TY - JOUR
T1 - Studies of the production rate of cosmic-ray produced 14C in rock surfaces
AU - lull, A. J.T.
AU - Lifton, N.
AU - Phillips, W. M.
AU - Quade, J.
N1 - Funding Information:
We are grateful to T.E. Cerling for useful discussions. We thank T.E. Lange and A.L. Hatheway for technical assistanceT. his work was supportedb y NSF grant EAR92-003883a nd NASA grant NAGW 3614.
PY - 1994/6/3
Y1 - 1994/6/3
N2 - We have developed a method of extracting 14C in rock samples which is produced by the direct spallation of oxygen in the rock. The low levels of 14C produced in rocks, approximately 106 atoms/g of rock at an altitude of 2000 m, are detectable only by accelerator mass spectrometry (AMS). This radioisotope can be extracted from the rock by melting in an rf furnace in a flow of oxygen, and earlier work has discussed this in some detail. Several improvements have been made to this system, allowing for processing of up to 100 g of rock sample at one time, and reduction of the blank. Our measurements from Tabernacle Hill, Utah, an intermediate-altitude basalt with well-constrained conventional 14C ages, yield an estimated cosmogenic 14C production rate of about 50 14C atoms/g/yr. When corrected to sea level we obtain a value of 20 ± 2 14C/g/yr for high-latitude samples.
AB - We have developed a method of extracting 14C in rock samples which is produced by the direct spallation of oxygen in the rock. The low levels of 14C produced in rocks, approximately 106 atoms/g of rock at an altitude of 2000 m, are detectable only by accelerator mass spectrometry (AMS). This radioisotope can be extracted from the rock by melting in an rf furnace in a flow of oxygen, and earlier work has discussed this in some detail. Several improvements have been made to this system, allowing for processing of up to 100 g of rock sample at one time, and reduction of the blank. Our measurements from Tabernacle Hill, Utah, an intermediate-altitude basalt with well-constrained conventional 14C ages, yield an estimated cosmogenic 14C production rate of about 50 14C atoms/g/yr. When corrected to sea level we obtain a value of 20 ± 2 14C/g/yr for high-latitude samples.
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U2 - 10.1016/0168-583X(94)96024-0
DO - 10.1016/0168-583X(94)96024-0
M3 - Article
AN - SCOPUS:0001749473
SN - 0168-583X
VL - 92
SP - 308
EP - 310
JO - Nuclear Inst. and Methods in Physics Research, B
JF - Nuclear Inst. and Methods in Physics Research, B
IS - 1-4
ER -