Transient radioactive equilibrium of 121mTe and 121Te and determination of their half-lives

2019 ◽  
Vol 148 ◽  
pp. 262-269
Author(s):  
G. Jörg
Keyword(s):  
Radioactive Equilibrium

scholarly journals Dating mortar by optically stimulated luminescence: A feasibility study

2011 ◽  
Vol 38 (1) ◽  
pp. 42-49 ◽  
Author(s):  
Christian Goedicke
Keyword(s):  
Dose Rate ◽  
Short Range ◽  
Optically Stimulated Luminescence ◽  
Radioactive Equilibrium ◽  
Lime Mortar ◽  
Modulation Techniques ◽  
Single Grain ◽  
Optical Bleaching ◽  
Number Of Publications

AbstractQuartz is the datable component in mortar. Although its luminescence properties are very well studied, the problem of mortar dating arises from a low level of optical bleaching. In order to reduce the time consuming efforts for dating lime mortar in monuments by optically stimulated luminescence, we investigated the most suitable methods of dose and dose rate determination, and we explored tests which are suitable to predict the datability of a given material. Reverting to the large number of publications on sedimentary partially bleached quartz we found linear modulation techniques especially useful, equally we also recommend the determination of the level of optical depletion before starting analyses. Single grain analysis is regarded as an ultimate but infallible tool to date very poorly bleached quartz from mortar. Dose rate measurements need to take into account the radioactive equilibrium of the uranium decay and the short range inhomogeneity of the environmental gamma radiation field: gamma spectrometry and on-site TLD measurements are best suited.

scholarly journals EXPERIMENTAL DETERMINATION OF THE RADIOACTIVE EQUILIBRIUM COEFFICIENT BETWEEN RADIONUCLIDES OF THE URANIUM DECAY CHAIN.

2021 ◽  
Vol 103 (11) ◽  
pp. 801-804
Author(s):  
Tursunboy Izzatillo ugli Soliyev ◽  
◽  
Amrullo Mustafoyevich Muzafarov ◽  
Bahriddin Faxriddinovich Izbosarov ◽  
◽  
...  
Keyword(s):  
Experimental Determination ◽  
Decay Chain ◽  
Radioactive Equilibrium

Determination of uranium in rocks with disturbed radioactive equilibrium by means of ? spectrometry

1981 ◽  
Vol 50 (2) ◽  
pp. 142-144
Author(s):  
Fam Zui Khien ◽  
Nguyen Tat To ◽  
Nguyen Van Do
Keyword(s):  
Radioactive Equilibrium

Radiochemical Determination of Strontium-90

1963 ◽  
Vol 46 (3) ◽  
pp. 371-380
Author(s):  
John H Harley
Keyword(s):  
Small Mass ◽  
Radioactive Equilibrium ◽  
Strontium 90 ◽  
Dry Ashing ◽  
Activity Yield ◽  
Radiochemical Determination ◽  
Bulk Matrix ◽  
Agricultural Materials ◽  
Yttrium 90

Abstract Detailed procedures have been developed for strontium-90 in foods and agricultural materials. Sr-90 must be isolated from the bulk matrix of the sample, generally by wet or dry ashing followed by chemical or ion exchange. Non-radioactive Sr is added as a carrier because of the small mass of Sr-90. Final determination is made by letting Sr-90 and yttrium-90 attain radioactive equilibrium, separating the Y-90, and measuring its activity. Yield is determined radiometrically with Sr-85 tracer. Sr-89 is determined at the same time by the same radiochemical procedures, except that the yield is determined gravimetrically.

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.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

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