The in situ production of radioisotopes in rock matrices with particular reference to the Stripa granite

Details The in situ production of radioisotopes in rock matrices with particular reference to the Stripa granite The in situ production of radioisotopes in rock matrices with particular reference to the Stripa granite

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1803a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 8, pp.1803-1815

Computer Science

11

Scientific paper

The in situ production of 3 H, 14 C, 36 Cl, 129 I, 37 Ar, 39 Ar, 81 Kr and 85 Kr by neutron-induced reactions and spontaneous nuclear decay processes has been estimated within the Stripa granite, its associated fracture minerals and surrounding leptite. Experimental measurements of the neutron flux within the Stripa granite are within 15% of theoretical values and have been used to calculate neutron-induced production rates. Activities of radionuclides that may enter groundwaters from the rock matrix are discussed in relation to their initial distribution in the host rock and their subsequent release into solution. The measured radioactivities in groundwaters from the high radioélément-content granites at Stripa are compared with estimates of their in situ production within the granite and of their solution by fracture-borne fluids. The activities of 3 H and 14 C which enter fracture fluids from the rock matrix are close to present detection limits. For 3 H, the most significant production is within the rock matrix whilst for 14 C it is within the circulating fracture fluids. Chlorine-36 production by neutron-capture within the granite is much more significant than inputs from cosmogenic and nuclear fallout sources. The 36 Cl / Cl ratio may be used to evaluate Cl - sources in saline groundwaters. In situ production of 129 I by spontaneous fission of 238 U is an important source of 129 I in the high radioactivity Stripa granite. Argon-37, 39 Ar and 85 Kr are produced by in situ reactions within the rock matrix, fracture mineralisation and at the sites of U-mineralisation, respectively. The use of some cosmogenic radionuclides for the estimation of groundwater residence times may be limited because of in situ production.

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