Sentences with phrase «about background radiation»

Not exact matches

«Long ago and far away there was a dot that expanded rapidly into the universe...» that in itself is a leap in logic my friend... many assumptions made about cosmic background radiation that we know very little about.

How about cosmic microwave background radiation, time dilation in supernovae light curves, the Hubble deep field, the Sunyaev - Zel «dovich effect, the Integrated Sachs - Wolfe effect, the hom.ogeneity of stars and galaxies, etc, etc...

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.

Embedded in this cosmic microwave background (CMB) radiation are hints aplenty about the universe in its infancy.

Called the cosmic microwave background (CMB) radiation, this afterglow was produced about 370,000 years after the big bang when the first atoms formed and has been studied in great detail by satellites, such as NASA's WMAP probe.

The fliers in this nebula, which appear as two red blobs against a pale green background of radiation, seem to be moving fast enough — about 100,000 miles per hour — to fit Balick's original theory, but they also have backward - pointing bow shocks, as though an even faster wind were coming from behind and pushing past them.

According to standard physics, cosmic rays created outside our galaxy with energies greater than about 1020 electronvolts (eV) should not reach Earth at those energies: as they travel over such vast regions of space they should lose energy because of collisions with photons of the cosmic microwave background (CMB), the radiation left over from the big bang.

A typical nuclear medicine procedure may impart a radiation dose to the patient comparable to about one to four years of natural background radiation depending on the type of study.1 As with X-rays, the value of diagnostic imaging is great and the risks are negligible compared to the health benefits of having the procedure.

While we may not be able to do much about air pollution or background radiation, let's look at the factors we can control in more detail.

The additional exposures received by most Japanese people in the first year and subsequent years due to the radioactive releases from the accident are less than the doses received from natural background radiation (which is about 2.1 mSv per year).

The cosmic background radiation is about 3K so without somehow shading a surface against the warm glow left over from the big bang that's as cold as it gets.

The biggest increase in background radiation levels world wide was during the peak of atmospheric weapons testing during the 1960s raising the level by about 5 %.

He was right about so many things — the background nineteenth - century CO2 concentration level and its increase over the twentieth century; the importance of high - quality temperature data and the warming trend observed over much of his lifetime; the infrared spectroscopy of CO2 and its effect on «sky radiation»; and more.

But, if we leave the fission products alone for a few hundred years, they will decay to normal background levels of radiation (Safe enough we don't need to worry about them as much).

And remember, we are talking about an additional radiation exposure in the realm of 0.0002 mSv for those living near a nuclear power plant, versus a background level of 2 to 4 mSv (depending on where you live) due to everything from cosmic rays to ground - derived radon emission to eating bananas (this last one gives you more radiation than the NPP).