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Appendix
Features of Firmware Version “27JAN00” or Later B
B-1
Appendix B
Features of Firmware Version”27JAN00” or Later
B.1 Introduction
This addendum updates information provided in the Model 35040 Therapy Dosimeter Instruction Manual.
Particularly, the instrument now supports a measurement timer and extended charge and current ranges.
B.2 New Features
B.2.1 Overview
• Added timed charge, predicted timed charge, and the corresponding dose measurements
• Twenty (20) interval settings (1 to 9,999 s) selectable from the instrument’s front panel and user
programmable via the Customization software
• Ability to select the timer’s count mode and decimal places from the front panel
• Increased maximum charge from 2.4 μC to 19.999 mC
• Increased maximum current from 100 nA to 1.000 uA and auto-recovery for currents less than
1.200 μA
• ALC annunciator simplifies toggling of the automatic leakage compensation status and promotes
easy recognition of leakage compensation status
• Increased maximum effective time from “59 min 59.9 s” (3,599.9 s) to “5 h 33 min 19.9 s” (19,999.9
s)
B.2.2 Timed Measurements
The Model 35040 Therapy Dosimeter provides a timer for performing timed charge and dose
measurements. A typical application of the timer is for measuring brachytherapy sources. The
instrument supplies four timed measurement quantities, which may be added to any of the measurement
displays with the Customization software (refer to Section B.7).
While competing instruments may provide measurements similar to the timed charge or dose, the Model
35040 offers predicted timed measurements for superior diagnostic capabilities while measuring sources
delivering at a constant exposure rate (e.g., brachytherapy). The predicted timed measurements
extrapolate the amount of timed charge that should be collected at the completion of the interval, which
can reveal problems early in the measurement process versus waiting for the complete interval to expire.