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Robert D Daniels, Mary K Schubauer-Berigan
No abstract text is available yet for this article.
February 16, 2017: Radiation Protection Dosimetry
Kevin Kelleher, Jennie Wong, Luis León-Vintró, Lorraine Currivan
A radon in drinking water interlaboratory comparison (ILC) was conducted between eight laboratories in Europe. The majority of the measurement results submitted were in agreement with the assigned value, with a single result deemed questionable. The questionable result does not deviate significantly from the assigned value but the measurement uncertainties associated with this result could be too small. The results from this ILC indicate that there is good agreement between participating laboratories for radon in water measurements...
February 4, 2017: Applied Radiation and Isotopes
Andreas Otto, David Müller, Günter Radons
We show that the dynamics of systems with a time-dependent delay is fundamentally affected by the functional form of the retarded argument. Associating with the latter an iterated map, the access map, and a corresponding Koopman operator, we identify two universality classes. Members in the first are equivalent to systems with a constant delay. The new, second class is characterized by the mode-locking behavior of their access maps and by an asymptotically linear, instead of a logarithmic, scaling of the Lyapunov spectrum...
January 27, 2017: Physical Review Letters
Meghdad Pirsaheb, Farid Najafi, Abbas Haghparast, Lida Hemati, Kiomars Sharafi, Nematullah Kurd
BACKGROUND: Building materials and the ventilation rate of a building are two main factors influencing indoor radon and thoron levels (two radioactive gases which have the most important role in human natural radiation exposure within dwellings). OBJECTIVES: This analytical descriptive study was intended to determine the relationship between indoor radon and thoron concentrations and the building materials used in interior surfaces, as well as between those concentrations and the type of ventilation system (natural or artificial)...
October 2016: Iranian Red Crescent Medical Journal
Raquel Barbosa-Lorenzo, Juan M Barros-Dios, Alberto Ruano-Ravina
No abstract text is available yet for this article.
February 7, 2017: International Journal of Epidemiology
C Sabbarese, F Ambrosino, R Buompane, M Pugliese, V Roca
A complete and detailed analysis of alpha spectra from the (222)Rn and (220)Rn progenies was performed by newly developed software. The software identifies the alpha peaks, performs appropriate fits and calculates the net area and its uncertainty, considering the entire background. The deconvolution of the overlapped peaks of (218)Po and (212)Bi allows us also to evaluate their minimum detectable area. The efficiency of the electrostatic detection method was recalculated and new useful considerations on the collected alpha emitters were made...
January 31, 2017: Applied Radiation and Isotopes
Philippe Cassette, Franck Notari, Marie-Christine Lépy, Candice Caplan, Sylvie Pierre, Thomas Hainschwang, Emmanuel Fritsch
Treated green diamonds can show residual radioactivity, generally due to immersion in radium salts. We report various activity measurements on two radioactive diamonds. The activity was characterized by alpha and gamma ray spectrometry, and the radon emanation was measured by alpha counting of a frozen source. Even when no residual radium contamination can be identified, measurable alpha and high-energy beta emissions could be detected. The potential health impact of radioactive diamonds and their status with regard to the regulatory policy for radioactive products are discussed...
January 29, 2017: Applied Radiation and Isotopes
D E Tchorz-Trzeciakiewicz, M Kłos
We studied the influence of terrain, geology and weather condition on radon concentration in the atmosphere and occurrence of radon density currents. The survey was carried out in Kowary (SW Poland) and in the spoil tip formed during uranium mining. The measurements of radon concentration were performed using SSNTD LR-115. The measurements of uranium thorium and potassium content in soil were carried out using gamma ray spectrometer Exploranium RS-230. We noticed that terrain and stability of weather condition had significant impact on atmospheric radon concentration...
February 1, 2017: Science of the Total Environment
Evan J H Lewis, Frédéric Stucky, Peter W Radonic, Adam H Metherel, Thomas M S Wolever, Greg D Wells
PURPOSE: Sprint interval training (SIT) stimulates rapid metabolic adaptations within skeletal muscle but the nature of neuromuscular adaptions is unknown. Omega-3 polyunsaturated fatty acids (N-3 PUFA) are suggested to enhance neuromuscular adaptations to exercise. METHODS: We measured the neuromuscular adaptations to SIT (Study-1) and conducted a placebo-controlled randomized double blinded study to determine the effect of N-3 PUFA supplementation on neuromuscular adaptations to SIT (Study-2)...
February 3, 2017: European Journal of Applied Physiology
Jing Chen, Christophe Murith, Martha Palacios, Chunhong Wang, Senlin Liu
No abstract text is available yet for this article.
February 4, 2017: Radiation Protection Dosimetry
Kazuki Iwaoka, Masahiro Hosoda, Kazuaki Yajima, Shinji Tokonami
Twenty-five beauty products known to contain natural radionuclides were collected, and their (222)Rn mass exhalation rates were measured. The effective doses to workers due to (222)Rn exhaled from these products were estimated. The (222)Rn mass exhalation rates of these products were below 177 μBq kg(-1) s(-1) and were almost identical to those of natural rocks in Japan. The maximum effective dose of (222)Rn exhaled from these products was 71 μSv y(-1).
