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Cosmic Radiation

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https://www.readbyqxmd.com/read/28814301/incidence-of-cancer-among-licenced-commercial-pilots-flying-north-atlantic-routes
#1
Eva Maria Gudmundsdottir, Jon Hrafnkelsson, Vilhjalmur Rafnsson
BACKGROUND: To evaluate cancer incidence among licenced commercial pilots in association with cosmic radiation. METHODS: Cohort study where ionizing radiation dose of cosmic radiation was estimated from airline data and software program and cancer incidence was obtained by record linkage with nation-wide cancer registry. All licenced commercial male airline pilots were followed from 1955 to 2015, ever or never employed at airline with international routes. Standardized incidence ratios were calculated and relative risk by Poisson regression, to examine exposure-response relation...
August 16, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28767703/simulated-space-radiation-sensitizes-bone-but-not-muscle-to-the-catabolic-effects-of-mechanical-unloading
#2
Andrew R Krause, Toni L Speacht, Yue Zhang, Charles H Lang, Henry J Donahue
Deep space travel exposes astronauts to extended periods of space radiation and mechanical unloading, both of which may induce significant muscle and bone loss. Astronauts are exposed to space radiation from solar particle events (SPE) and background radiation referred to as galactic cosmic radiation (GCR). To explore interactions between skeletal muscle and bone under these conditions, we hypothesized that decreased mechanical load, as in the microgravity of space, would lead to increased susceptibility to space radiation-induced bone and muscle loss...
2017: PloS One
https://www.readbyqxmd.com/read/28754325/subtraction-of-natural-radiation-contribution-from-gamma-ray-spectra-measured-by-hpge-detector
#3
Petr Kovář, Jaroslav Šolc
A method is described for the subtraction of Monte Carlo simulated detector spectra of the contribution of natural radiation to measured detector spectra aiming to decrease the decision threshold for the detection of artificial radionuclides. HPGe detector spectra were simulated for selected naturally occurring radionuclides deposited onto a filter used for aerosol collection in a newly developed airborne radioactivity monitoring system. Stepwise, the simulated spectra were fitted to the actually acquired gamma-ray spectrum and the decision threshold was determined...
July 18, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28753350/%C3%AE-ray-constraints-on-decaying-dark-matter-and-implications-for-icecube
#4
Timothy Cohen, Kohta Murase, Nicholas L Rodd, Benjamin R Safdi, Yotam Soreq
Utilizing the Fermi measurement of the γ-ray spectrum toward the Inner Galaxy, we derive some of the strongest constraints to date on the dark matter (DM) lifetime in the mass range from hundreds of MeV to above an EeV. Our profile-likelihood-based analysis relies on 413 weeks of Fermi Pass 8 data from 200 MeV to 2 TeV, along with up-to-date models for diffuse γ-ray emission within the Milky Way. We model Galactic and extragalactic DM decay and include contributions to the DM-induced γ-ray flux resulting from both primary emission and inverse-Compton scattering of primary electrons and positrons...
July 14, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28733661/helical-phase-structure-of-radiation-from-an-electron-in-circular-motion
#5
M Katoh, M Fujimoto, N S Mirian, T Konomi, Y Taira, T Kaneyasu, M Hosaka, N Yamamoto, A Mochihashi, Y Takashima, K Kuroda, A Miyamoto, K Miyamoto, S Sasaki
We theoretically show that a single free electron in circular motion radiates an electromagnetic wave possessing helical phase structure, which is closely related to orbital angular momentum carried by it. We experimentally demonstrate it by interference and double-slit diffraction experiments on radiation from relativistic electrons in spiral motion. Our results indicate that photons carrying orbital angular momentum should be created naturally by cyclotron/synchrotron radiations or Compton scatterings in various situations in cosmic space...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723273/the-repair-project-examining-the-biological-impacts-of-sub-background-radiation-exposure-within-snolab-a-deep-underground-laboratory
#6
Christopher Thome, Sujeenthar Tharmalingam, Jake Pirkkanen, Andrew Zarnke, Taylor Laframboise, Douglas R Boreham
Considerable attention has been given to understanding the biological effects of low-dose ionizing radiation exposure at levels slightly above background. However, relatively few studies have been performed to examine the inverse, where natural background radiation is removed. The limited available data suggest that organisms exposed to sub-background radiation environments undergo reduced growth and an impaired capacity to repair genetic damage. Shielding from background radiation is inherently difficult due to high-energy cosmic radiation...
