THE DISTRIBUTION OF METABOLITES OF [7α-3H]PROGESTERONE IN TISSUES OF MICE

1971 ◽  
Vol 51 (4) ◽  
pp. 727-733 ◽  
Author(s):  
W. TAYLOR ◽  
D. E. WRIGHT
Keyword(s):  
Gastrointestinal Tract ◽  
Liquid Scintillation Counting ◽  
Half Life ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Biliary System ◽  
Appreciable Amount ◽  
Biological Half Life

SUMMARY [7α-3H]Progesterone was administered to two groups of mice. The localization of radioactivity in tissues was examined by autoradiography and by liquid scintillation counting. Particular attention was paid to the distribution of radioactivity in the liver and biliary system. The greatest amount of administered steroid was taken up by the liver, rapidly secreted into the biliary system and excreted into the gastrointestinal tract. Other tissues, including the uterus, did not take up any appreciable amount of radioactivity, and the autoradiographs showed that radioactivity was not associated with any particular region of hepatic and other cells. The biological half-life of radioactivity in the blood was 11 min in animals given labelled progesterone intravenously.

scholarly journals Tartu Radiocarbon Dates XIII

Radiocarbon ◽  
1994 ◽  
Vol 36 (1) ◽  
pp. 153-158
Author(s):  
Arvi Liiva ◽  
Ilze Loze
Keyword(s):  
Standard Deviation ◽  
Oxalic Acid ◽  
Liquid Scintillation Counting ◽  
Half Life ◽  
Liquid Scintillation ◽  
Standard Sample ◽  
Scintillation Counting ◽  
Radiocarbon Dates ◽  
Academy Of Sciences ◽  
Modern Standard

This date list reports dates of archaeological samples of Mesolithic and Neolithic sites of Estonia, Latvia and Lithuania. We use liquid scintillation counting at the Geochemical and Statistical Laboratory of the Institute of Zoology and Botany, Estonian Academy of Sciences. Our modern standard is benzene enriched in 14C and its activity is checked with an NBS oxalic acid standard sample. Dates are given in conventional 14C years, based on the Libby half-life of 5570 ± 30 yr. AD 1950 is the reference year. Errors are based on one standard deviation calculated from count rates.

scholarly journals Tehran University Nuclear Centre Radiocarbon Date List I

Radiocarbon ◽  
1972 ◽  
Vol 14 (2) ◽  
pp. 456-460 ◽  
Author(s):  
Charles Bovington ◽  
Roghiyeh Masoumi
Keyword(s):  
Radioactive Contamination ◽  
Liquid Scintillation Counting ◽  
Half Life ◽  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Chemical Processing ◽  
Cross Contamination ◽  
Light Transfer ◽  
Transfer Properties

The Radiocarbon Dating Laboratory of Tehran University Nuclear Centre began operation in autumn 1970. Benzene synthesis and liquid scintillation counting was chosen as the best method for processing a large number of archaeologic specimens most of whose ages are less than twice the half-life of C14. Advantage of benzene synthesis; ease of chemical processing light transfer properties, lack of isotopie fractionation and radioactive contamination, removal of radon, and improbability of cross-contamination, have been discussed (Noakes et al., 1964; Noakes, Stipp, and Hood, 1964; Kowalski, 1965).

Half-life of rhenium: geologic and cosmologic ages

1984 ◽  
Vol 62 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Stanley N. Naldrett
Keyword(s):  
Organic Compound ◽  
Decay Rate ◽  
Liquid Scintillation Counting ◽  
Half Life ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Beta Emission

The transition by beta emission of 187Re to 187Os would offer an attractive method of determining geologic and cosmologic ages if the decay rate of 187Re was known. An improvement in the determination of the decay rate has been accomplished using an organic compound of rhenium in liquid scintillation counting that is monitored by standards of other pure beta emitting isotopes. The half-life of 187Re is estimated to be (3.5 ± 0.4) × 1010 yr.

scholarly journals Sydney University Natural Radiocarbon Measurements II

Radiocarbon ◽  
1973 ◽  
Vol 15 (3) ◽  
pp. 566-573 ◽  
Author(s):  
R. Gillespie ◽  
R. B. Temple
Keyword(s):  
Oxalic Acid ◽  
Liquid Scintillation Counting ◽  
Half Life ◽  
Liquid Scintillation ◽  
Scintillation Counting

This list describes samples dated in this laboratory from January to November, 1972. Operating principles are as previously reported (Gillespie et al. 1972) using synthesized benzene for liquid scintillation counting. Ages are calculated using 0.95 NBS oxalic acid standard with reference to a.d. 1950 using Libby 5570 year half-life.

scholarly journals Simon Fraser University Radiocarbon Dates II

Radiocarbon ◽  
1983 ◽  
Vol 25 (3) ◽  
pp. 899-907 ◽  
Author(s):  
K A Hobson ◽  
D E Nelson
Keyword(s):  
Data Analysis ◽  
Liquid Scintillation Counting ◽  
Half Life ◽  
Liquid Scintillation ◽  
Isotopic Fractionation ◽  
Scintillation Counting ◽  
Laboratory Procedure ◽  
Radiocarbon Dates ◽  
C Value ◽  
Simon Fraser University

This list reports measurements made on archaeologic samples by our laboratory from September 1980 to May 1982. Results of measurements made during that period which lack review by submitters will be reported in a subsequent date list. Dates were obtained by liquid scintillation counting of benzene using the laboratory procedure outlined previously (R, 1982, v 24, p 344–351). All dates are expressed in 14C years relative to ad 1950 based on the Libby half-life for 14C of 5568 yr. The laboratory standard continues to be ANU sucrose. Data analysis is now performed with the aid of an RT-11 microcomputer interfaced with our Packard model 3255 LS counter. Dates have been corrected for isotopic fractionation only when the δ13C value is given. No corrections have been made for natural 14C variations. The following descriptions of samples are based on information provided by the submitters.

scholarly journals INGEIS Radiocarbon Laboratory Dates II

Radiocarbon ◽  
1985 ◽  
Vol 27 (2B) ◽  
pp. 314-337 ◽  
Author(s):  
Miguel C Albero ◽  
Fernando E Angiolini
Keyword(s):  
Liquid Scintillation Counting ◽  
Half Life ◽  
Liquid Scintillation ◽  
Scintillation Counting

The following list consists of archaeologic and geologic dates from Argentina processed in the 14C laboratory of INGEIS. The ages presented were obtained by liquid scintillation counting of benzene, using the techniques outlined in a previous paper (Albero & Angiolini, 1983). The results are expressed in 14C years relative to 1950, using the Libby half-life of 5570 yr.

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