January 25, 2017: Applied Radiation and Isotopes
Janet A Ademola, Oluwaferanmi R Ojeniran
Water samples collected from different sources were analysed for radon concentrations in order to evaluate the health effect associated with radon in water. The radon concentrations were in the range of 3.56-98.57, 0.88-25.49, 0.73-1.35 and 0.24-1.03 Bq.L(-1) for borehole, well, packaged and utility water, respectively. Samples from boreholes had the highest radon concentrations with about 67% being higher than the threshold value of 11.1 Bq.L(-1) recommended by the USEPA. The mean annual effective dose (AED) due to ingestion for adult, child and infant ranged from 8...
February 2017: Journal of Water and Health
Eric J Hall
Gioacchino Failla was initially appointed to operate the radon plant at Memorial Hospital in 1916. What to most people would have been a part-time temporary position was to him a career. He was not satisfied to simply fabricate radon seeds, he wanted to understand the physics and biology of the radiation emitted by the progeny of radium. His was not the first medical physics group in the United States, though it was one of the earliest, but it was the first to put such emphasis on the biological effects. After more than 28 years at Memorial Hospital, Failla moved his research group to Columbia University Medical Center and his pioneering work, blending physics and biology, has continued to date at Columbia by those that he trained or inspired, under three directors that followed him...
January 31, 2017: Radiation Research
C Meenakshi, K Sivasubramanian, B Venkatraman
Radon is a naturally occurring radionuclide in the environment, during decay it emits high linear energy transfer (LET) alpha particles. When radon exposure is accompanied by smoking it has been reported that lung cancer risk is higher. Blood samples were collected after prior consent, 25 smokers and 25 non smokers (only males) exposed in vitro to radon gas with doses ranging between 0.3-12.6mGy Ionizing radiation is a strong clastogenic agent and a potent inducer of MN. Cytokinesis-Blocked Micro Nucleus (CBMN) assay has proven to be a reliable, thoroughly validated and standardised technique in the field of radiation biology...
February 2017: Mutation Research
Issam A Al-Khatib, Hamzeh Al Zabadi, Ghassan Saffarini
The main objective of this study was to assess Radon concentration in the harvested rainwater (HRW) at the household level in Yatta area, Palestine. HRW is mainly used for drinking as it is the major source of water for domestic uses due to water scarcity. Ninety HRW samples from the household cisterns were collected from six localities (a town and five villages) and Radon concentrations were measured. The samples were randomly collected from different households to represent the Yatta area. Fifteen samples were collected from each locality at the same day...
January 27, 2017: Journal of Environmental Radioactivity
Catherine Findlay, Jason Morrison, C J Mundy, Julia Sedlmair, Carol J Hirschmugl, Kathleen M Gough
We have used thermal source Fourier Transform Infrared (FTIR) microtomographic imaging to compare sea ice diatoms growing under different light conditions. A prototype tomography accessory was designed to have sufficient degrees of freedom to align any tilted cylindrical sample relative to the axis of rotation, minimizing the off-axis path traced during rotation. The lightweight device rests on the motorized stage to position the sample in the field-of-view and enable mosaic imaging. Reconstruction routines were tested with simulated and real phantoms, to assess limitations in the Radon back-projection method employed...
January 30, 2017: Analyst
Ivona Mladineo, Ivana Bušelić, Jerko Hrabar, Anamarija Vrbatović, Ivana Radonić
Recombinant genotypes of A. simplex sensu stricto (s.s.) and A. pegreffii, two species of Anisakis simplex complex found in sympatric waters of the Mediterranean Sea, are believed to be a product of interspecific hybridisation and/or DNA introgression. In contrast, such events within an allopatric area as the Adriatic Sea are unlikely to occur and therefore observed recombination should be assessed more closely. We have genotyped 525 anisakids collected from migratory and non-migratory fish of the southern part of the Adriatic Sea, inferring its omniparentage at nuclear (ITS locus) and matrilineage at mitochondrial locus (cox2)...
January 23, 2017: Molecular and Biochemical Parasitology
Yuu Ishimori, Hiroshi Tanaka, Akihiro Sakoda, Takahiro Kataoka, Kiyonori Yamaoka, Fumihiro Mitsunobu
The purpose of this study is to investigate the biokinetics of inhaled radon, radon activity concentrations in mouse tissues and organs were determined after mice had been exposed to about 1 MBq/m(3) of radon in air. Radon activity concentrations in mouse blood and in other tissues and organs were measured with a liquid scintillation counter and with a well-type HP Ge detector, respectively. Radon activity concentration in mouse blood was 0.410 ± 0.016 Bq/g when saturated with 1 MBq/m(3) of radon activity concentration in air...
January 25, 2017: Radiation and Environmental Biophysics
Momen Orabi
One of the main factors that affect the uncertainty in calculating the gamma-radiation absorbed dose rate inside a room is the variation in the degree of secular equilibrium of the considered radioactive series. A component of this factor, considered in this paper, is the release of radon (Rn) from building materials to the living space of the room. This release takes place through different steps. These steps are represented and mathematically formulated. The diffusion of radon inside the material is described by Fick's second law...
March 2017: Health Physics
Janet Ayobami Ademola, Oyebode Akanni Oyeleke
Radon concentration in groundwater collected from the eleven Local Government Areas (LGAs) of Ibadan, Nigeria, was analyzed. Annual effective doses due to ingestion and inhalation of radon from the consumption of the water were determined. The arithmetic means (AMs) of radon concentration for the 11 LGAs varied from 2.18 to 76.75 Bq l(-1) with a standard deviation of 1.57 and 70.64 Bq l(-1), respectively. The geometric means (GMs) varied from 1.67 to 49.47 Bq l(-1) with geometric standard deviation of 2.22 and 3...
January 24, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
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