Fluke Biomedical TNT 12000 - Manual (Page 95)

A-1
Appendix A
Model 96020C Ion Chamber
Introduction
The Model 96020C parallel-plate ion chamber is optimized for low-level intensity
measurements. The chamber has a flat energy response suitable for both attenuated and
unattenuated diagnostic beam qualities. Complete physical, electrical, and energy
response specifications are given in this appendix.
Physical Specifications
12.90 cm
1.88 cm
Direction
of incident
radiation
Diameter of active area = 11.30 cm
fct28.eps
Figure A-1. Model 96020C Ion Chamber Dimensions
Description ............................................................ Vented, parallel-plate air ionization chamber
Overall Dimensions .............................................. 12.90
± 0.03 cm diameter by 1.88 ± 0.01 cm thick
Nominal Volume.................................................... 150cc, 11.30 cm diameter by 1.50 cm thick active volume
Wall Material .......................................................... Composite graphite-filled thermoplastic
Window Material.................................................... 0.76 mm thick, graphite-coated polycarbonate (lexan). A 3.5 by 4 cm
piece of 0.0025 cm thick aluminum is attached to the back of the
window to improve the energy response.