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Monitoring of C-14 and tritium in the environment
Světlík, Ivo ; Michálek, V. ; Tomeš, Marek ; Tomášková, Lenka
In the invited lecture were presented C-14 and tritium time series and actual activity levels of these radionuclides in the environmental components (atmospheric CO2, precipitation, biota). Item there was discussed routines of low level activities measurement of this radionuclides by liquid scintillation spectrometry in the point of view of possible interferences and reduction of real detection levels.
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Stanovení C-14 ve vzorcích listů z okolí jaderných elektráren
Světlík, Ivo ; Tomeš, Marek ; Brabcová, Kateřina ; Michálek, V. ; Tomášková, Lenka
Carbon-14 is a radionuclide with global occurrence and partly natural origin. This radionuclide is a pure beta emitter with half-live 5730 years. The greatest present artificial source of radiocarbon are effluents from nuclear energy facilities, even though it is minor contribution in comparison with natural production. From all radionuclides released by Nuclear Power Plants (NPP) with Light Water Pressurized Reactor (LWPR) during normal operation, radiocarbon is responsible for major collective effective dose. During 2002 and 2003 samples of biota were collected in NPPs Temelín and Dukovany vicinity (both NPPs have only LWPR) and in reference background localities. Received results are compared and discussed in the point of view of NPPs influences on C-14 amount in the environment of close vicinity
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Příspěvek k dozimetrii a mikrodozimetrii na palubách kosmických lodí
Spurný, František
Onboard spacecraft radiation fields are composed mostly high energy charged particles with rather important component of heavier particles with high linear energy transfer (LET). Their biological effects are still not fully known, the studies of dosimetric and microdosimetric studies can therefore contribute significantly to deeper knowledge of effects mentioned. We started such studies many years ago. In this contribution results obtained onboard spacecraft during several last years are presented
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Odezva stopového LET spektrometru k vysokoenergetickým protonům
Jadrníčková, Iva ; Spurný, František
Risk from ionizing radiation depend both on the radiation quantity and the radiation quality.The radiation quality is characterized by the methods and the procedures of microdosimetry. Basic experimental microdosimetry approach is based on the use of tissue equivalent proportional counters. However, in some cases their use can be compromised, for example at high dose rates and/or in the presence of very intense low LET component in the radiation field to be characterized. For such purposes, the microdosimetry method based on a polyallyldiglycolcarbonate (PADC) chemically etched track-etch detectors (TED) was developed
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