IONIZATION CHAMBERS
All Radcal ion chambers are designed to provide the user with superior energy response characteristics, unparalleled in the industry. The resulting chamber accuracy and consistent reliability are well documented in the technical literature1-5.
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The Commission of the European Communities undertook what proved to be the largest, most comprehensive intercomparison of diagnostic dose-meters ever done. Our meters, because of their ease of use and linear energy response, were found to provide the users with consistently good results. Please ask us for your free copy. |
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CHAMBERS
Click on each item listed and it will link to the proper specifications.
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| THE
CONNECTOR Radcal hardwires the chamber correction factor in the converter. This provides the user with the chamber interchangeability. |
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THE
CONVERTER
All Radcal chambers come standard with a patented current-to-frequency converter. This minimizes cable noise and ensures a wide dynamic |
CHAMBER OVERVIEW - ROENTGENS
| Sensor |
Rate
Resolution |
Maximum |
Noise |
Dose Resolution |
Maximum |
Leakage |
| 20X6-0.18 | 0.01 R/min | 10 kR/hr | 40 mR/min | 1 mR | 2.4 MR | 0.5 mR/s |
| 20X6-0.6 | 0.01 mR/min | 10 kR/min | 20 mR/min | 0.3 mR | 1.4 MR | 3 mR/s |
| 20X6-6 | 1 mR/min | 1 R/min | 2 mR/min | 0.03 mR | 144 kR | 20 µR/s |
| 20X6-3CT | 1 mR/min | 1 kR/min | 2 mR/min | 0.03 mR | 144 kR | 20 µR/s |
| 20X6-6M | 1 mR/min | 1 kR/min | 2 mR/min | 0.03 mR | 144 kR | 15 µR/s |
| 20X6-60,60E | 0.1 mR/min | 100 R/min | 0.2 mR/min | 3 µR | 14 kR | 2 µR/s |
| 20X6-180 | 1 mR/hr | 1 kR/hr | 2 mR/hr | 1 µR | 2.4 kR | 0.4 µR/s |
| 20X6-1800 | 0.1 mR/hr | 65 R/hr | 0.2 mR/h | 0.1 µR | 240 R | 40 nR/s |
CHAMBER OVERVIEW - GRAYS
| Sensor |
Rate
Resolution |
Maximum |
Noise |
Dose Resolution |
Maximum |
Leakage |
| 20X6-0.18 | 1 µGy/s | 1.5 Gy/s | 4 µGy/ | 5 µGy | 21 kGy | 3 µGy/s |
| 20X6-0.6 | 1 µGy/s | 1.5 Gy/s | 2 µGy/s | 0.1 ”Gy | 12 kGy | 2 µGy/s |
| 20X6-6 | 0.1 µGy/s | 150 mGy/s | 0.4 µGy/s | 0.3 µGy | 1.2 kGy | 0.2 µGy/s |
| 20X6-3CT | 0.1 µGy/s | 150 mGy/s | 0.4 µGy/s | 0.3 µGy | 1.2 kGy | 0.2µGy/s |
| 20X6-6M | 0.1 µGy/s | 150 mGy/s | 0.2 µGy/s | 0.3 µGy | 1.2 kGy | 0.2 µGy/s |
| 20X6-60,60E | 0.01 µGy/s | 15 mGy/s | 0.02 µGy/s | 0.03 µGy | 120 Gy | 15 nGy/s |
| 20X6-180 | 0.01 mGy/hr | 8.8 Gy/hr | 20 µGy/hr | 5 nGy | 21 Gy | 4 nGy/s |
| 20X6-1800 | 1 µGy/hr | 570 mGy/hr | 2 µGy/hr | 0.5 nGy | 2.1 Gy | 0.4nGy/s |
The dynamic range and thin profile of these chambers make them ideal for virtually all X-ray service applications (make sure the beam size is larger than the size of the detector):
Additionally, the -60E(xtended) chamber's increased sensitivity at lower energies turns the chamber into a "Universal" detector, covering mammography through R&F and beyond.
The 8231 holder is recommended (please see accessories).
