scholarly journals Evolving stellar background radiation and gamma-ray optical depth

2001 ◽  
Author(s):  
Tanja M. Kneiske
Keyword(s):  
Optical Depth ◽  
Gamma Ray ◽  
Background Radiation ◽  
Stellar Background

scholarly journals Characteristics of natural radiation background at the Callio Lab (Finland) performed within the BSUIN project

2020 ◽  
Author(s):  
Jan Kisiel ◽  
Kinga Polaczek-Grelik ◽  
Katarzyna Szkliniarz ◽  
Agata Walencik-Łata ◽  
Jari Joutsenvaara ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Gamma Ray ◽  
Background Radiation ◽  
Gamma Ray Spectrometry ◽  
Radiation Background ◽  
Rock Samples ◽  
Baltic Sea Region ◽  
Semiconductor Spectrometer ◽  
The Baltic

<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, Pyhäsalmi, Finland, at the depth of 4100 m w.e. will be presented. The in-situ gamma spectra were collected with the use of  HPGe semiconductor spectrometer, whereas the  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 α/β counter (LSC) and α-particle spectrometry, while the concentration of radioisotopes in rock samples were performed by using laboratory gamma ray spectrometry and also α-particle spectrometry.</p>

scholarly journals Determination the Index of Radioactive Risk In The Batang Kuantan River

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.  

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

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.

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

2019 ◽  
Vol 184 (3-4) ◽  
pp. 290-293 ◽  
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.

Measurements of gamma-ray background radiation in Pyhäsalmi mine

2020 ◽  
Vol 161 ◽  
pp. 109166
Author(s):  
S. Pohuliai ◽  
A. Sokolov ◽  
V. Gostilo ◽  
J. Joutsenvaara ◽  
J. Puputti
Keyword(s):  
Gamma Ray ◽  
Background Radiation

THE BLAZAR SEQUENCE AND THE COSMIC GAMMA-RAY BACKGROUND RADIATION IN THEFERMIERA

2009 ◽  
Vol 702 (1) ◽  
pp. 523-536 ◽  
Author(s):  
Yoshiyuki Inoue ◽  
Tomonori Totani
Keyword(s):  
Gamma Ray ◽  
Background Radiation
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