نتایج جستجو برای: space radiation
تعداد نتایج: 719655 فیلتر نتایج به سال:
If humans ever start to live permanently in space, assisted reproductive technology using preserved spermatozoa will be important for producing offspring; however, radiation on the International Space Station (ISS) is more than 100 times stronger than that on Earth, and irradiation causes DNA damage in cells and gametes. Here we examined the effect of space radiation on freeze-dried mouse sperm...
Naturally occurring radiation to which astronauts may be exposed come in three main forms: galactcosmic rays (GCRs), charged particles accelerated to high energies by eruptive events at the Sun (solar energetic particles, or SEPs), and highly energetic particles trapped in the inner magnetospheres of the Earth and other magnetized planets. Figure 1 shows the various types of radiation that perv...
The space radiation environment presents serious challenges to spacecraft design and operations: adding costs or compromising capability. Our understanding of radiation belt dynamics has changed dramatically as a result of new observations. Relativistic electron fluxes change rapidly, on time scales less than a day, in response to geomagnetic activity. However, the magnitude, and even the sign,...
Heavy ions light flashes and brain functions: recent observations at accelerators and in spaceflight
Interactions between ionizing radiation in space and brain functions, and the related risk assessments, are among the major concerns when programming long permanence in space, especially when outside the protective shield of the Earth’s magnetosphere. The light flashes (LF) observed by astronauts in space, mostly when dark adapted, are an example of these interactions; investigations in space a...
Permanent and transient effects are discussed that are induced in linear integrated circuits by space radiation. Recent developments include enhanced damage at low dose rate, increased damage from protons due to displacement effects, and transients in digital comparators that can cause circuit malfunc-tions. Methods of selecting and testing devices for space applications are discussed, along wi...
Study Objective. To evaluate the space creation, maintenance and absorption of an absorbable hydrogel injected into the perirectal space of patients prior to undergoing prostate radiotherapy. Design. CT or MR imaging performed before hydrogel application (Baseline), one week after hydrogel application, following 8 weeks of IMRT (78Gy total) and then again 6 months following implantation. Settin...
Background and Aim: Today, OSL (Optically Stimulated Luminescence) dosimetry system based on optical stimulation, includes systems that can meet many requirements for radiation protection in the field of medicine and space. The Calcium Sulfide (CaS) is one of the earth's alkaline sulfide materials which can be used as a detector in this system. In this research, some of the dosimetry propertie...
We would like to thank Ferlazzo and Foray (1) for their very important comments and suggestions. We will keep in mind that “scientists should take particular care to justify their methodology and moderate their conclusions.” One concern of Ferlazzo and Foray (1) is that our control experiment entailed exposure to the ground radiation of Japan, rather than to a high natural radiation background ...
The first plenary session of the meeting was dedicated to DNA repair. Investigators from six outstanding groups in the field were invited to present their latest findings. Speakers in the order of appearance included Dr Takashi Morita from Osaka City University in Japan, Dr Erica Werner from the group of Dr Paul Doetsch at Emory University in the USA, Dr Akinari Yokoya from the Japan Atomic Ene...
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