2570/1 Farmer Dosemeter
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  2570/1 Farmer Dosemeter


With a proven performance record for long-term stability and precision, the 2570/1 is easy to operate and is tough enough to meet the demands of everyday use. This electrometer is used primarily in the medical field and is capable of measuring electrons, x-rays and gamma rays from linear accelerators, cobalt 60 units, and other radiation sources. The measurement process is highly automated.

   Product Detail


The 2570 Farmer is a battery-portable electrometer with a proven performance record for long-term stability and precision. The Farmer has become the worldwide standard for routine therapy beam dosimetry.

Features:

  • Easy to operate
  • Selector switches for 0.03, 0.6 and 600 cm3 chambers
  • Entry of correction factors for pressure, temperature and chamber response
  • Built-in timer with preset facility
  • Trip at dose limit
  • Output for printer
  • Polarising voltage ratio switching

The Farmer Dosemeter: Tough enough to meet the demands of everyday use.

Having set the standards in radiotherapy dosimetry throughout the world for over forty years, the Farmer Dosemeter now offers unrivalled efficiency and precision to the treatment planner. Calculations which have previously been laborious and time consuming are performed automatically at a finger's touch.

It is ideal for the routine measurement of electrons, x-rays and gamma rays from linear accelerators, cobalt 60 units and other radiation sources to standardise outputs before treatment. It can also control the precise dose delivered to the patient during treatment. Portable and rugged - offering excellent long term stability, it measures up to the day to day routines with the precision of a secondary standard.

All Farmer Dosemeter systems are built to Thermo's approved quality assurance programme and strict calibration procedures - you can be sure that optimum measurement can be performed from day one.

Patient Benefits During Treatment

  • Dose from treatment is controlled precisely through opto-isolator
  • For safety, keyboard is disabled during measurement/treatment
  • Main amplifier zero control for accuracy of dose

Chamber Saturation Determination

The polarising voltage divider provides quick and accurate determination of ionisation chamber collection efficiency - using the two point technique ICRU34/Boag.
 
  • +/- V, +/- V/2, +/- V/4, +/- V/8
  • For continuous, pulsed and swept beam radiation
  • Voltage ratios defined to better than +/- 2%
  • Lockable selector switches
 
Purchase Details
SKU : 2570/1 
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Specifications:
Linearity (Charge or Dose Ranges): :+/- 0.05% of range full scale
Resolution (Charge or Dose Ranges): :+/- 0.03% of range full scale
Leakage Current: :+/- 1 x 10^-14 of range full scale
Long Term Stability: :Better than +/-0.3% per year
Precision (Repeatability): :+/- 0.1% typically
Calibration Accuracy:- :Charge: +/- 0.5% of Uncorrected indicated value
Dose: (0.6cc chamber) +/- 0.5% against NPL Secondary Standard
Range Change Error (Low:High Gain ratio): :Better than +/- 0.2%
Temperature Coefficient (Charge or Dose readings): :+/- 250 ppm/°C
Timer range: :1 to 4000 secs
Timer resolution: :0.1 sec
Correction Factors: :Ambient Pressure: 500 - 1100 millibars
Ambient Temperature: 0 - 40°C
Chamber Factor: 0.800 - 1.200
Output (Cannon DE9S):- :Printer: Optically isolated 20mA current loop
Trip: Optically isolated transistor switch
Dimensions (Instrument): :(W) 315 mm x (D) 285 mm x (H) 145 mm
Weight: :4.0 kg