scholarly journals Determination of radon emanation for phosphogypsum produced in Serbia

2021 ◽  
Author(s):  
Predrag Kuzmanović ◽  
Igor Čeliković ◽  
Sofija Forkapić ◽  
Nataša Todorović ◽  
Leposava Filipović Petrović ◽  
...  
Keyword(s):  
Radon Emanation

Determination of the radon emanation fraction from rocks by simple gamma-ray spectrometry

2018 ◽  
Vol 316 (3) ◽  
pp. 1307-1312 ◽  
Author(s):  
Kil Yong Lee ◽  
Sang Ho Moon ◽  
Yong Hwa Oh ◽  
Kyucheol Ha ◽  
Kyung Seok Ko
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
Radon Emanation ◽  
Emanation Fraction

Determination of radon emanation and back diffusion characteristics of building materials in small chamber tests

1997 ◽  
Vol 32 (4) ◽  
pp. 355-362 ◽  
Author(s):  
Christopher Y.H. Chao ◽  
Thomas C.W. Tung ◽  
Daniel W.T. Chan ◽  
John Burnett
Keyword(s):  
Building Materials ◽  
Radon Emanation ◽  
Back Diffusion ◽  
Small Chamber ◽  
Diffusion Characteristics

scholarly journals A Study of Greek Building Materials as Indoor Radon Sources

2020 ◽  
Vol 4 ◽  
pp. 180
Author(s):  
A. Savidou ◽  
C. Raptis ◽  
P. Kritidis
Keyword(s):  
Building Materials ◽  
Gamma Ray ◽  
Indoor Radon ◽  
Radon Emanation ◽  
Single Measurement ◽  
Radon Exhalation ◽  
Short Time ◽  
High Resolution Gamma Spectrometry ◽  
Continuous Accumulation

A survey of radon emanation in building materials commonly used in Attica has initiated at our laboratory as part of a broader EU program. The objective is to obtain a characterisation of the Greek building materials as indoor radon sources and identify the cases where some specific countermeasures should be applied. Up to now, bricks commonly used in Attica have been studied for both radium content and radon emanation. Gamma-ray spectroscopy techniques, as well as radon exhalation measurements, have been employed. For determination of radon exhalation rate, besides the trivial method which consist of a single measurement of radon concentration in a closed vessel containing the sample, a short-time continuous accumulation/counting method has been established. The results of exhalation measurements have been used together with high-resolution gamma-spectrometry in order to determine radon emanation coefficients.

Determination of the radon emanation fraction from phosphogypsum using LSC

2011 ◽  
Vol 291 (1) ◽  
pp. 197-200 ◽  
Author(s):  
Kil Yong Lee ◽  
Soo Young Cho ◽  
Yoon Yeol Yoon ◽  
Young Nam Jang
Keyword(s):  
Radon Emanation ◽  
Emanation Fraction

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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