July 19, 2017: Radiation Research
https://www.readbyqxmd.com/read/28687805/nuclear-physics-meets-the-sources-of-the-ultra-high-energy-cosmic-rays
#7
Denise Boncioli, Anatoli Fedynitch, Walter Winter
The determination of the injection composition of cosmic ray nuclei within astrophysical sources requires sufficiently accurate descriptions of the source physics and the propagation - apart from controlling astrophysical uncertainties. We therefore study the implications of nuclear data and models for cosmic ray astrophysics, which involves the photo-disintegration of nuclei up to iron in astrophysical environments. We demonstrate that the impact of nuclear model uncertainties is potentially larger in environments with non-thermal radiation fields than in the cosmic microwave background...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28671130/association-of-radon-background-and-total-background-ionizing-radiation-with-alzheimer-s-disease-deaths-in-u-s-states
#8
Steven Lehrer, Peter H Rheinstein, Kenneth E Rosenzweig
BACKGROUND: Exposure of the brain to ionizing radiation might promote the development of Alzheimer's disease (AD). OBJECTIVE: Analysis of AD death rates versus radon background radiation and total background radiation in U.S. states. METHODS: Total background, radon background, cosmic and terrestrial background radiation measurements are from Assessment of Variations in Radiation Exposure in the United States and Report No. 160 - Ionizing Radiation Exposure of the Population of the United States...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28624541/the-high-prevalence-and-clinical-socio-demographic-correlates-of-miscarriages-among-flight-attendants
#9
Bettina Heidecker, Rachel Maureen Spencer, Victoria Hayes, Sarah Hall, Nisha Parikh, Eveline Oestreicher Stock, Rita Redberg
BACKGROUND: There are many occupational health hazards associated with long hours of air travel including cosmic radiation exposure, circadian rhythm disruptions and secondhand smoke exposure prior, for flight attendants who flew prior to smoking bans initiated in the 90s. Previous studies in flight attendants have found increased incidence of breast cancer and melanoma. However, there is little information on the relationship of airline travel and reproductive health in flight attendants...
June 14, 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/28613990/different-sequences-of-fractionated-low-dose-proton-and-single-iron-radiation-induced-divergent-biological-responses-in-the-heart
#10
Sharath P Sasi, Xinhua Yan, Marian Zuriaga-Herrero, Hannah Gee, Juyong Lee, Raman Mehrzad, Jin Song, Jillian Onufrak, James Morgan, Heiko Enderling, Kenneth Walsh, Raj Kishore, David A Goukassian
Deep-space travel presents risks of exposure to ionizing radiation composed of a spectrum of low-fluence protons ((1)H) and high-charge and energy (HZE) iron nuclei (e.g., (56)Fe). When exposed to galactic cosmic rays, each cell in the body may be traversed by (1)H every 3-4 days and HZE nuclei every 3-4 months. The effects of low-dose sequential fractionated (1)H or HZE on the heart are unknown. In this animal model of simulated ionizing radiation, middle-aged (8-9 months old) male C57BL/6NT mice were exposed to radiation as follows: group 1, nonirradiated controls; group 2, three fractionated doses of 17 cGy (1)H every other day ((1)H × 3); group 3, three fractionated doses of 17 cGy (1)H every other day followed by a single low dose of 15 cGy (56)Fe two days after the final (1)H dose ((1)H × 3 + (56)Fe); and group 4, a single low dose of 15 cGy (56)Fe followed (after 2 days) by three fractionated doses of 17 cGy (1)H every other day ((56)Fe + (1)H × 3)...
