نتایج جستجو برای: cosmic background radiation

تعداد نتایج: 1072268  

Journal: :iranian journal of radiation research 0
f. bouzarjomehri department of medical physics, and environmental health, shahid sadoghi university of medical sciences, yazd, iran m.h ehrampoush department of medical physics, and environmental health, shahid sadoghi university of medical sciences, yazd, iran

abstractbackground: there are relatively rich uranium mines in regions of saghand and bafgh in yazd province. this survey was carried out to provide a map of ambient gamma radiation of yazd province and the probable effects of the existence of these mines on background radiation dose rates.materials and methods: the measurements of the outdoor and indoor–environmental exposures (including cosmi...

Journal: :iranian journal of radiation research 0
t.v. ramachandran 19-a/201, verain, regency estate, kalyan – shill road near s.v. jondhele eng. college, dombivli(e) 421 202, thana dist, maharashtra, india

all living organisms are exposed to ionizing radiation comprising cosmic rays coming from outer space, terrestrial nuclides occurring in the earth’s crust, building materials, air, water and foods and in the human body itself. the exposures are constant and uniform for all individuals everywhere including the dose from ingestion of 40k in food. cosmic rays are, more intense at higher altitudes,...

Journal: :American Journal of Physics 1992

1997
G. F. Smoot D. Scott

The observed cosmic microwave background (CMB) radiation provides strong evidence for the hot big bang. The success of pri-mordial nucleosynthesis calculations (see Sec. 16, " Big-bang nucle-osynthesis ") requires a cosmic background radiation (CBR) characterized by a temperature kT ∼ 1 MeV at a redshift of z ≃ 10 9. In their pioneering work, Gamow, Alpher, and Herman [1] realized this and pred...

2000
RICHARD C. HENRY

I review the nature of the diffuse cosmic ultraviolet background radiation. The ultraviolet background is the last frontier: all the other diffuse backgrounds have been examined, at least at some level. The ultraviolet background has only begun to be explored; it offers rich promise of new astrophysical knowledge.

2008
F. A. Aharonian

The recent developments in studies of TeV radiation from blazars are highlighted and the implications of these results for derivation of cosmologically important information about the cosmic infrared background radiation are discussed.

Journal: :International Journal of Modern Physics A 1999

Journal: :La Rivista Del Nuovo Cimento Series 3 1994

2013

People living in the plateaus of Colorado or New Mexico receive about 1.5 mSv more per year than those living near sea level. The added dose from cosmic rays during a coast-to-coast round trip flight in a commercial airplane is about 0.03 mSv. Altitude plays a big role, but the largest source of background radiation comes from radon gas in our homes (about 2 mSv per year). Like other sources of...

1997
L. A. Anchordoqui M. T. Dova L. N. Epele

In this work we reexamine the opacity of the cosmic background radiation to the propagation of extremely high energy cosmic rays. We use the continuous energy loss approximation to provide spectral modification factors for several hypothesized cosmic ray sources. Earlier problems with this approximation are resolved including the effects of resonances other than the ∆.

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