All articles tagged with #radiation
Light from the Sun reaches Earth in about eight minutes, but the energy that becomes sunlight spends roughly 170,000 years diffusing through the Sun’s dense interior via countless absorptions and re-emissions. The 500,000-year figure is not supported by peer‑reviewed sources. After escaping the photosphere, photons traverse space to Earth in about eight minutes.
A JAMA Internal Medicine study analyzing over 12 million death certificates found that flight attendants have the highest percentage of deaths from radiation-related cancers, with pilots second; about 6.9% of flight attendant deaths and 6.7% of pilot deaths were due to these cancers, versus 5% in the general workforce. The study attributes this to cosmic radiation exposure at high flight altitudes and notes limitations such as unknown individual exposures and potential death-certification misclassifications, with jetlag-related circadian disruption possibly contributing. The FAA acknowledges crew exposure but has no federal dose limits or monitoring. The authors and experts call for better education and health surveillance for high-altitude aviation workers, including annual skin exams and earlier mammograms for women.
A JAMA Internal Medicine analysis of death certificates finds flight attendants have about 50% higher odds, and pilots about 36% higher odds, of dying from radiation‑related cancers than the general workforce. The study covers cancers linked to radiation exposure (including leukemia, lymphoma, multiple myeloma, and various solid tumors) and reports absolute risks of about 6.9% for flight attendants and 6.7% for pilots (vs. 5% in the general population). Limits include unknown personal exposure levels and potential misclassification; experts and unions urge better monitoring and preventive care such as regular skin exams and earlier mammograms for high‑altitude workers.
A large analysis of more than 12 million death certificates links flight attendants and pilots to higher mortality from radiation-related cancers, with flight attendants about 50% and pilots about 36% higher odds than the general workforce. Absolute rates are roughly 6.9% and 6.7% respectively, vs 5% overall. Limitations include unknown individual exposures and possible misclassification; jet lag/circadian disruption may contribute. The findings support monitoring and potentially earlier cancer screening for aircrew.
A new study using 12.7 million U.S. death certificates (2020–2024) finds airline pilots and flight attendants have the highest shares of deaths from radiation-related cancers, likely due to elevated cosmic radiation exposure at altitude. Shielding aircraft is not practical, but the authors urge stronger protections—active dosimetry, routine dose tracking, and regulatory limits for aircrew—especially on high-altitude or polar routes. The study also notes the U.S. currently has no formal dose limits or mandatory monitoring for aircrew, unlike the EU.
A StemRad AstroRad vest tested on Artemis I phantoms could cut radiation doses from solar particle events by up to ~60%, potentially reducing lifetime cancer risk and enabling safer long-duration space travel. Intended as an emergency countermeasure worn during elevated radiation, the ~57-pound vest complements a storm shelter and could be used in exploration beyond Earth, with further work including space-based manufacturing of shielding components.
Lab experiments simulating Europa’s icy surface show that high-energy electrons can energize salts in the ice to emit faint visible light—green, blue, or white—on the moon’s night side. The glow depends on composition and radiation, offering a potential chemical map of surface salts and, indirectly, clues about the subsurface ocean. It’s not a direct ocean readout, and the signal could be faint or variable, but Europa Clipper may test whether such nightside emission exists and helps link surface chemistry to the hidden ocean.
Researchers sequencing the genomes of Chernobyl cleanup workers and others exposed to ionizing radiation found clusters of new mutations in their children, with the strongest signal tied to paternal exposure. The findings suggest a potential transgenerational signature, but the estimated increase in genetic-disease risk is small and results come with uncertainties and validation challenges. More extensive studies, like the ongoing TRIO project, are planned to clarify the effect.
A dark melanized fungus, Cladosporium sphaerospermum, thriving inside the Chernobyl exclusion zone, may exploit ionizing radiation for energy via a proposed radiosynthesis process powered by melanin. While the fungus grows better in radiation and has shown to attenuate radiation in an ISS exposure test, scientists have not proven a real energy-harvesting mechanism or carbon fixation, and the phenomenon is not universal among melanized fungi.
Mars’s first crews will be radiation workers, dust custodians, and weather watchers, focusing on continuous dose budgeting, dust control, and light monitoring rather than heroic feats. A round-trip transit could deliver about 0.66 Sv, with a 500‑day surface stay bringing near 1 Sv—above some lifetime cancer risk thresholds and within NASA/ESA limits depending on shielding and solar conditions. Dust carries toxins and clings to gear, making filtration, airlocks and suitports essential. Dust storms primarily dim the Sun, so the job is about preserving power and visibility, not fending off wind. The frontier favors methodical, disciplined minds; the reward is the actual desert dawn, not the drama surrounding it.
Hackaday profiles a benchtop neutron generator by Rapp Instruments that ionizes deuterium and accelerates the ions into a titanium target inside a vacuum to produce neutrons (with occasional helium). Neutrons are detected by activating silver or indium foils around a Geiger counter, showing activity decay over time. The device uses a two-stage high-voltage setup (about 20 kV for ionization and 100 kV for acceleration) inside an evacuated glass tube with an oil diffusion pump. The piece notes the results (e.g., Ag-110/Ag-108 signals) and frames the project as an accessible entry point for amateur nuclear experimentation, linking to broader neutron-generator theory.
The Space Daily piece argues that even the most experienced planetary scientists warn that a crewed Mars mission will impose serious, partly irreversible costs—radiation exposure with mortality estimates in the several percent range, significant bone and muscle loss due to microgravity, and substantial psychological strain during a multi-year round trip—yet missions are proceeding into the 2030s (including SpaceX plans) because the strategic drive to explore and expand capability overrides unresolved risks, shaping a framework where volunteers accept sizable, not fully calculable risks for the chance to reach another planet.
Forty years after the disaster, wildlife around the Chernobyl exclusion zone shows a mix of thriving populations and unusual traits. Some species have benefited from reduced human activity and habitat changes, while others exhibit notable features (e.g., darker tree frogs, altered forests, more wolves and bears). Scientists debate whether these changes are direct radiation adaptations or the result of environmental shifts and other factors, including transgenerational mutations and climate stress.
Forty years after the Chernobyl disaster, the exclusion zone remains heavily contaminated, but wildlife populations—from wolves and elk to roe and deer—flourish in the absence of humans, prompting a debate over nuclear power’s environmental trade-offs. While some scientists argue the area shows how ecosystems rebound when human pressure fades, others caution about potential genetic damage in certain species and warn against reviving nuclear energy amid safety and geopolitical risks. The discussion echoes debates sparked by Fukushima and the Korean DMZ, with broad implications for climate goals and energy security.
The Conversation piece argues that headlines about radiation driving dramatic wildlife changes at Chernobyl are overstated; while some dog populations show genetic differences, these are more likely due to breed history, habitat, and disease than radiation. The broader point is that the exclusion zone’s ecosystems are shaped far more by the absence of humans, effectively turning parts of it into a nature reserve, than by radiation exposure. Long‑term health effects on people from the accident remain socio‑economic and mental health concerns, underscoring the need for careful science communication to curb misinformation.