August 2017: Radiation Research
https://www.readbyqxmd.com/read/28554510/cosmic-ray-interaction-data-for-designing-biological-experiments-in-space
#11
T Straume, T C Slaba, S Bhattacharya, L A Braby
There is growing interest in flying biological experiments beyond low-Earth orbit (LEO) to measure biological responses potentially relevant to those expected during a human mission to Mars. Such experiments could be payloads onboard precursor missions, including unmanned private-public partnerships, as well as small low-cost spacecraft (satellites) designed specifically for biosentinel-type missions. It is the purpose of this paper to provide physical cosmic-ray interaction data and related information useful to biologists who may be planning such experiments...
May 2017: Life Sciences in Space Research
https://www.readbyqxmd.com/read/28554507/track-structure-model-of-microscopic-energy-deposition-by-protons-and-heavy-ions-in-segments-of-neuronal-cell-dendrites-represented-by-cylinders-or-spheres
#12
Murat Alp, Francis A Cucinotta
Changes to cognition, including memory, following radiation exposure are a concern for cosmic ray exposures to astronauts and in Hadron therapy with proton and heavy ion beams. The purpose of the present work is to develop computational methods to evaluate microscopic energy deposition (ED) in volumes representative of neuron cell structures, including segments of dendrites and spines, using a stochastic track structure model. A challenge for biophysical models of neuronal damage is the large sizes (> 100µm) and variability in volumes of possible dendritic segments and pre-synaptic elements (spines and filopodia)...
May 2017: Life Sciences in Space Research
https://www.readbyqxmd.com/read/28544977/environmental-radiation-dosimetry-at-argentine-antarctic-marambio-base-64%C3%A2-13-s-56%C3%A2-43-w-preliminary-results
#13
Alba Zanini, Vicente Ciancio, Monica Laurenza, Marisa Storini, Adolfo Esposito, Juan Carlos Terrazas, Paolo Morfino, Alessandro Liberatore, Gustavo Di Giovan
The preliminary results obtained in the first environmental radiation dosimetry campaign performed in the Antarctic region are presented. This experiment is carried out in the framework of CORA (COsmic Rays in Antarctica) Project, a collaboration between Argentine and Italian institutions. After a feasibility study performed in the Antarctic summer 2013, a new campaign has been carried out, started in March 2015, to measure various components of cosmic ray induced secondary atmospheric radiation at the Argentine Marambio Base (Antarctica; 196 m a...
September 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28523649/highly-sensitive-detection-of-ionizing-radiations-by-a-photoluminescent-uranyl-organic-framework
#14
Jian Xie, Yaxing Wang, Wei Liu, Xuemiao Yin, Lanhua Chen, Youming Zou, Juan Diwu, Zhifang Chai, Thomas E Albrecht-Schmitt, Guokui Liu, Shuao Wang
Precise detection of low-dose X- and γ-radiations remains a challenge and is particularly important for studying biological effects under low-dose ionizing radiation, safety control in medical radiation treatment, survey of environmental radiation background, and monitoring cosmic radiations. We report here a photoluminescent uranium organic framework, whose photoluminescence intensity can be accurately correlated with the exposure dose of X- or γ-radiations. This allows for precise and instant detection of ionizing radiations down to the level of 10(-4)  Gy, representing a significant improvement on the detection limit of approximately two orders of magnitude, compared to other chemical dosimeters reported up to now...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28500351/non-targeted-effects-models-predict-significantly-higher-mars-mission-cancer-risk-than-targeted-effects-models
#15
Francis A Cucinotta, Eliedonna Cacao
Cancer risk is an important concern for galactic cosmic ray (GCR) exposures, which consist of a wide-energy range of protons, heavy ions and secondary radiation produced in shielding and tissues. Relative biological effectiveness (RBE) factors for surrogate cancer endpoints in cell culture models and tumor induction in mice vary considerable, including significant variations for different tissues and mouse strains. Many studies suggest non-targeted effects (NTE) occur for low doses of high linear energy transfer (LET) radiation, leading to deviation from the linear dose response model used in radiation protection...
