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Pilot study of patient and phantom breast dose measurements in Bulgaria

100%
Avramova-Cholakova S., Vassileva J.
Polish Journal of Medical Physics And Engineering
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2008
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vol. 14
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issue 1
21-32
EN
A pilot study of breast dose measurements on two mammography units in Bulgaria was conducted. The mean glandular doses (MGDs) to samples of approximately 60 women per unit were measured. MGD with a standard PMMA phantom was measured as well. The MGDs were calculated according to the European protocol on dosimetry in mammography as well as to the European protocol for the quality control of the physical and technical aspects of mammography screening. The measured women's MGDs were divided into three groups depending on the compressed breast thicknesses. The results for the group of thicknesses in the interval 40-60 mm were compared with the results from the measurements on the standard 45 mm PMMA phantom. Some differences were found which could be due to errors in breast thickness measurements, differences in breast and phantom densities and other factors. A standardized procedure was elaborated for patient dose measurement and calculation both from patient and phantom studies.
2
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Sewage Sludge Combustion – Experimental and Theoretical Analysis

100%
Turkienė N., Zigmontienė A., Buinevičius K., Plečkaitienė R.
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vol. 34
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issue 2
203-214
EN
Whereas the use of biofuels has attracted increasing attention, the aim of this paper is to investigate the possibility of using sewage sludge as biofuel. Preparation of untreated and stabilised sludge with natural additives is described, as well as combusting method applied and experimental results of combusting are presented based on the assessment of composition of emitted pollutants and their concentrations in the exhaust gas. NOx formation in the exhaust gas has been analysed in depth. The results of investigations have shown that the use of dried sewage sludge possesses a positive energy balance. Therefore, the sludge may be used as fuel. The obtained experimental results demonstrate that during combustion, pollutant concentrations vary depending on oxygen content (O2), while formation of nitrogen oxides is strongly influenced by fuel-bound nitrogen. Also, a generalized equation of calculating fuel bound nitrogen conversion into NOx is presented.
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Sewage Sludge Combustion – Experimental and Theoretical Analysis

86%
Turkienė N., Zigmontienė A., Buinevičius K., Plečkaitienė R.
Chemical and Process Engineering
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2013
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issue 2
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