24 research outputs found
Protonnyalábos mikromegmunkálás = Proton beam Micromachinig
A tĂ©ma keretĂ©ben a mikromegmunkálás mĂłdszerĂ©t telepĂtettĂĽk az ATOMKI pásztázĂł proton mikroszondájához. Második lĂ©pĂ©sben kĂĽlönbözĹ‘ nyomdetektor Ă©s más reziszt anyagokat vizsgáltunk a mikromegmunkálás szempontjábĂłl. A megmunkált anyagok kĂĽlönbözĹ‘ jellemzĹ‘it vizsgáltuk a besugárzási paramĂ©terek fĂĽggvĂ©nyĂ©ben. Az előállĂtott eszközök (mikrostruktĂşrák) alkalmazási lehetĹ‘sĂ©geit fel kĂvántuk kutatni, mikrostruktĂşrákat állĂtottuk elĹ‘ demonstráciĂłs Ă©s konkrĂ©t alkalmazási cĂ©lbĂłl. A világon második kutatĂłcsoport lettĂĽnk e tĂ©mában, szerepĂĽnk azonban nem másodrendű. Kihasználva saját adottságainkat, a nemzetközi irodalomhoz Ăşj kutatási eredmĂ©nyekkel járultunk hozzá. Az ATOMKI pásztázĂł proton mikroszondája Ăgy egy Ăşj, perspektivikus alkalmazási terĂĽletet nyert. | We have installed the Proton Beam Micromachining (PBM) / P-beam Writing (PBW) method on the Scanning Nuclear Microprobe of ATOMKI. We have investigated various solid state nuclear track detector and other resist materials for micromachining properties. We have characterized various properties of materials as a function of irradiation parameters. We have explored the potential application areas of the produced microstructures. We have created products for demonstration and real application purposes. We became the second research group in the world in this field, but our role is not of secondary importance. Exploiting our resources, we have added new scientific results to the literature. The Scanning Nuclear Microprobe of ATOMKI has gained a new, prosperous application area
Radon and radium content of thermal and mineral water
A mĂ©lyben lĂ©vĹ‘ zavartalan vĂzbázisok minden ország megbecsĂĽlt termĂ©szeti kincsei. A hĂ©vizek Ă©s ásványvizek vizek több nagyságrendnyi tartományban változĂł radioaktivitása döntĹ‘en a geolĂłgiai környezetben felvett radontĂłl Ă©s rádiumtĂłl ered. Ezen alfa-radioaktivitást hordozĂł elemek egyrĂ©szt nyomjelzĹ‘i a mĂ©lysĂ©gi vizek transzportfolyamatainak, másrĂ©szt a lakossági sugárterhelĂ©s egyik fontos összetevĹ‘jĂ©t kĂ©pezik a kiemelkedĹ‘ aktivitásĂş vizek felhasználĂłinak körĂ©ben.
Dolgozatomban, a MTA AtommagkutatĂł IntĂ©zetĂ©nek Radon Csoportjában, vĂzminták 222Rn- Ă©s 226Ra-tartalmának meghatározására szolgálĂł maratottnyom-detektoros mĂłdszer meghatározĂł hozzájárulásommal vĂ©gzett fejlesztĂ©sĂ©nek eredmĂ©nyeirĹ‘l számoltam be, valamint bemutattam a mĂłdszer alkalmazása során kapott hazai Ă©s kĂĽlföldi felszĂnalatti vĂzminták radon- Ă©s rádiumtartalom meghatározásának Ă©s a fogyasztásuk által okozott járulĂ©kos sugárterhelĂ©s becslĂ©sĂ©nek eredmĂ©nyeit.
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Radioactivity of thermal and mineral waters, which may vary over several orders of magnitude, is mainly due to the radon and radium originating from the geological environment. Radon and radium content of waters may be interesting from different points of view. Firstly, waters with high activity may contribute significantly to the public radiation exposures. Secondly, radon and radium can be useful in tracing underground water transport.
From the public health point of view, the investigation of the radon and radium content of drinking and mineral waters and the estimation of their contribution to the radiation exposure are our current tasks nowadays. People have had an increasing interest in the comsumption of bottled mineral waters due to the wordwilde decrease of good quality drinking waters. The consumption of mineral waters is significantly increasing from year to year in Europe and in Hungary, as well. Both drinking and natural mineral waters originate from different aquifers, situated at different depths below the surface. Thus, they represent a wide variety of mineral and radionuclide content, and sometimes extremely high values can also be observed. The daily consumption of mineral waters with high 226Ra content and of waters with high 222Rn content may have a significant contribution to the internal natural radiation exposure of the population. For this reason, the permissible activity concentration of radium and radon in drinking waters is limited in numerous countries. However, in Hungary there are no limitations, and even relating measurements of radioactivity of mineral waters were very occasional, and many of them took place only in the last years.
222Rn and 226Ra isotopes can be found in the environment in trace amounts, but due to their radioactivity they are easily measurable. Consequently, they are favourable natural tracers of near-surface and underground water transports. The 226Ra content of natural waters can give information related to their origin, mixing and underground path. Moreover, the 226Ra content of waters flowing from recultivated uranium vaste dumps and troughs can indicate directly the state of the covering layer. It is obvious that a simple, low-cost and reliable radium measuring method in permitting a large number of measurements is of great value, because an increasing interest in radioactivity determinations of natural waters can be expected in the very near [email protected]