Wyniki wyszukiwania - Biblioteka Nauki

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Pomiary 60Co w obiektach z żelazną matrycą

100%

Tymiński Z. , Dziel T. , Saganowski P. , Kołakowska E. , Listkowska A. , Tymińska K. , Żołądek P. , Olech A.

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tom 7

144-150

EN

Radioactive cobalt isotope 60Co is produced in neutron activation process of stable isotope 59Co by neutron capture reaction 59Co(n,g)60Co, in solar wind charge exchange 60Ni(n,p)60Co or in spallation process 62Ni(n,p2n)60Co. These processes are responsible for isotope 60Co production either in nuclear reactor on Earth or beyond – in stars and in meteorites (induced by cosmic rays). In this work the results of 60Co measurements in metal sources by gamma spectrometry laboratory are presented. A metal reference radioactive standards made up of steel cast with discs shaped geometries and different diameters have been tested in gamma-ray spectrometry measurement system. The reference activity concentrations of 60Co were in the range of (0.291±0.010) Bq·g–1 to (1.544±0.030) Bq·g–1. The mean minimal detectable activities (MDA) obtained by series of the 6 to 18 hours lasting measurements of described above standards with HPGe detectors carried out in NCBJ OR POLATOM were in the range of 6.1 mBq·g–1 to 8.5 mBq·g–1. The results correspond to the values of 60Co activity concentration measured in the iron meteorites with young terrestrial ages.

2

Raport z poszukiwań meteorytów w ramach PFN w sezonie 2016/2017

80%

Tymiński Z. , Żołądek P. , Wiśniewski M. , Stolarz M. , Jaśkiewicz A. , Myszkiewicz M. , Gawroński M. P. , Suchodolski T. , Polakowski K. , Zaręba P. , Olech A.

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2018

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tom 9

158-163

EN

The Meteorite Section was created in 2010 on demand of Polish Fireball Network (PFN) for the meteorite searching and investigation purposes. The main task of the Section is to find the meteorites dropped from bolides registered by the Polish Fireball Network. Each year, the PFN registers several meteorite falls within our country and meteorite strewnfield inspections must be carried out at least for the masses of above 300 g estimated with the PyFN software. Only last year the PFN organized several search campaigns. Two of them are presented in the publication.

3

Raport z poszukiwań meteorytów w ramach PFN w sezonie 2016/2017

80%

Tymiński Z. , Żołądek P. , Wiśniewski M. , Stolarz M. , Jaśkiewicz A. , Myszkiewicz M. , Gawroński M. P. , Suchodolski T. , Polakowski K. , Zaręba P. , Olech A.

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2018

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tom 9

EN

The Meteorite Section was created in 2010 on demand of Polish Fireball Network (PFN) for the meteorite searching and investigation purposes. The main task of the Section is to find the meteorites dropped from bolides registered by the Polish Fireball Network. Each year, the PFN registers several meteorite falls within our country and meteorite strewnfield inspections must be carried out at least for the masses of above 300 g estimated with the PyFN software. Only last year the PFN organized several search campaigns. Two of them are presented in the publication.

4

Raport PFN z poszukiwań meteorytów w latach 2018–2020

71%

Tymiński Z. , Żoładek P. , Wiśniewski M. , Stolarz M. , Polakowski K. , Jaśkiewicz A. , Janasz S. , Gawroński M. P. , Krzyżanowski T. , Kwinta M. , Olech A. , Piatlicki J. , Suchodolski T. , Szlagor M. , Węgrzyk W. , Zaręba P. , Zelevich J.

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tom 12

98-107

EN

Since 2010, the Meteorite Section of the Comet and Meteor Workshop (PKiM) has been systematically organizing exploratory expeditions to selected meteorite strewn fields, calculated from bolides registered with the Polish Fireball Network (PFN). Some of the expeditions organized in the period of 2018–2020, after the phenomena PF140118, PF070119, EN050120 and PF310720 are reported. All these phenomena have a common feature, they reach beyond the borders of Poland – either the analysis was developed in cooperation with the European Fireball Network (EN) or the meteorite fall took place abroad. It is clear that meteor phenomena have no boundaries and for positive research results in near-Earth space science a European cooperation is highly recommended. Many meteorites fallen from the bolides registered in the PFN are still in the strewn field waiting to be discovered. The article presents a study of the most important phenomena happened in two last years, and it is also a hint where to look for meteorites in Europe.