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1

Conversion coefficients from fluence and air kerma to personal dose equivalent for monoenergetic photons using analytical fit and Monte Carlo simulation

Al Kanti Hassan, El Hajjaji O., El Bardouni T.

Polish Journal of Medical Physics and Engineering

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2020

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Vol. 26, Iss. 1

31--44

EN

The present study aims to calculate a new database of conversion coefficients from fluence and air Kerma to personal dose equivalent in two terms: absorbed dose and Kerma-approximations. In this work, we propose a new equation to perform an analytical fit of our Monte Carlo (MC) calculated conversion coefficients for photons for different angles. Also, we have calculated the conversion coefficients using the EGSnrc code. The conversion coefficients have been calculated for beams of monoenergetic photons from 0.015 to 10 MeV, incident on phantom ICRU for angles of incidence from 0° to a 75° in steps of 15°. Our computed values agree well when compared with those published for the ICRU 57 in Kerma-approximations with statistical uncertainties in the calculation around 2%. We can conclude from this work that the analytical approach is successful and powerful such as Monte Carlo methods to calculate the operational quantities.

2

Comparison of incident air kerma (ki) of common digital and analog radiology procedures in Kohgiluyeh and Boyer-Ahmad province

Vafapour H., Salehi Z.

Polish Journal of Medical Physics and Engineering

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2018

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Vol. 24, Iss. 1

37--41

EN

Introduction: Although in many developed countries, Analog radiography (AR) is replaced with digital radiography (DR) but AR is still widely used in many countries included Iran. Therefore, dosimetrically assessment of delivered dose is very important to avoid unnecessary patient dose. Materials and Methods: In this study, all imaging centers in Kohgiluyeh and Boyer-Ahmad were selected. The initial information included the mean kVp and mAs used by the personnel to perform each radiological procedure were gathered through a questionnaire. Barracuda dosimeter was then used to measure Incident air kerma (ki). Data obtained from digital radiography (DR) and analogue radiography (AR) were then analyzed and compared to each other. Results: The mean incident air kerma (ki) for five radiological procedures (chest AP&Lat, Skull AP&Lat, Lumbar spine AP&Lat, Thoracic spine AP&Lat and Pelvis) in digital devices were 0.38&1.34, 2.1&1.94, 4.99&7.83, 4.18& 6.41 and 4.33 mGy and those for analogue devices were 0.7&1.28, 3.05&3.02, 7.25&9.9, 7.125&8.36 and 5.36 mGy, respectively. Discussion and Conclusion: The use of low kVp or high mAs is one of the reasons to increase the incident air kerma (ki) in analogue methods comparing to digital methods in all procedures except the chest (in Lateral view). Also the results, surprisingly, showed that in some of the analogue methods incident air kerma (ki) was less than digital methods which is most probably because of the auto-exposure conditions.

3

Porównanie metod pomiarów małych prądów jonizacyjnych

Knyziak A.

Przegląd Elektrotechniczny

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2009

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R. 85, nr 10

177-181

PL

W niniejszej pracy przedstawiam metody pomiarów małych prądów jonizacyjnych i wyniki ich porównań. Metody te stosowane są w systemach pomiarowych pracujących w Głównym Urzędzie Miar na stanowisku wzorcowym do odtwarzania i przekazywania jednostki miary dawki ekspozycyjnej, jednostki miary mocy dawki ekspozycyjnej, jednostki miary kermy w powietrzu i jednostki miary mocy kermy w powietrzu promieniowania gamma w zakresie energii fotonów od 600 keV do 3 MeV.

EN

At this work I am presenting methods of low ionization current measurements and results of their comparisons. The methods applied on the measuring systems working at the Central Office of Measures on the metrological stand for the reference standard of the air kerma and the air kerma rate for the gamma radiation of photons in the energy range from 600 keV to 3 MeV.

4

Metody pomiarów małych prądów jonizacyjnych rzędu 10-15 A

Knyziak A.

Przegląd Elektrotechniczny

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2009

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R. 85, nr 2

56-58

PL

W niniejszej pracy przedstawiam metody pomiarów małych prądów jonizacyjnych stosowanych w systemach pomiarowych pracujących w Głównym Urzędzie Miar na stanowisku wzorcowym do odtwarzania i przekazywania jednostki miary dawki ekspozycyjnej, jednostki miary mocy dawki ekspozycyjnej, jednostki miary kermy w powietrzu i jednostki miary mocy kermy w powietrzu promieniowania gamma w zakresie energii fotonów od 600 keV do 3 MeV.

EN

At this work I am presenting methods of low ionization current measurements applied on the measuring systems working at the Central Office of Measures on the metrological stand for the reference standard of the air kerma and the air kerma rate for the gamma radiation of photons in the energy range from 600 keV to 3 MeV.