SPECIFICATIONS
| Rate Specifications: | 0.1
mR/min - 100 R/min 0.01 µGy/s - 15 mGy/s |
| Exposure Specifications: | 3
µR - 14 kR 0.03 µGy - 120 Gy |
| Calibration Accuracy (-60): | ±4% using X-rays @ 150 kVp & 10.2 mm Al HVL |
| Calibration Accuracy (-60E): | ±4% using X-rays @ 50 kVp & 0.88 mm Al HVL |
| Exposure Rate Dependence: | ±5%, 2 mR/min to 199 R/min |
| Energy Dependence (-60): | ±5%, 20 keV to 1.33 MeV(with build-up material) |
| Energy Dependence (-60E): | ±5%, 0 .2mm AL HVL to 1.33 MeV (with build-up material) |
| Construction: | Polycarbonate walls; conductive graphite exterior coating; 60 cm3 active volume, 3 m low-noise triax cable; 0.32 kg |
20X6-6
GENERAL PURPOSE, IN BEAM CHAMBER
The 20X6-6 chamber permits in-beam measurements as described in "Routine Compliance Testing for Diagnostic x-ray systems" (PB89-205215). The 20A5 adapter is required when using the BRH geometry (the 10T5 test stand).
SPECIFICATIONS
| Rate Specifications |
1 mR/min - 1 kR/min 0.1 µGy/s - 150 mGy/s |
| Exposure Specifications |
0.03 mR - 144 kR 0.3 µGy - 1.2 kGy |
| Calibration Accuracy: | ±4% using X-rays @ 150 kVp & 10.2 mm Al HVL |
| Exposure Rate Dependence: | ±5%, 0.02 to 1000 R/min, up to 500R/s for 10 ms pulses |
| Energy Dependence | ±5%, 30 keV to 1.33 MeV (with build-up material) |
| Construction: | Polycarbonate walls and electrode conductive graphite interior coating; 6 cm3 active volume; 0.3 kg |
20X6-6M
DEDICATED MAMMOGRAPHY CHAMBER
Long before the Mammography Quality Assurance Standards Act, Radcal designed what proved to be one of the finest low energy chambers on the market. It's extraordinary flat energy response over the 10 - 40 keV has been documented in technical papers 2,3 and makes corrections unnecessary. Unlike solid state detectors, the -6M's response is not influenced by tube target material or filtration.
SPECIFICATIONS
| Rate Specifications: | 1
mR/min - 1 kR/min 0.1 µGy/s - 150 mGy/s |
| Exposure Specifications: | 0.03
mR - 144 kR 0.3 µGy - 1.2 kGy |
| Calibration Accuracy: | ±4% using X-rays @ 20 kVp & 0.26 mm Al HVL |
| Exposure Rate Dependence | ±5%, 0.02 to 1000 R/min |
| Energy Dependence: | ±5%, 10 keV to 40 keV |
| Construction: | 0.7 mg/cm2 metalized polyester window; polyacetal exterior; 6 cm3 active volume; 0.32 kg |
20X6-180
LEAKAGE AND LOW LEVEL MEASUREMENTS CHAMBER
The 20X6-180 ion chamber is designed for leakage measurements as described in "Regulations for the Administration and Enforcement of The Radiation Control for Health and Safety Act of 1968" (HHS Publication FDA 88-8035), and provides the required effective cross-section of 100 cm2.
SPECIFICATIONS
| Rate Specifications: |
0.1 mR/hr - 65 R/hr 1 µGy/hr - 570 mGy/hr |
| Exposure Specifications: |
0.1 µR - 240 R 0.5 nGy - 2.1 Gy |
| Calibration Accuracy: | ±4% using X-rays @ 150 kVp & 10.2 mm Al HVL |
| Exposure Rate Dependence | ±5%, 0.1 mR/hr to 20R/hr, -10% to 65 R/hr |
| Energy Dependence: | ±5%, 33 keV to 1.33 MeV (with build-up material) |
| Construction: | Polycarbonate walls and electrode; conducting graphite exterior coating; 180 cm3 active volume; 0.88 kg |
20X6-1800
RADIATION PROTECTION CHAMBER
The 20X6-1800 ionization chamber is intended for low-level radiation measurements such as shielding leakage, irradiator and environmental. Unlike typical survey meters, the 20X6-1800 chamber offers improved accuracy over a wider dynamic range.
