Märksõna Kantserogeen 109 40 Raamatuid UDK otsingus märksõnadega põhjavesi ja kantserogeen ei leidunud. UDK: põhjavesi Märksõna: põhjavesi (213 kirjet) Ilona Juhanson, 123964YASB Ja Tartus (230 kirjet): Ilona Juhanson, 123964YASB Märksõna: kantserogeen (109 kirjet): Ja Tartus (40 kirjet): Ilona Juhanson, 123964YASB UDK: kantserogeen Ilona Juhanson, 123964YASB b) Olulise raamatu bibliokirje: Chemical and isotopic groundwater hydrology (c. 2004, 3rd ed) / Mazor, Emanuel TLÜAR loodusteaduste saali kojulaenutusosakonnas (kohaviit: LO 556/M23) Kasutasin märksõna põhjavesi. 1.2 Märksõna UDK Genoom 575.113 (051) Spektrofotomeetria 543.422.3 Orgaaniline süntees 547.057 (063) Komposiitmaterjalid 620.22-419.8 1.3
All of the natural elementsin the periodic table are present in cosmic rays, in roughly the same proportion as they occur in the solar system. But detailed differences provide a "fingerprint" of the cosmic ray's source. Measuring the quantity of each different element is relatively easy, since the different charges of each nucleus give very different signatures. Harder to measure, but a better fingerprint, is the isotopic composition (nuclei of the same element but with different numbers of neutrons). To tell the isotopes apart involves, in effect, weighing each atomic nucleus that enters the cosmic ray detector. About 90% of the cosmic ray nuclei are hydrogen (protons), about 9% are helium (alpha particles), and all of the rest of the elements make up only 1%. Even in this one percent there are very rare elements and isotopes. These require large detectors to collect enough particles to say something
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