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Tartrazine Solution as Dosimeter for Gamma Radiation Measurement

100%

Gobara M. , Baraka A.

tom Vol. 14, iss. 1

106--117

In this study, Tartrazine aqueous solution was investigated as a simple low-dose dosimeter in the range of 20-500 Gy for the high ionizing radiation, gamma ray. Gradual bleaching of Tartarzine solution was observed with dose by measuring the absorbance of Tartarzine-solutions at specified wavelength, λmax = 428 nm. Tartrazine concentration (10–4, 5 ×10–4 and 10–3 M) and solution-initial pH value (5, 7 and 9) were considered as factors affecting degree of bleaching. It was found that Tartarzine-solution color was diminished gradually with selected dose range due to breakdown of the azo bond. The rate of bleaching increases with the increase of solution-initial pH. Increase of Tartarzine-concentration causes widening of range to which solution is susceptible. The post-irradiated effect (24 hours) was found to cause more bleaching. The sensitivity of Tartrazine solution is not regular with the Tartarzine-concentration and regular with pH.

Analysis of noise sources and selection of ear protector in a coal mine

72%

Erol I. , Su O.

tom Vol. 67, no. 3

455--476

In this study, the noise sources to which a coal miner, who works at the Kurul panel of Kilimli Colliery, Zonguldak, was exposed were investigated. These sources were positioned at different points from the surface to the workface. Noise levels were measured according to the working periods of the coal miners around the machines. The results were evaluated under the Turkish Noise Regulation. The critical exposure times in which the coal miners could work without the use of personal protective equipment were examined according to the noise values to which they were exposed. In addition, the personal noise exposure values of the machine operators (boring machine, electro-hydraulic drill, and pick hammer) were determined during the development works. Two different types of noise measurements, with a microphone at the ear level and inside the ear protector, were conducted. The results obtained when the microphone of the personal dosimeter was at ear level, were found to be 15 dBA higher than those when the microphone was inside the ear protector. As a result, the selection methods of ear protectors were analyzed. Recommendations were given for those working on the risky tasks at the panel.

Zagrożenia wynikające z promieniowania UV i metoda pomiaru

58%

Andrzejewski M. , Wlazło P.

2013

tom R. 81, nr 12

24--27

Przedstawiono projekt przenośnego miernika promieniowania UVA i UVB przeznaczonego do pomiarów dawki oraz natężenia promieniowania osób narażonych na długotrwałą ekspozycję światła naturalnego lub sztucznego.

The paper presents a design of portable UVA and UVB radiation meter intended for measurement of radiation doses of persons exposed to prolonged natural or artificial light exposure.

Opracowanie mobilnego systemu pomiaru promieniowania UV do oceny indywidualnej dawki napromieniowania

58%

Andrzejewski M. , Wlazło P.

2013

tom Vol. 54, nr 4

101-103

Przedstawiono rozwiązanie ergonomicznego i przenośnego miernika promieniowania UV, który może być stosowany w komorach naświetlających oraz na świeżym powietrzu. Omówiono energooszczędne możliwości miernika, jego tryby pracy oraz analogowe moduły pomiarowe.

In the paper ergonomic and mobile UV meter has been presented. It can be used outdoors and inside radiation chamber. Energy-efficient aspects, working modes and analog meter module has been discussed.