SPECIFICATIONS
| Rate Specifications: | 0.1
mR/hr - 65 R/hr 1 µGy/hr - 570 mGy/hr |
| Exposure Specifications: | 0.1
µR - 240 R 0.5 nGy - 2.1 Gy |
| Calibration Accuracy: | ±4% using X-rays @ 150 kVp & 10.2 mm Al HVL |
| Exposure Rate Dependence | ±5%, 0.1 mR/hr to 20R/hr, -10% to 65 R/hr |
| Energy Dependence: | ±5%, 33 keV to 1.33 MeV |
| Construction: | Polycarbonate walls and electrode; conducting graphite exterior coating; 1800 cm3 active volume; 0.88 kg |
20X6-3CT
COMPUTED TOMOGRAPHY CHAMBER FOR CTDI
When used in conjunction with Radcal's 20CT6 (head phantom) and Radcal's 20CT14 (body phantom) the 20x6-3CT permits evaluation of the radiation output as prescribed by HHS publication FDA 88-8035. It's excellent energy, partial volume response and position uniformity has been well documented 4,5.
SPECIFICATIONS
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| Rate Specifications: | 1
mR/min - 1 kR/min 0.1 µGy/min - 150 Gy/min |
| Exposure Specifications: | 0.03
µR - 144 kR 0.3 µGy - 1.2 kGy |
| Calibration Accuracy: | ±4% using X-rays @ 150 kVp and 10.2 mm Al HVL |
| Exposure Rate Dependence | ±2%, 2 mR/s to 40 R/s |
| Energy Dependence: | ±5%, 3 - 20 mm Al HV |
| Uniformity Along Length & Partial Volume Response | ±5%, to within 0.25 cm of chamber ends for a constant volume slice |
| Construction: | C552 air-equivalent walls and electrode; polyacetal exterior cap; 3 cm3 active volume; 2 m, low-noise triax cable; 0.3 kg |
2OX6-0.6
THERAPY QA CHAMBER
This high dose rate chamber provides an excellent response at therapy and other high energy, high dose rate applications. The fully guarded chamber is mounted at the end of a 12 m low noise triax cable.
SPECIFICATIONS
| Rate Specifications: | 0.01
mR/min - 10 kR/min 1 µGy/min - 1.5 Gy/min |
| Exposure Specifications: | 0.3
mR - 1.4 MR 3 µGy - 12 kGy |
| Calibration Accuracy: | ±3% using 60Co |
| Exposure Rate Dependence | ±5%, 0.6 R/min to 6 kR/min |
| Energy Dependence: | ±5%, 40 keV to 1.33 MeV (with build-up cap) |
| Construction: | C552 air-equivalent material & electrode; polyacetal exterior cap; 0.6 cm3 active volume; 12 m, low-noise triax cable; 0.48 kg |
20X6-0.18
HIGH DOSE-RATE CHAMBER
The 20X6-0.18 ion chamber is intended for in-beam measurements of high-intensity gamma radiation. It is suitable for cavity gamma irradiators as well as beam type irradiators. The fully guarded chamber is mounted at the end of a 3 meter, low-noise triax cable.
SPECIFICATIONS
| Rate Specifications: | 0.02
R/min - 10 kR/min 3uGy/sec - 1.5 Gy/sec |
| Exposure Specifications: | 1
mR - 2.4 MR 5 µGy - 21 kGy |
| Calibration Accuracy: | ±4% using 60Co |
| Exposure Rate Dependence | ±2%, 10 R/hr to 650 kR/hr Energy Dependence: |
| Energy Dependence: | ±5%, 45 keV to 1.33 MeV |
| Construction: | C552 air-equivalent walls & electrode; polyacetal exterior cap; 0.18 cm3 active volume; 3 m, low-noise triax cable; 0.3 kg |
ACCESSORIES
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25A26
Adapter This 1ft adapter allows the use of 20X5 series chambers with the 2026C. 20X5 series chambers calibrated for Gray need to either be re-calibrated for R (please contact us), or the reading will need to be corrected for manually. |
| 20C6-7
Cable The 2026C comes with a 7.4m cable. The 20C6-7 cable is 7.4 m (20 ft) in length. Contact Radcal forinformation about longer cables. |
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Radiation Protection Dosimetry, Volume 43, No. 1/4, Studies On the Performance of Diagnostic Air Kerma Meters in the US, L.K. Wagner
Radiation Protection Dosimetry, Volume 43, No. 1/4, Diagnostic Dosimeter Intercomparison, Commission of European Communities
Medical Physics, 17(6), Nov/Dec 90, On the measurement of HVL in Film Screen Mammography, L. Wagner, F. Cerra, B. Archer
Health Physics Journal, Vol 37 (Dec), pp. 773-774, Evaluation of the MDH Industries, Inc, Pencil Chamber for Direct Beam CT Measurements, William Pavlicek, John Horton, Robert Turco
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