Results 141 to 150 of about 7,404,600 (175)
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1976 International Conference on Submillimeter Waves and Their Applications, 1976
The existence of essentially isotropic homogeneous cosmic background radiation with the spectrum of a 3 K blackbody places important limits on cosmological speculations. This radiation has been the subject of intensive experimental investigation for more than a decade.
P. L. Richards, D. P. Woody
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The existence of essentially isotropic homogeneous cosmic background radiation with the spectrum of a 3 K blackbody places important limits on cosmological speculations. This radiation has been the subject of intensive experimental investigation for more than a decade.
P. L. Richards, D. P. Woody
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A Background to Background Radiation
The Physics Teacher, 2003The study of radiation at the introductory college level usually includes experiments to determine the half-life of a radioactive isotope and also a study of the absorption of nuclear radiation by metal foils. These experiments are straightforward to do using a Geiger-Müller tube and scaler, and allow for the determination of well-known constants.
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The cosmic microwave background radiation
Reviews of Modern Physics, 1979Radio Astronomy has added greatly to our understanding of the structure and dynamics of the universe. The cosmic microwave background radiation, considered a relic of the explosion at the beginning of the universe some 18 billion years ago, is one of the most powerful aids in determining these features of the universe. This paper is about the discovery
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DarkLight radiation backgrounds
AIP Conference Proceedings, 2013We report measurements of photon and neutron radiation levels observed while transmitting a 0.43 MW electron beam through millimeter-sized apertures and during beam-on, but accelerating gradient RF-on, operation. These measurements were conducted at the Free-Electron Laser (FEL) facility of the Jefferson National Accelerator Laboratory (JLab) using a ...
N. Kalantarians +1 more
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Infrared Astronomical Background Radiation
La Rivista del Nuovo Cimento, 1970Measurements of astronomical background radiation are interesting because when they succeed they tell us the energy budget of the universe — at least that part of the budget that gives rise to electromagnetic radiation. Neutrino and gravitational radiation background measurements would be required before a complete ledger could be set up.
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A unique high natural background radiation area - Dose assessment and perspectives.
Science of the Total Environment, 2021M. Hosoda +23 more
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Soviet Atomic Energy, 1988
The data presented show that the yearly background dose equals on the average about 2 mSv (200 mrem). Two thirds of the dose is attributable to internal radiation from natural radionuclides—primarily the decay products of radon and thoron, entering the human body with inhaled air.
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The data presented show that the yearly background dose equals on the average about 2 mSv (200 mrem). Two thirds of the dose is attributable to internal radiation from natural radionuclides—primarily the decay products of radon and thoron, entering the human body with inhaled air.
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1998
Space is not dark and empty but filled with radiation. Most of its energy lies in the microwave region of the spectrum, near wavelengths of about 1 or 2 millimeters, coming evenly from all directions. This light, called the “cosmic microwave background radiation,” is left over from the Big Bang.
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Space is not dark and empty but filled with radiation. Most of its energy lies in the microwave region of the spectrum, near wavelengths of about 1 or 2 millimeters, coming evenly from all directions. This light, called the “cosmic microwave background radiation,” is left over from the Big Bang.
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1989
The photon is the best probe we have of the distant regions of the universe. There are two regions in the electromagnetic spectrum where one can expect to see far back into the universe. In both of these windows there are backgrounds which are now being explored and studied.
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The photon is the best probe we have of the distant regions of the universe. There are two regions in the electromagnetic spectrum where one can expect to see far back into the universe. In both of these windows there are backgrounds which are now being explored and studied.
openaire +2 more sources