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International Journal of Low Radiation (6 papers in press)
Natural radionuclides in water and sediments of the Sao Francisco River in Petrolina, Brazil by Cleomacio Miguel Silva, Crescencio Filho Abstract: This study seeks to determine the concentrations of 238U, 232Th, and 40K in water and sediments of the S Keywords: tenorm; radioactive isotopes; uranium; thorium; toxicity; risk.
Natural radioactivity measurements in drinking water and ingestion dose assessment: the case of the uranium-bearing region of Poli, Cameroon by Tchuente Siaka Yvette Flore, Younui Yakum-Ntaw Susan, Djepang Serge Alain, Saidou Abstract: This study aimed at measuring radioactivity in drinking water and to assess corresponding ingestion dose to the public and the uranium toxicity. Twenty samples were collected in the uranium-bearing region of Poli, Cameroon. Alpha- and gamma-spectrometry were used for radioactivity measurements. Activity concentrations for each radionuclide range from 0.7 Keywords: uranium; radium; polonium; alpha-spectrometry; gamma-spectrometry; ingestion dose; toxicity.
Preliminary study of the effect of environmental parameter variations on indoor radon concentrations in Mediterranean climate by Mounir Ait-Ziane, Malika Allab, Zohra Lounis-Mokrani Abstract: For the radon map elaboration, radon measurements are generally performed in different seasons. Correction factors must be applied in order to represent comparable concentrations. The effects of environmental parameters have been investigated for the determination of these seasonal correction factors. Radon concentration measurements have been performed in several locations in Algiers over more than 17 seasonal periods. The average concentrations showed that the daily maximum appears in the early morning and the daily minimum in the late afternoon. Furthermore, the indoor radon concentration negatively correlates with both the indoor temperature and the relative humidity, with correlation coefficients equal respectively to -0.22 and -0.31. The annual pattern features a maximum around December and a minimum around June. Keywords: radon; Mediterranean climate; seasonal radon variation.
Measurement of natural radioactivity in Kufa River, Iraq by Hayder Hussain Abstract: The level of natural radioactivity for 226Ra, 228Ra and 40K are measured for 28 water samples taken from Kufa River in the Governorate of Al-Najaf Al-Ashraf in Iraq. Measurements were performed using a HPGe gamma-ray spectrometer system. The activity concentration in (mBq/l) varied from 17.70 Keywords: natural radioactivity; HPGe gamma spectrometry; annual effective dose; Kufa River.
Assessment of natural radioactivity levels and associated radiological hazard in scale and sludge from Jubilee oilfield of Ghana by David Okoh Kpeglo, Juan Mantero, Emmanuel Darko, Augustine Faanu, Edith Amoatey, Guillermo Manjón, Ignacio Vioque, Rafael Garcia –Tenorio Abstract: Knowledge of accurate radioisotopic signatures and chemical constituents is essential in assessing potential radiological hazards to the public and workers from exposure to NORM waste. For that reason, scale and sludge samples from Ghanaian oilfields were assessed using alpha spectrometry, gamma spectrometry, radon monitoring and scanning electron microscopy techniques. Activity concentration of 238U, 232Th series and 40K radionuclides for NORM residues have been evaluated. Fourteen trace elements were also identified and semi-qualitatively quantified. The obtained results clearly reflect that scale and sludge may present radiological risk for workers, public and environment. Keywords: NORM waste; trace elements; scale; sludge; radon; gamma spectrometry; alpha spectrometry; scanning electron microscopy.
Measurement of radon exhalation rate in various building materials used in Morocco by Murad Al Mugahed, Farida Bentayeb Abstract: Measurements of radon surface and mass exhalation rates were made for 35 types of building material samples frequently used in Morocco. In this survey, we used the Can technique, containing CR-39 detectors, to estimate the radon exposure from building materials. The surface and mass exhalation rates ranged from 37.92 mBq2 h1, 3.05 mBq kg1 h1 to 1545.60 mBq m2 h1, 43.14 mBq kg1 h1, with an average of 271.4192 mBq m2 h1 and 10.23 mBq kg1 h1, respectively. All the values of effective radium content and effective dose were calculated and they were within the safe limits in all samples studied. Keywords: radon exhalation; effective radium content; CR-39 detector; Can technique; building materials; annual effective dose.