Evolving stellar background radiation and gamma-ray optical depth

<p>The BSUIN (Baltic Sea Underground Innovation Network) aims to enhance the accessibility of the underground laboratories in the Baltic Sea region for innovation, business and science. One of the BSUIN project activities is characterization of natural background radiation (NBR) in underground facilities. In this talk results from NBR measurements performed in Callio Lab, Pyh&#228;salmi, Finland, at the depth of 4100 m w.e. will be presented. The in-situ gamma spectra were collected with the use of&#160; HPGe semiconductor spectrometer, whereas the &#160;concentration of radon were measured with RAD7 electronic detector. In addition, the water and rock samples were taken for laboratory analysis in Institute of Physics, University of Silesia, Poland. The concentration radioisotopes in water samples were performed by using a liquid scintillation &#945;/&#946; counter (LSC) and &#945;-particle spectrometry, while the concentration of radioisotopes in rock samples were performed by using laboratory gamma ray spectrometry and also &#945;-particle spectrometry.</p>

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Determination the Index of Radioactive Risk In The Batang Kuantan River

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i2.13.18133 ◽

2018 ◽

Vol 7 (2.13) ◽

pp. 429

Author(s):

Rindi Genesa Hatika ◽

Indang Dewata ◽

Alizar . ◽

Purwo Subekti ◽

Saiful Anwar

Keyword(s):

Gold Mining ◽

Gamma Ray ◽

Background Radiation ◽

Raw Materials ◽

Environmental Damage ◽

Gamma Ray Spectrometry ◽

Mining Activities ◽

Radioactive Elements ◽

Limit Value ◽

Decay Series

NORM is a material containing radioactive elements that exist naturally. All minerals and raw materials contain radionuclides from nature, most important for radiation protection purposes are the U-238, Th-232 and K-40 decay series. This element naturally grows and is considered a major contributor to the annual individual background radiation dose. Therefore, each individual can be exposed to NORM through various activities they do, one of which is gold mining activities. Gold mining in addition to causing exposure to NORM, is believed also can cause significant environmental damage. This study aims to determine the index of radioactive risks that resulted from gold mining activities in the batang kuantan river. The sample used for this research is soil from batang kuantan river which then analyzed using gamma ray spectrometry. The results show that the index of radioactive risk value indicated by all soil samples in the batang kuantan river is still below the predetermined maximum limit value.

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On the determination of the cosmic infrared background radiation from the high-energy spectrum of extragalactic gamma-ray sources

The Astrophysical Journal ◽

10.1086/174943 ◽

1994 ◽

Vol 436 ◽

pp. 696 ◽

Cited By ~ 47

Author(s):

Eli Dwek ◽

Jonathan Slavin

Keyword(s):

Energy Spectrum ◽

Gamma Ray ◽

Background Radiation ◽

High Energy ◽

Infrared Background ◽

Cosmic Infrared Background

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Evolution of the Extragalactic Infrared-to-Ultraviolet Background and Gamma-Ray Attenuation

Symposium - International Astronomical Union ◽

10.1017/s0074180900225990 ◽

2001 ◽

Vol 204 ◽

pp. 153-153

Author(s):

T. M. Kneiske ◽

K. Mannheim

Keyword(s):

Star Formation ◽

Gamma Rays ◽

Gamma Ray ◽

Background Radiation ◽

Formation Rate ◽

Cosmological Parameters ◽

Cosmic Background Radiation ◽

Initial Mass Function ◽

Order Unity ◽

Gamma Ray Attenuation

We describe a model for the evolution of the cosmic background radiation field from infrared to ultraviolet wavelengths tuned to observations of star formation and including the effects of reprocessing by dust and gas. With this model, we can compute the attenuation of gamma rays from extragalactic sources. The attenuation length for the vast majority of extragalactic gamma-ray sources (blazars and gamma-ray bursts at redshifts of order unity) depends on the evolving optical-to-ultraviolet background, whereas gamma-ray attenuation measurements of nearby sources-such as Mrk 501 probe the infrared background. We focus on the cosmological aspects of the model and discuss the effects of changing cosmological parameters, star formation rate, initial mass function, and dust opacity on the resulting gamma-ray attenuation. A plausible choice of parameters leads to fair agreement between our model in the infrared and the observed attenuation of gamma rays from Mrk 501.

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GAMMA DOSE RATES IN THE HIGH BACKGROUND RADIATION AREA OF MANGALORE REGION, INDIA

Radiation Protection Dosimetry ◽

10.1093/rpd/ncz063 ◽

2019 ◽

Vol 184 (3-4) ◽

pp. 290-293 ◽

Cited By ~ 1

Author(s):

Darwish Al-Azmi ◽

Sudeep Kumara ◽

M P Mohan ◽

N Karunakara

Keyword(s):

Gamma Ray ◽

Background Radiation ◽

Gamma Dose ◽

Natural Background ◽

High Background ◽

Natural Background Radiation ◽

Dose Rates ◽

Gamma Dose Rates ◽

High Background Radiation Area ◽

Normal Background

Abstract Elevated levels of natural background radiation due to scattered patches of monazite sand around the beaches of Mangalore, India, have been reported earlier. A comparative study of gamma dose rates was performed in both normal background and high natural background radiation areas around Mangalore using different types of portable gamma dosimeters. In addition to this, gamma-ray energy spectra were acquired, in situ, using a NaI(Tl) based portable gamma spectrometer. Soil and sand samples were collected for laboratory analysis with HPGe detectors. Measurements were carried out during the years 2016–18 revealed that in majority of the locations the gamma dose rates were similar to the normal background regions, whereas, in certain locations the dose rates were higher with values up to 530 nSv/h.

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