The Design of a Condenser Dose-meter

Factors in the design of instruments for the measurement of X-ray dose are considered with particular reference to a self-contained instrument using a quartz-fibre electroscope. Sufficient theory is given to show how manufacturing tolerances may be accommodated. The design of condenser ionization chambers is also discussed and three chambers are described. Results are given which show their suitability for their intended purpose and attention is given to effects to be expected when they are used at radiation qualities and intensities outside their normal working range. An appendix is devoted to the machining of polystyrene.