REFERENCE CLASS CHAMBERS

Reference Class Chambers are designed to be used by calibration laboratories that employ reference grade electrometers and bias supplies.

Click Chamber Images for Energy Dependence Charts and Schematic Drawings

Click here for Nominal Chamber Volumes and Sensitivity Chart below

Click here for Disconnect Cable Length and Electrometer Termination

RC6
General Purpose X-Ray Measurements

The RC6 is an unsealed cylindrical 6 cm3, general-purpose ion chamber, designed for general purpose x-ray measurements. It has excellent energy response throughout the diagnostic energy range and with an appropriate build-up cap (optional), the energy range can be extended to 60Co.

Exposure Rate Dependence:   <5% to 150 mGy/s, up to 4 Gy/s for 10 ms pulses
     
Energy Dependence:   ±5%, 30 keV to 1.33 MeV (with build-up material)
     
Bias:       Nominal +300 VDC (max +600 VDC)
     
Electrical Leakage:   <5e-15 A with +300 VDC bias
     
Construction:  
Guarded (3-terminal) concentric cylinder with polycarbonate walls and conducting graphite interior coating. Nominal 6 cm3 active volume; 0.05 kg  

 

 

 

 

 

 

 

 

RC6M
Low Energy X-Ray Measurements
The RC6M is an unsealed parallel plate 6 cm3 ion chamber specifically designed for low-energy x-ray measurements. It has a thin entrance window and is suitable for x-ray energies in the range of 10 to 40 keV.

Exposure Rate Dependence:   <5% to 90 mGy/s
     
Energy Dependence:   ±5%, 10 keV to 40 keV
     
Bias:   Nominal +300 VDC (max +600 VDC)
     
Electrical Leakage:   <5e-15 A with +300 VDC bias
     
Construction:  
Guarded (3-terminal) parallel plate, with 0.7mg/cm2 metalized polyester window; polyacetal exterior; nominal 6 cm3 active volume; 0.08 kg

                  

 

 

 

 

 

RC60
X-Ray Beam Measurements

The RC60 is an unsealed thin cross-section, parallel plate 60 cm3 ion chamber suitable for x-ray beam measurements with low to intermediate dose rates. It has excellent energy response throughout the diagnostic energy range and with the application of appropriate build-up materials, the energy range can be extended to 60Co.

Exposure Rate Dependence:   <5% to 30 mGy/s
     
Energy Dependence:   ±5%, 30 keV to 1.33 MeV (with build-up material)
     
Bias:   Nominal +300 VDC (max +600 VDC)
     
Electrical Leakage:   <5e-15 A with +300 VDC bias
     

Construction:





 
Guarded (3-terminal) parallel plate, with polycarbonate walls; conductive graphite interior and exterior coating; nominal 60 cm3 active volume, 0.5 m low-noise triax cable; 0.13 kg.
Note: The chamber assembly shown in the image depicts the chamber with the Radcal Model 8230M chamber support, optional, ordered separately.

 

 

 

 

RC3CT
CT X-Ray Beam Measurements
The RC3CT is an unsealed cylindrical, 10 cm pencil ion chamber with a 3 cm3 volume. It is designed specifically for CT x-ray beam measurements, either free-in-air or mounted in a head or body phantom. It has excellent energy and partial volume response along its entire 10 cm length.

Exposure Rate Dependence:   <5% to 350 mGy/s
     
Energy Dependence:   ±5%, 3-20 mm Al hvl
     
Bias:   Nominal +300 VDC (max +600 VDC)
     
Electrical Leakage:   <5e-15 A with +300 VDC bias
     
Construction:  
Guarded (3-terminal) 10 cm long cylindrical, with C552 air-equivalent walls and electrode; polyacetal exterior cap; nominal 3 cm3 active volume; 0.5 m, low-noise triax cable; 0.11 kg

 

 

 

 

RC180
Low Dose Rate X-Ray Beam or Scatter Measurements

The RC180 is an unsealed parallel plate 180 cm3 ion chamber suitable for low dose rate x-ray beam or scatter measurements. It has an effective cross section of 100 cm3 and has excellent energy response throughout the diagnostic energy range. With the application of appropriate build-up materials, the energy range can be extended to 60Co.

Exposure Rate Dependence:   <5% to 5 mGy/s
     
Energy Dependence:   ±5%, 33 keV to 1.33 MeV (with build-up material)
     
Bias:   Nominal +300 VDC (max +600 VDC)
     
Electrical Leakage:   <5e-15 A with +300 VDC bias
     
Construction:  
Guarded (3-terminal) parallel plate, with polycarbonate walls and electrode; conducting graphite interior and exterior coating; nominal 180 cm3 active volume; 0.11 kg

 

 

 

 

RC1800
Low Dose Rate Radiation Applications
The RC1800 is an unsealed cylindrical 1800 cm3 ionization chamber intended for low dose rate radiation applications such as shielding leakage, low-level irradiator output and environmental measurements.

Exposure Rate Dependence:   <5% to 50 uGy/s, <10% to 160 uGy/s (bias +300 VDC)
     
Energy Dependence:   ±5%, 33 keV to 1.33 MeV
     
Bias:   Nominal +300 VDC (max +600 VDC)
     
Electrical Leakage:   <1e-14 A with +300 VDC bias
     
Construction:  
Guarded (3-terminal) parallel plate, polycarbonate walls and electrode; conducting graphite interior and exterior coating; 1800 cm3 active volume; 0.54 kg

 

 

 

Nominal Chamber Volumes and Sensitivity (±10%)

CHAMBER MODEL Volume cm3 C/mGy 20 ºC C/mGy 22 ºC C/R 20 ºC C/R 22 ºC
RC6 6 2.1E-10 2.1E-10 1.9E-09 1.9E-09
RC6M 6 2.1E-10 2.1E-10 1.9E-09 1.9E-09
RC60 60 2.1E-09 2.1E-09 1.9E-08 1.9E-08
RC3CT 3 1.1E-10 1.1E-10 9.3E-10 9.3E-10
RC180 180 6.4E-09 6.3E-09 5.6E-08 5.6E-08
RC1800 1800 6.4E-08 6.3E-08 5.6E-07 5.6E-07

 

Disconnect Cable and Electrometer Termination