| Abstract: | A sonde has been built for high-resolution measurement of natural or neutron-induced gamma rays in boreholes. The sonde is 7.3 cm in diameter and about 2.2 m in length and weighs about 16 kg. The lithium-compensated germanium semiconductor detector is stabilized at -185 to -188??C for as much as ten hours by a cryostatic reservoir containing melting propane. During periods when the sonde is not in use the propane is kept frozen by a gravity-fed trickle of liquid nitrogen from a reservoir temporarily attached to the cryostat section. A 252Cf source, shielded from the detector, may be placed in the bottom section of the sonde for anlysis by measurement of neutron-activation or neutron-capture gamma rays. Stability of the cryostat with changing hydrostatic pressure, absence of vibration, lack of need for power to the cryostat during operation, and freedom of orientation make the method desirable for borehole, undersea, space, and some laboratory applications. ?? 1972. |
| Genre: | Article |
| ProdID: | 70009763 |
| Citation Author: | Tanner, A. B.; Moxham, R. M.; Senftle, F. E.; Baicker, J. A. |
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| Citation End Page: | 7 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Nuclear Instruments and Methods |
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| Citation Number Of Pages: | 7 |
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| Citation Search Results Text: | A probe for neutron activation analysis in a drill hole using 252Cf, and a Ge(Li) detector cooled by a melting cryogen; 1972; Article; Journal; Nuclear Instruments and Methods; Tanner, A. B.; Moxham, R. M.; Senftle, F. E.; Baicker, J. A. |
| Citation Start Page: | 1 |
| Citation Volume: | 100 |
| Citation Year: | 1972 |
| Type: | citation/reference |
| Text: | A probe for neutron activation analysis in a drill hole using 252Cf, and a Ge(Li) detector cooled by a melting cryogen; 1972; Article; Journal; Nuclear Instruments and Methods; Tanner, A. B.; Moxham, R. M.; Senftle, F. E.; Baicker, J. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1972 00:00 -0600 |
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