Radionucleotides
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Catégorie :Category: nCreator TI-Nspire
Auteur Author: bob de bauwer
Type : Classeur 3.0.1
Page(s) : 1
Taille Size: 1.79 Ko KB
Mis en ligne Uploaded: 03/03/2025 - 22:46:23
Mis à jour Updated: 03/03/2025 - 23:46:39
Uploadeur Uploader: daveboy2000 (Profil)
Téléchargements Downloads: 3
Visibilité Visibility: Archive publique
Shortlink : http://ti-pla.net/a4523307
Type : Classeur 3.0.1
Page(s) : 1
Taille Size: 1.79 Ko KB
Mis en ligne Uploaded: 03/03/2025 - 22:46:23
Mis à jour Updated: 03/03/2025 - 23:46:39
Uploadeur Uploader: daveboy2000 (Profil)
Téléchargements Downloads: 3
Visibilité Visibility: Archive publique
Shortlink : http://ti-pla.net/a4523307
Description
Fichier Nspire généré sur TI-Planet.org.
Compatible OS 3.0 et ultérieurs.
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3. a. Name two terre3. a. Name two terrestrial radionuclides. K-40, Rb-87, U-235, U-238, Th-232, Ra-226, Rn-222, Po-210, Pb-210 (2 points) a(2) name two cosmogenic radionuclides. H-3, Be-7, Be-10, C-14, Na-22 a(3) name two anthropogenic radionuclides. I-131, Cs-137, Sr-90, Xe-133 b. Explain why the average dose rate from background radiation is about three times smaller in the Netherlands than in Sweden Because in Sweden the bedrock contains more terrestrial radionuclides (uranium, thorium and daughter products) than in the Netherlands (2 point) c. Explain why the mobility and bioavailability of radiocaesium decreases with time in the first years following initial deposition. Like potassium, caesium is fixed due to specific adsorption to illitic clay minerals (2 points) Ceasium-137 decays with a half life of 30.17 years. e. Calculate the first order decay rate constant in years-1 » = ln2/T½ = 0.693/30.17 = 0.023 years-1 (4 points) f. Given an initial amount of of 1 g of Cs-137, calculate the amount of Cs-137 that remains after 100 years. Cs-137(100 y) = 1*exp(-»*t) = exp(-0.023*100) = exp(-2.297) = 0.101 g (5 points) Made with nCreator - tiplanet.org
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Compatible OS 3.0 et ultérieurs.
<<
3. a. Name two terre3. a. Name two terrestrial radionuclides. K-40, Rb-87, U-235, U-238, Th-232, Ra-226, Rn-222, Po-210, Pb-210 (2 points) a(2) name two cosmogenic radionuclides. H-3, Be-7, Be-10, C-14, Na-22 a(3) name two anthropogenic radionuclides. I-131, Cs-137, Sr-90, Xe-133 b. Explain why the average dose rate from background radiation is about three times smaller in the Netherlands than in Sweden Because in Sweden the bedrock contains more terrestrial radionuclides (uranium, thorium and daughter products) than in the Netherlands (2 point) c. Explain why the mobility and bioavailability of radiocaesium decreases with time in the first years following initial deposition. Like potassium, caesium is fixed due to specific adsorption to illitic clay minerals (2 points) Ceasium-137 decays with a half life of 30.17 years. e. Calculate the first order decay rate constant in years-1 » = ln2/T½ = 0.693/30.17 = 0.023 years-1 (4 points) f. Given an initial amount of of 1 g of Cs-137, calculate the amount of Cs-137 that remains after 100 years. Cs-137(100 y) = 1*exp(-»*t) = exp(-0.023*100) = exp(-2.297) = 0.101 g (5 points) Made with nCreator - tiplanet.org
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