Patient QA Solutions
Machine QA Solutions
DosimetrySun Nuclear reference class ionization chambers are optimal tools for scanning, field, and reference dosimetry measurements.
Meet Requirements
Properly QA your linac, in accordance with the reference class and dosimetry protocols of IEC 60731, AAPM TG-51, IAEA TRS-398 and DIN 6800-2.
Reliable & Accurate
Reference-class ion chambers are vented, waterproof and fully guarded. A white chamber body makes visualization easy during setup and relative to cross hairs and lasers.
SNC125c for Reference Class Dosimetry
With a design that reduces the convolution of high-dose gradient regions during profile and depth measurements, SNC125c meets IEC 60731 standards and more:
- Enhanced penumbra without loss of signal strength
- Optimized to work with Sun Nuclear water tanks
- Maintains ideal orientation during scans
- Sensitivity of a 0.125 cm3 chamber and penumbra closer to a micro-chamber
- kq factors available for TG-51, TRS398 and DIN 6800-2 calibrations
SNC350p for Electron Reference Dosimetry
This parallel-plate ion chamber is well-guarded to minimize perturbation effects for reference, field, and scanning dosimetry of therapeutic electron beams, and TDD/TPS commissioning and QA.
- Supports absolute or relative dose point measurements and PDD measurements
- Conforms to the design principles as stated by Dr. M. Roos et al. (IAEA TRS-381)
- Meets AAPM TG‑51 and IAEA TRS‑398 requirements for low‑energy beams (< 10MeV)
- Meets reference-class dosimeter standards of performance (IEC 60731), and may be used to cross calibrate field-class dosimeters
SNC600c for Photon and Electron Reference Dosimetry
SNC600c is a reference class dosimeter based on the classic Farmer Chamber design.
- Reference class performance (IEC 60731)
- Beam quality correction factors (kq) factors available for TG-51, TRS398 and DIN 6800-2 dosimetry protocols
- Classic Farmer Chamber design allows use in most slab phantoms
- White thimble provides easy setup verification
Incorporate these proven chambers into your dosimetry protocols.
The SNC125c has the sensitivity of a 0.125 cm3 penumbra closer to a micro chamber.
6MeV 100 x 100 mm chamber comparison of SNC350p to Roos® Electron Chamber
20 MeV 100 x 100 mm chamber comparison of SNC350p to Roos Electron Chamber
6MV 100 x 100 mm chamber comparison of SNC600c to PTW 30013
18MV 100 x 100 mm chamber comparison of SNC600c to PTW 30013
Monte Carlo calculated beam quality correction factors for two cylindrical ionization chambers in photon beams
M. Alissa, et al, Institute of Medical Physics and Radiation Protection, University of Applied Sciences Giessen (THM), Giessen, Germany; Physica Medica 94 (2022) 17–23
Resources
Publications
- ACPSEM position paper: dosimetry for magnetic resonance imaging linear accelerators
- Lateral dose response of an ionization chamber in an external magnetite field
- Monte Carlo calculated beam quality correction factors for two cylindrical ionization chambers in photon beams
- Report IRS-2066; Monte Carlo calculation of the kQ quality conversion factor for the SNC600c ionization chamber for photon beam reference dosimetry
- Report IRS-2065; Monte Carlo calculation of the kQ quality conversion factor for the SNC600c ionization chamber for electron beam reference dosimetry
- Characterization of a SNC350p parallel-plate ionization chamber for electron beam reference dosimetry National Research Council Canada, Measurement Science and Standards
- MoreLess
Specifications
Active Volume (cm3) |
0.108 |
Active Length (mm) |
7.05 |
Active Diameter (mm) |
4.75 |
Sensitivity (nC/Gy) |
3.4 |
Wall Material |
Paint 0.05 mm |
Electrode |
0.8 mm diameter aluminum |
Vented |
To atmosphere through waterproof tubing |
Waterproofing |
Viton tubing |
Polarizing Voltage |
±400V Max |
Cable Length (m) |
1.5 |
Cable Connector |
TNC or BNC |
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Active Volume (cm3) |
0.6 |
Active Length (mm) |
22.7 |
Active Diameter (mm) |
6.1 |
Sensitivity (nC/Gy) |
20 |
Wall Material (mm) |
Paint 0.05 |
Energy Range |
Co-60 - 25 MV |
Electrode (mm) |
1.1 diameter aluminum |
Vented |
To atmosphere through waterproof tubing |
Waterproofing |
Viton tubing |
Buildup Cap (mm) |
4.5 |
Polarizing Voltage |
±400V Max |
Length (m) |
1.5 |
Cable Connector |
TNC or BNC |
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Sensitive Volume (cm3) |
0.388 |
Entrance Window (mm) |
0.05 Paint |
Reference Point (mm) |
1.0 Below Window Surface |
Collection Volume Height (mm) |
2.0 |
Collector Diameter (mm) |
15.6 |
Guard Ring Width (mm) |
4.1 |
Polarity Effect |
Within 1.000 (±) 0.01 |
Waterproofing |
Viton tubing |
Max Dose Rate for (Gy/s) |
|
≥ 99.5 % Saturation |
5.2 |
≥ 99.0 % Saturation |
10.4 |
Max Dose Per Pulse for (mGy) |
|
≥ 99.5 % Saturation |
0.46 |
≥ 99.0 % Saturation |
0.92 |
Radiation Quality |
Photons: Co-60 to 25 MV |
Field Size (mm) |
Minimum: 40 x 40 |
Sensitive Volume (cm3) |
0.388 |
Entrance Window (mm) |
0.05 Paint |
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