Abstract
The natural production of radionuclides in the geosphere is of importance in studies of the residence time of old groundwater as well as in the determination of the migration rates of long-lived radio-nuclides from underground disposal sites of radioactive waste. Estimation of production rates of radionuclides originating in the spontaneous fission of uranium (e.g. {sup 81}Kr, {sup 129}I, {sup 99}Tc), or in reactions with thermal neutrons (e.g. {sup 36}Cl), has been described in a number of publications. The method of determining the neutron energy spectrum in various types of rock and the calculation of production rates and equilibrium concentrations of certain radionuclides are known for some elements. Estimation of the production of nuclides in nuclear reactions with fast neutrons in the rock formation is possible when the neutron energy distribution is known. One of the best possible approaches to this question is by application of a multigroup diffusion approximation. The main limitation of this estimation is the necessary assumption of the homogeneity of the distribution of all elements in the rock matrix. The mineralogical structure of the rock, as well as the fact that uranium and thorium-rich minerals are often concentrated close to the fracture zones and microfissures, plays an
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Citation Formats
Florkowski, T.
Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991.
IAEA: N. p.,
1991.
Web.
Florkowski, T.
Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991.
IAEA.
Florkowski, T.
1991.
"Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991."
IAEA.
@misc{etde_10111845,
title = {Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991}
author = {Florkowski, T}
abstractNote = {The natural production of radionuclides in the geosphere is of importance in studies of the residence time of old groundwater as well as in the determination of the migration rates of long-lived radio-nuclides from underground disposal sites of radioactive waste. Estimation of production rates of radionuclides originating in the spontaneous fission of uranium (e.g. {sup 81}Kr, {sup 129}I, {sup 99}Tc), or in reactions with thermal neutrons (e.g. {sup 36}Cl), has been described in a number of publications. The method of determining the neutron energy spectrum in various types of rock and the calculation of production rates and equilibrium concentrations of certain radionuclides are known for some elements. Estimation of the production of nuclides in nuclear reactions with fast neutrons in the rock formation is possible when the neutron energy distribution is known. One of the best possible approaches to this question is by application of a multigroup diffusion approximation. The main limitation of this estimation is the necessary assumption of the homogeneity of the distribution of all elements in the rock matrix. The mineralogical structure of the rock, as well as the fact that uranium and thorium-rich minerals are often concentrated close to the fracture zones and microfissures, plays an important role in the mechanism of neutron production yields and possibly in the production of {sup 239}Pu. Nevertheless, even this simplified approach is helpful in estimating the production rates of interesting nuclides. Refs, figs and tabs.}
place = {IAEA}
year = {1991}
month = {Sep}
}
title = {Natural production long-lived radionuclides in geological formations. Final report for the period 15 April 1988 - 31 August 1991}
author = {Florkowski, T}
abstractNote = {The natural production of radionuclides in the geosphere is of importance in studies of the residence time of old groundwater as well as in the determination of the migration rates of long-lived radio-nuclides from underground disposal sites of radioactive waste. Estimation of production rates of radionuclides originating in the spontaneous fission of uranium (e.g. {sup 81}Kr, {sup 129}I, {sup 99}Tc), or in reactions with thermal neutrons (e.g. {sup 36}Cl), has been described in a number of publications. The method of determining the neutron energy spectrum in various types of rock and the calculation of production rates and equilibrium concentrations of certain radionuclides are known for some elements. Estimation of the production of nuclides in nuclear reactions with fast neutrons in the rock formation is possible when the neutron energy distribution is known. One of the best possible approaches to this question is by application of a multigroup diffusion approximation. The main limitation of this estimation is the necessary assumption of the homogeneity of the distribution of all elements in the rock matrix. The mineralogical structure of the rock, as well as the fact that uranium and thorium-rich minerals are often concentrated close to the fracture zones and microfissures, plays an important role in the mechanism of neutron production yields and possibly in the production of {sup 239}Pu. Nevertheless, even this simplified approach is helpful in estimating the production rates of interesting nuclides. Refs, figs and tabs.}
place = {IAEA}
year = {1991}
month = {Sep}
}