Abstract
This study presents the results of the preliminary tests performed using a kerma-area product (KAP) meter in order to verify its usefulness as a monitor chamber in a clinical X ray system, which will be used in ionization chambers’ quality control program. The tests performed were repeatability, surface measurement uniformity, linearity with tube current, measurement variation changing the distance and field size, KAP chamber radiation attenuation, and energy dependence. The KAP meter has presented a good repeatability (a maximum variation of 0.4%); its surface has a homogeneous response (a maximum variation of 1.0% among the different irradiated regions); the response is linear with the tube current and the variation of the PKA along the distance is less than 3.43%. On the other hand, the results obtained for chamber attenuation and energy dependence show that some corrections must be applied when the measurements are made. The results have shown a good performance of the KAP meter, confirming that it is possible to use this instrument as a monitor chamber. However, it is important to highlight that some correction factors for energy dependence and chamber radiation attenuation must be considered.
Highlights
In radiation meters calibration laboratories are common to find a monitor chamber in calibration setup, which isHow to cite this paper: Correa, E., Medeiros, R., da Penha Potiens, M., Vivolo, V., Costa, N., Murata, C. and Kikuti, C. (2015) Preliminary Tests of a Kerma-Area Product (KAP) Meter to Be Used as a Monitor Chamber in a Conventional Diagnostic X Ray System
In repeatability tests the KAP meter presented a maximum variation of 0.37% (Table 1)
There is no technical information about this phenomenon in the KAP meter user manual suggesting that it might be a characteristic of this instrument
Summary
In radiation meters calibration laboratories are common to find a monitor chamber in calibration setup, which isHow to cite this paper: Correa, E., Medeiros, R., da Penha Potiens, M., Vivolo, V., Costa, N., Murata, C. and Kikuti, C. (2015) Preliminary Tests of a Kerma-Area Product (KAP) Meter to Be Used as a Monitor Chamber in a Conventional Diagnostic X Ray System. When it is plugged to appropriate software, it is possible to obtain information about exposure time, accumulated air-kerma and air-kerma rate, and identify a possible beam intensity variation. This equipment is important in standardization dosimetry laboratories, which must always work with reduced uncertainties. The proposal of using the KAP meter in the conventional system as a monitor chamber is to reduce measurement uncertainties. This will be useful to verify the behavior of radiation detectors that are used in the diagnostic radiology energy range
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