Sentences with phrase «background radiation sources»

Not exact matches

«Measurements of the extragalactic background radiation are always hard to get, because this signal is very faint and, as a result, its detection is strongly dependent on how well one can remove the sources of contamination,» says Angelica De Oliveira - Costa, an expert on cosmic background observations at the Massachusetts Institute of Technology.

To put these numbers in perspective, the average person encounters 360 millirems of annual «background radiation» from natural and man - made sources, including substances in Earth's crust, cosmic rays, residue from nuclear tests and smoke detectors.

Taking into account natural background radiation, medical procedures and other sources, people in the U.S. encounter an average of about 6.5 millisieverts per year.

«The only source of noise is the cosmic microwave background,» says Tarter, referring to remnant radiation from the big bang, whose signal has been well studied.

The correlation we observed is compatible with the hypothesis that the highest - energy particles originate from nearby extragalactic sources whose flux has not been substantially reduced by interaction with the cosmic background radiation.

These detectors require a large collecting area, because celestial X-ray sources are remote and therefore weak, and a high efficiency for detecting X-rays over the cosmic - ray - induced background radiation is needed.

Furthermore, the team concluded that approximately 80 % of the sources of the cosmic background radiation (* 2) within the millimeter / submillimeter wavebands are more «normal galaxies» like those detected by ALMA this time..

He states that the levels of radiation in the US Pacific coast are rather insignificant when compared to other background sources of radiation that already exist in the US, or compared to our exposure flying on an airplane.

Description of background radiation and sources of it.

We get 99.9 % of our radiation from natural sources, called Natural Background Radiation.

I believe that if in the vacuum of space you place a blackbody object with (a) a constant (i.e., unchanging energy per unit time) internal thermal energy source, and (b) internal / surface thermal conduction properties such that independent of how energy enters the blackbody, the surface temperature of the blackbody is everywhere the same and you place that object in cold space (no background thermal radiation of any kind), eventually the object will come to a steady state condition — i.e., the object will eventually radiate energy to space at a rate equal to the rate of energy produced by the internal energy source.