Advanced Therapy Dosimeter
The Model 35040 Advanced Therapy Dosimeter is a reference-grade dosimeter that exceeds the
recommendations of calibration laboratories for leakage, linearity and stability by a wide margin.
It satisfies fundamental user requirements, performs automatic calculations and provides the
flexibility to customize displays via an IBM-compatible PC.
A unique electrometer design provides more accurate dose and dose rate measurements than
conventional high meg resistor and capacitor feedback electrometers. The Model 35040 is fully
stable within five minutes. The front panel controls selection of chamber calibration factors, enable
air density corrections, facilitate temperature and pressure entry, and allow bias voltage selection
and display. Effective exposure time is calculated using the average rate and total charge.
The front panel display screen can be customized and can simultaneously (and in real time)
show dose, dose rate, effective exposure time, average current/rate, accumulated charge/dose, bias
voltage, leakage, and other important information that ensures the validity of the measurement.
The customization software allows the user to design up to 16 display screens that display internal
conditions, set-up parameters, measurement values and text information. Up to 32 ion chamber
calibration factors can be be stored, and the user can program up to 11 bias voltages (in 1/10
Volt increments) from -500 volts to +500 volts in any sequence and select the values from the front
panel. The customization software operates with an IBM-compatible PC and connects via an RS-232 cable.