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Radiation background of the dumps of some Donbass coal mines

100%

Vorobjov S. , Kredencer S. , Kudlenko V.

tom 10D

Testy akceptacyjne i dopuszczające dla systemu PDR

100%

Tervinder M. S. , Oborska-Kumaszyńska D. , Ratcliffe A.

tom Vol. 2, nr 3

123--128

Brachyterapia PDR jest znana i stosowana od początku lat 90. XX wieku, jednak w niewielu ośrodkach onkologicznych opublikowano wyniki leczenia nowotworów tą metodą. Podstawowym celem opracowania i wprowadzenia brachyterapii PDR było zastąpienie ciągłego napromieniania izotopami promieniotwórczymi o niskiej aktywności, stosowanymi w metodzie LDR, napromienianiem impulsami z określoną dla danego leczenia przerwą między nimi, przy zastosowaniu izotopów o wyższej aktywności (Rys. 1).

Studies of radioactive contaminations and heavy metal contents in vegetables and fruit from Lublin, Poland

100%

Chibowski S.

nr 4

In the paper the studies of the level of some gamma radioactive elements and heavy metals in fruit, vegetables and plants from Lublin town agglomeration are presented. Potassium 40K isotope was the most of all in the examined samples. It concentrated mainly in overground parts of some vegetables, for example in parsley and carrots haulm and in leaves of red beet and leek (from 1135 to 1940 Bq/kg). Considerably lower concentration of this element was noticed in the roots of the vegetables, ranging from 210 to 448 Bq/kg of the dry matter. In examined fruit, the 40K contents ranged from 490 to 510 Bq/kg. Transfer factors of 40K, from the soil to the vegetables and fruit, ranged from 0.3 to 2.9. The natural isotopes of uranium series gives about 17% of the total activity, whereas thorium series 19-20% of this activity. In fact, in examined fruit (raspberry, red and black currants) and roots of the vegetables the caesium 137Cs was not detected, whereas some amounts of it were noticed in green parts of vegetables, from 4.0 to 8.4 Bq/kg of the dry matter. The transfer factor of 137Cs from the soil to examined samples ranged from 0.03 to 0.4. In all studied samples, examined on heavy metal contents no valid safety standards for these elements were exceed.

Izotopy radioaktywne w badaniach nad absorpcją liściową

80%

I.V.

nr 05

Using nuclear power as alternative source

80%

Kalda G. , Kovtun I.

2009

tom z. 54 [266]

47-52

Paper represents perspectives for wider usage of nuclear power as one of the alternative sources. Paper studies nuclear reactions and their general principles, classification of various radioactive isotopes and chain reactions. Here are given calculations of thermal power, radioactive products power, changes of neutron current in reactor and irregularity factor of neutron current. Power reactors are classified: by neutron energy that initiates decomposition reaction as thermal reactors and speed ones; by usage of fuel as multiply reactors and converters: by their structure as heterogeneous and homogeneous reactors; by cooling and moderating types as water, heavy water, water-graphite, gas, channel and complex reactors.