Features
- Vented sensitive volume of 200 cm3
- Makes it possible to measure the source strength of afterloading sources according to AAPM TG-56
- Accommodates suitable applicator adapters for commercial afterloading brachytherapy systems
According to AAPM TG-56, the well-type chamber is required for the source strength measurement of radioactive afterloading sources. The recommended calibration factor is the air kerma strength (cGy m2/h). The PTW calibration certificate also includes factors for apparent activity (GBq or Ci) and exposure strength (R m2/h). Suitable applicator adapters and calibrations are available for the commercial standard afterloading systems. The calibration of the well-type chamber is traceable to NIST, USA, and PTB, Germany. For measurements, the chamber is connected to a sensitive electrometer (e.g. UNIDOS, UNIDOS E, MULTIDOS, TANDEM), which has a reading in pA, a wide dynamic range and an interval time function. The well-type chamber is suitable for the calibration of high dose rate (HDR) and pulsed dose rate (PDR) sources such as 192Ir. Calibrations for low dose rate sources (LDR) such as 137Cs are available upon request.
Specifications
| Type of product | vented well-type chamber |
|---|---|
| Application | calibration of afterloading sources |
| Measuring quantities | air kerma strength, apparent activity, exposure strength |
| Calibration | 192Ir, others upon request |
| Nominal sensitive volume | 200 cm3 |
| Design | vented sensitive volume |
| Reference point | 84.5 mm below chamber top |
| Chamber voltage | 400 V nominal 500 V maximal |
| Change of response with source positioning change of ± 1 cm | < 1 % |
| Leakage current | ≤0.5 pA |
| Measuring range | 1.7 MBq … 8.5 TBq for 192Ir with UNIDOS (the upper limit of the measuring range at 400 V for a saturation of 99.5 % is 4 TBq) |
Measures:
| Inner well diameter | 32 mm |
|---|---|
| Outer dimensions |
height 190.5 mm base diameter 178 mm outer well diameter 93 mm |
| Weight | 2.4 kg |
Useful Ranges
| Temperature | (10 … 40) °C (50 … 104) °F |
|---|---|
| Humidity | (10 … 80) %, max 20 g/m3 |
| Air pressure | (700 … 1060) hPa |
Options
Universal adapters for catheters with diameters between 0.7 and 7.2 mm
Adapter for Nucletron microSelectron afterloaders (type 077.095)
Parts
TN33004 Well-type chamber, connecting system BNT
TW33004 Well-type chamber, connecting system TNC
TM33004 Well-type chamber, connecting system M
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