
| Type of product | diamond detector |
|---|---|
| Application | dosimetry in radiotherapy beams |
| Measuring quantity |
absorbed dose to water |
| Reference radiation quality | 60Co |
| Nominal sensitive volume | (1 … 6) mm3 |
| Design | waterproof, disk-shaped sensitive volume perpendicular to detector axis |
| Reference point | on detector axis, 1 mm from detector tip |
| Nominal response | (50 … 500) nC/Gy |
| Energy response | at higher depths than dmax, the percentage depth dose curves match curves measured with ionization chambers within ± 0.5 % |
| Detector bias voltage | + 100 V (± 1 %) |
| Directional response | < ± 2 % for tilting < ± 170° |
| Leakage current | < 5 pA |
| Cable leakage | < 1 pC/(Gycm) |
| Charge collection time | ≤ 10 ns |
Measures:
| Sensitive area | (3 … 15) mm2 |
|---|---|
| Thickness of sensitive area | (0.1 … 0.4) mm |
| Water-equivalent window thickness | 1.15 mm |
| Sensitive volume |
radius 0.56 mm depth 2.5 µm |
| Outer dimensions | diameter 7.3 mm |
Useful Ranges
| Dose rate | (0.05 … 30) Gy/min |
|---|---|
| Radiation quality |
80 keV … 20 MV photons
(4 … 20) MeV electrons |
| Temperature |
(10 … 40) °C (50 … 104) °F |
| Humidity | (10 … 80) %, max 20 g/m3 |
| Air pressure | (700 … 1060) hPa |
Parts
TM60003 Diamond Detector, connecting system M, cable length 1.5 m
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