Determination of specific activity of 226Ra, 232Th and 40K for assessment of radiation hazards from Turkish pumice samples

Turhan, Şeref; Gündüz, Lütfullah

doi:10.1016/j.jenvrad.2007.08.022

Cited by 68 publications

(34 citation statements)

References 21 publications

(18 reference statements)

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“…The same geometry and size are used for both measured and reference material samples. The measurements are collected for 20 to 24 hours [5]. …”

Section: Radioactivity Measurementsmentioning

confidence: 99%

Study of Heavy Elements and Radioactivity Concentrations in Some Eye Cosmetics Commonly Used in Arabic Regions

M¹,

Orabi²,

R³

2015

IJCEA

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Abstract-Thirteen samples of eye cosmetics including five samples of artificial eye cosmetics and eight samples of traditional eyeliner (kohl) were collected from various Arabic markets, and analyzed using inductively coupled plasma-optical emission spectrometer (ICP-OES) to assess concentrations of the most toxic elements (arsenic (As), cadmium (Cd), mercury (Hg) and lead (Pb)), and high purity germanium detector (HPGe) to determine radioactivity concentrations of the natural radionuclides 238 U, 235 U, 226 Ra, 232 Th and 40 K. The average concentrations of the elements As, Cd, Hg and Pb are a bit high in some samples in a way that they might cause some harm to human health, while the average values of the activity concentrations for 238 U, 235 U, 226 Ra, 232 Th and 40 K are not that high. Annual absorbed amounts of heavy elements from daily applied kohl were calculated based on roughly assumption that about 50 % of the applied kohl is absorbed into the body. An appropriate simulation has been done for the eye using the MCNP code to estimate the dose rate of the lens of the eye as a result of using contaminated kohl.

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“…The same geometry and size are used for both measured and reference material samples. The measurements are collected for 20 to 24 hours [5]. …”

Section: Radioactivity Measurementsmentioning

confidence: 99%

Study of Heavy Elements and Radioactivity Concentrations in Some Eye Cosmetics Commonly Used in Arabic Regions

M¹,

Orabi²,

R³

2015

IJCEA

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“…15 It is a solidified frothy lava typically created when superheated, highly pressurized rock is violently ejected from a volcano. The pumice block is a highly porous material, when the pores in pumice are filled with air, it can be buoyant in water.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Microstructure, Composition, and Cytocompatibility of Natural Pumice for Potential Biomedical Application

Yang

Zou

et al. 2010

Tissue Engineering Part C: Methods

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In this study, the properties of Changbaishan natural pumice were characterized including the microstructure, porosity, mechanical strength, composition, harmful trace element content, and cytocompatibility. The results show that the natural pumice has a porous structure with a pore size ranging from 50 to 150 mum, an interconnective porosity of 80%, and a compressive strength of 1.72 +/- 0.12 MPa, which are adequate as a scaffold for bone tissue engineering. The natural pumice is mainly composed of silicate, and the content of harmful trace elements of arsenic (As), cadmium (Cd), and mercury (Hg) in the pumice are less than 3 ppm, whereas the content of plumbum (Pb) is less than 5 ppm, which can meet the requirement of China Medicine Standard regulation. Cytocompatibility of the pumice was also evaluated by culturing and seeding MG63 cells on the scaffold and with its medium extraction. The cells present good adhesion and proliferation and the pumice does not show a negative effect on the MG63 cells in vitro. A period of 11 days testing by 3-{4,5-dimethylthiazol-2yl}-2,5-diphenyl-2H-tetrazolium-bromide assay demonstrates that the pumice has little influence on the cell viability. This new investigation paves the way for further study on pumice's potential for biomedical applications, such as for bone tissue engineering scaffold.

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“…This radium equivalent activity is a weighted sum of activities of the above named radionuclides. The estimation of Ra eq is based on the assumptions that 10 Bq kg -1 of 226 Ra, 7 Bq kg -1 of 232 Th and 130 Bq kg -1 of 40 K produce the same gamma dose rate (Turhan and Gunduz, 2007). The Ra eq is defined as: The mean values of the radium equivalent activity and the associated uncertainties calculated (using Eq.…”

Section: Resultsmentioning

confidence: 99%

Activity concentrations of primordial radionuclides in sediments of surface – water dams in southwest Nigeria – a baseline survey

Isinkaye

Farai

2008

Radioprotection

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Determination of specific activity of 226Ra, 232Th and 40K for assessment of radiation hazards from Turkish pumice samples

Cited by 68 publications

References 21 publications

Study of Heavy Elements and Radioactivity Concentrations in Some Eye Cosmetics Commonly Used in Arabic Regions

Study of Heavy Elements and Radioactivity Concentrations in Some Eye Cosmetics Commonly Used in Arabic Regions

Investigation on Microstructure, Composition, and Cytocompatibility of Natural Pumice for Potential Biomedical Application

Activity concentrations of primordial radionuclides in sediments of surface – water dams in southwest Nigeria – a baseline survey

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