scholarly journals University of Cambridge Natural Radiocarbon Measurements IX

Radiocarbon ◽  
1970 ◽  
Vol 12 (2) ◽  
pp. 590-598 ◽  
Author(s):  
V. R. Switsur ◽  
M. A. Hall ◽  
R. G. West
Keyword(s):  
Solid State ◽  
High Voltage ◽  
Radiocarbon Dating ◽  
Cosmic Ray ◽  
New Techniques ◽  
Plastic Scintillation ◽  
University Of Cambridge ◽  
Solid State Devices ◽  
Proportional Counters ◽  
The University

The University of Cambridge Radiocarbon Dating Laboratory has been completely rebuilt and modernized, incorporating new techniques developed here for the various stages of measurements. Sample radioactivity is measured in gas proportional counters after conversion to highly purified CO2. Four counters are mounted within a single anticoincidence shield consisting of plastic scintillation material. This is surrounded by a graded cosmic ray shield of low radioactive steel, boron loaded wax, and finally, about 16 tons of ancient low radioactive lead blocks. The electronics are all solid state devices except for the stabilized high voltage supplies.

scholarly journals University of Lund Radiocarbon Dates I

Radiocarbon ◽  
1968 ◽  
Vol 10 (1) ◽  
pp. 36-54 ◽  
Author(s):  
Soren Håkansson
Keyword(s):  
Boric Acid ◽  
Radiocarbon Dating ◽  
Cosmic Ray ◽  
Paraffin Wax ◽  
Radiocarbon Dates ◽  
Proportional Counters ◽  
The University

Plans for a radiocarbon dating laboratory at the University of Lund were initiated by Tage Nilsson and Holger Arbman in 1962. Work was begun in 1964 and at the end of 1965 most of the dating equipment was installed. Dating began in 1966 after careful testing of counting electronics and counters.The dating system has two 1-L copper-walled proportional counters of Östlund-Engstrand construction (for details see Stockholm V. p. 204, Fig. 1) surrounded by 2.5 cm of selected lead, followed by a ring of 23 cosmic-ray Geiger counters (model HZ-100, Zentralwerkstatt Göttingen). On all sides are at least 20 cm of iron. Above and on both long sides of the counters are 10 cm of paraffin wax with about 12% boric acid between the iron layers.

scholarly journals University of Cambridge Natural Radiocarbon Measurements XIV

Radiocarbon ◽  
1975 ◽  
Vol 17 (3) ◽  
pp. 301-312 ◽  
Author(s):  
V R Switsur ◽  
R G West
Keyword(s):  
Research Laboratory ◽  
Radiocarbon Dating ◽  
Plastic Scintillator ◽  
Environmental Radiation ◽  
University Of Cambridge ◽  
Pure Carbon ◽  
Proportional Counters ◽  
Coincidence Mode ◽  
The University ◽  
Pure Carbon Dioxide

The dates presented in this paper comprise results of determinations made at the University Radiocarbon Dating Research Laboratory, mostly during the latter half of 1974. Radioactivity was measured with proportional counters using pure carbon dioxide at 2 atmospheres pressure as filling gas. Effects of cosmic and local environmental radiation on the counters were reduced by surrounding them completely with 1) a plastic scintillator anticoincidence shield, 7.5cm thick, viewed by 2 photomultiplier tubes operating in coincidence mode, the output pulses of which were in anticoincidence with the proportional counters signals, and 2) by a 17.5 ton lead castle.

Radiocarbon Dates and New World Chronology

Antiquity ◽  
1961 ◽  
Vol 35 (140) ◽  
pp. 286-291 ◽  
Author(s):  
Geoffrey Bushnell
Keyword(s):  
Radiocarbon Dating ◽  
New World ◽  
Radiocarbon Dates ◽  
The Past ◽  
University Of Cambridge ◽  
The University ◽  
The Impact

It is a commonplace of current archaeology that the publication of radiocarbon dates is revolutionizing our ideas of the past. Dr G. H. S. Bushnell, Curator of the Museum of Archaeology and Ethnology in the University of Cambridge, England, has already published in ANTIQUITY and elsewhere some of his views on the impact of radiocarbon dating on New World chronology. Here he studies the whole problem in detail. He adopts the useful convention of referring to a date already fully published in the Radiocarbon Supplement to the American Journal of Science simply by its laboratory designation and number {thus K-554 is reading no. 554 of the Copenhagen Laboratory), but in some cases, where the date is not fully published, he gives fuller information.

The Cantabrigian

2021 ◽  
pp. 177-211
Author(s):  
Andrew Zangwill
Keyword(s):  
State Physics ◽  
Solid State ◽  
Graduate Student ◽  
Nobel Prize ◽  
Superfluid Helium ◽  
Half Time ◽  
Solid State Physics ◽  
Mass Generation ◽  
University Of Cambridge ◽  
The University

Anderson spends a sabbatical year at the University of Cambridge. He informs graduate student Brian Josephson about spontaneous symmetry breaking in superconductors and Josephson discovers the effects that bear his name and won him a share of a Nobel Prize. Anderson works in this area and pursues analogies to superfluid helium four. He uses an analogy to his work on superconductivity to suggest a mechanism for mass generation for elementary particles. Peter Higgs generalizes Anderson’s idea and later wins a Nobel Prize for doing so. Anderson spends eight years as a half-time professor at the University of Cambridge. He leads the way to transform solid-state physics into condensed matter physics and does important work on superfluid helium three. He and Joyce buy a vacation home in Port Isaac, Cornwall.

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