| 1. |
- Doe, T.W., et al.
(författare)
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Results and conclusions of stress measurements at Stripa
- 1983
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Konferensbidrag (refereegranskat)abstract
- This paper describes the results of stress measurements at Stripa, compares the results obtained by different techniques, and recommends a stress measurement program for a hard rock repository site. The state of stress at the Stripa Mine has been measured both in a 381-m-deep hole drilled from the surface and in holes drilled from the drifts underground. Hydraulic fracturing and several overcoring methods have been used (Lulea triaxial gauge, CSIRO gauge, USBM gauge, Swedish State Power Board deep-hole Leeman triaxial gauge). The results of overcoring and hydraulic fracturing agree well, particularly for the magnitude and orientation of the greatest stress. A recommended program for stress measurement at a repository site would include hydraulic fracturing and deep-hole overcoring in a deep hole drilled from surface, and overcoring (Lulea gauge and USBM gauge) and hydraulic fracturing from holes drilled from underground openings when access is available. Propagation of the hydraulic fractures should be monitored acoustically to determine their location and orientation.
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| 2. |
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| 3. |
- Leijon, Bengt, et al.
(författare)
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Stress measurements in Näsliden mine
- 1981
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Ingår i: Application of rock mechanics to cut and fill mining. - London : The Institution of Mining and Metallurgy. - 0900488603 ; , s. 162-168
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Konferensbidrag (refereegranskat)
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| 4. |
- Möller, Bengt, et al.
(författare)
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Lead Levels Determined in Swedish Permanent Teeth by Particle-Induced X-Ray Emission
- 1982
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Ingår i: Scandinavian Journal of Work, Environment and Health. - 0355-3140. ; 8:4, s. 267-272
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Tidskriftsartikel (refereegranskat)abstract
- The determination of lead in permanent teeth is a useful measure of past exposure in early childhood since these teeth are mineralized in early childhood. Particle-induced X-ray emission (PIXE) analysis has been shown to be a method with good applicability for the contamination-free analysis of elements heavier than calcium in dental hard tissues. The method is rapid and nondestructive. The purpose of this study, which used the PIXE technique, was to survey the average level of lead in the coronal dentin of permanent bicuspid teeth collected in three places representing Swedish urban and rural areas. In addition teeth from the New York City area were analyzed. The material comprised 165 teeth from Sweden and, for comparison, 14 teeth from New York City. The median value of lead in the Swedish teeth was 2.9 micrograms/g, a value indicating an insignificant influence from the environment in comparison to the New York teeth, for which the median value was 9.2 micrograms/g. There was however a statistically significant difference in the lead concentration of teeth from large and small Swedish cities; this finding may reflect different automobile traffic intensity.
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| 5. |
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