Implementation of a free air ionization chamber for low energy X-ray beams stability control
Abstract
A free air ionization chamber is described. Measurement of the fluctuations of low energy X-ray photon beams is necessary to obtain the 0.5% accuracy required by an X-ray primary standard. The chamber has flat parallel electrodes in a cylindrical shape. Isolated aluminum rings with decreasing voltage are used to reduce the divergence of the electric field lines. Measurements show that the instrument reacts as expected to the voltage applied. The stability and reproducibility of the monitor are excellent.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- March 1983
- Bibcode:
- 1983STIN...8335349B
- Keywords:
-
- Ionization Chambers;
- Photon Beams;
- Radiation Measuring Instruments;
- X Ray Density Measurement;
- Accuracy;
- Electrodes;
- Energy Levels;
- Monitors;
- Photon Beams;
- Radiation Dosage;
- Standards;
- Instrumentation and Photography