May 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28456220/a-double-vacuum-window-mechanism-for-space-borne-applications
#16
K Zilic, A Aboobaker, F Aubin, C Geach, S Hanany, N Jarosik, M Milligan, I Sagiv
We present a vacuum window mechanism that is useful for applications requiring two different vacuum windows in series, with one of them movable and resealable. Such applications include space borne instruments that can benefit from a thin vacuum window at low ambient pressures but must also have an optically open aperture at atmospheric pressures. We describe the implementation and successful operation with the E and B experiment balloon-borne payload, a millimeter-wave instrument designed to measure the polarization of the cosmic microwave background radiation...
April 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28418703/radioresistance-of-adenine-to-cosmic-rays
#17
Gabriel S Vignoli Muniz, Christian F Mejía, Rafael Martinez, Basile Auge, Hermann Rothard, Alicja Domaracka, Philippe Boduch
The presence of nucleobases in carbonaceous meteorites on Earth is an indication of the existence of this class of molecules in outer space. However, space is permeated by ionizing radiation, which can have damaging effects on these molecules. Adenine is a purine nucleobase that amalgamates important biomolecules such as DNA, RNA, and ATP. Adenine has a unique importance in biochemistry and therefore life. The aim of this work was to study the effects of cosmic ray analogues on solid adenine and estimate its survival when exposed to corpuscular radiation...
April 2017: Astrobiology
https://www.readbyqxmd.com/read/28405645/a-new-model-of-the-chemistry-of-ionizing-radiation-in-solids-ciris
#18
Christopher N Shingledecker, Romane Le Gal, Eric Herbst
The collisions between high-energy ions and solids can result in significant physical and chemical changes to the material. These effects are potentially important for better understanding the chemistry of interstellar and planetary bodies, which are exposed to cosmic radiation and the solar wind, respectively; however, modeling such collisions on a detailed microscopic basis has thus far been largely unsuccessful. To that end, a new model, entitled CIRIS: the Chemistry of Ionizing Radiation in Solids, was created to calculate the physical and chemical effects of the irradiation of solid materials...
April 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28338797/an-estimation-of-the-exposure-of-the-population-of-israel-to-natural-sources-of-ionizing-radiation
#19
L Epstein, J Koch, T Riemer, G Haquin, I Orion
The radiation dose to the population of Israel due to exposure to natural sources of ionizing radiation was assessed. The main contributor to the dose is radon that accounts for 60% of the exposure to natural sources. The dose due to radon inhalation was assessed by combining the results of a radon survey in single-family houses with the results of a survey in apartments in multi-storey buildings. The average annual dose due to radon inhalation was found to be 1.2 mSv. The dose rate due to exposure to cosmic radiation was assessed using a code that calculates the dose rate at different heights above sea level, taking into account the solar cycle...
February 18, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28292593/aerosol-particle-size-distribution-of-atmospheric-lead-210-in-northern-finland
#20
Jussi Paatero, Alexandra Ioannidou, Jussi Ikonen, Jukka Lehto
Size-segregated aerosol samples were collected with a high-volume 6-stage cascade impactor at Sodankylä, Finland, 100 km north of the Arctic Circle. The (210)Pb content of the samples were determined with radiochemical separation of in-grown (210)Po followed by alpha spectrometry. Most of the (210)Pb activity was incorporated in accumulation mode aerosol particles. The activity median aerodynamic diameter (AMAD) ranged from 0.53 μm to 0.98 μm 38-61 per cent of (210)Pb activity was found to be associated with aerosol particles smaller than 0...
June 2017: Journal of Environmental Radioactivity
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