scholarly journals Pretoria Radiocarbon Dates I

Radiocarbon ◽  
1971 ◽  
Vol 13 (2) ◽  
pp. 378-394 ◽  
Author(s):  
J. C. Vogel ◽  
M. Marais
Keyword(s):  
Sea Level ◽  
Neutron Monitor ◽  
Cosmic Radiation ◽  
Research Laboratory ◽  
Radiocarbon Dating ◽  
Physical Research Laboratory ◽  
Radiocarbon Dates ◽  
Physical Research ◽  
Nucleonic Component

In 1969 radiocarbon dating facilities were established at the National Physical Research Laboratory of the C.S.I.R. in Pretoria (25° 43′ S Lat, 28° 21′ E Long; alt 1500 m). The counters are situated in an underground room built of selected concrete and covered by ca. 12 m earth. In this room, the nucleonic component of cosmic radiation is practically absent and the meson flux is reduced by a factor of 3.5 as compared to the surface at sea level in Groningen, Netherlands. A neutron monitor which registers 30 cpm on the surface, counts ca. 0.1 cpm in the underground room.

scholarly journals Physical Research Laboratory (Chemistry) Radiocarbon Date List I

Radiocarbon ◽  
1994 ◽  
Vol 36 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Ravi Bhushan ◽  
Supriya Chakraborty ◽  
Seth Krishnaswami
Keyword(s):  
Research Laboratory ◽  
Liquid Scintillation ◽  
Radiocarbon Date ◽  
Physical Research Laboratory ◽  
Radiocarbon Dates ◽  
The Past ◽  
Physical Research

We present here radiocarbon dates obtained using a liquid scintillation system installed at the Physical Research Laboratory (PRL), which has been in operation for the past three years for 14C measurements of oceanographic and geochemical samples from India.

scholarly journals Physical Research Laboratory Radiocarbon Date List II

Radiocarbon ◽  
1977 ◽  
Vol 19 (2) ◽  
pp. 229-236
Author(s):  
D P Agrawal ◽  
R V Krishnamurthy ◽  
Sheela Kusumgar ◽  
R K Pant
Keyword(s):  
Research Laboratory ◽  
San Diego ◽  
Radiocarbon Date ◽  
Indian Coast ◽  
Physical Research Laboratory ◽  
Radiocarbon Dates ◽  
Physical Research ◽  
First Time

Presented below are dates from some important archaeologic and Quaternary sites. For the first time, a large number of dates have been reported here on the eustatic changes on the Eastern Indian coast. All dates are based on τ1/2 — 5568 yr; to convert the radiocarbon dates for archaeological samples into ad/bc scale, 1950 has been used as base year as per resolution passed at the Ninth International Radiocarbon Conference, San Diego, 1976. The dates are not corrected for 13C fractionation.

scholarly journals Physical Research Laboratory Radiocarbon Date List III

Radiocarbon ◽  
1978 ◽  
Vol 20 (2) ◽  
pp. 234-244 ◽  
Author(s):  
D P Agrawal ◽  
R V Krishnamurthy ◽  
Sheela Kusumgar ◽  
R K Pant
Keyword(s):  
Research Laboratory ◽  
San Diego ◽  
Radiocarbon Date ◽  
Physical Research Laboratory ◽  
Radiocarbon Dates ◽  
Physical Research ◽  
Biogenic Carbon

Presented below are dates from some important archaeologic and Quaternary sites. All dates are based on τ ½ = 5568 yr; to convert the radiocarbon dates for archaeologic samples into ad/bc scale, 1950 has been used as base as per the resolution passed at the Ninth International Radiocarbon Conference, San Diego, 1976. The dates are not corrected for 13C fractionation. All the dates older than 10,000 yr have been given with 2σ errors. Due to uncertainty about the contribution of the biogenic carbon in caliche (CaCO3) samples, the dates represent apparent and not true ages.

scholarly journals Study of Polarization in OJ 287

2009 ◽  
Vol 5 (S267) ◽  
pp. 111-111
Author(s):  
U. C. Joshi ◽  
Junhui H. Fan ◽  
Shashikiran Ganesh ◽  
K. S. Baliyan
Keyword(s):  
Research Laboratory ◽  
Physical Research Laboratory ◽  
Physical Research ◽  
Bl Lac

Polarimetry of the BL Lac object OJ 287 has been carried out over the last decade in optical bands with the 1.2-m telescope of Mt. Abu Observatory, operated by Physical Research Laboratory, India. OJ 287 underwent several polarization outbursts during this period.

scholarly journals Further Developments in On-Line Computing and Radiocarbon Dating At the British Museum

Radiocarbon ◽  
1980 ◽  
Vol 22 (2) ◽  
pp. 455-460 ◽  
Author(s):  
A D Hewson ◽  
J A Hall
Keyword(s):  
Research Laboratory ◽  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Full Range ◽  
British Museum ◽  
Scintillation Counting ◽  
Hewlett Packard ◽  
Radiocarbon Dates ◽  
On Line ◽  
Reporting Procedures

In November 1973 the British Museum Research Laboratory acquired a Hewlett Packard 2100A mini-computer for the storage, calculation and retrieval of scientific measurements made on museum objects. A part of the computer's work is the calculation of radiocarbon dates based on the liquid scintillation counting of 14C activities. A system of programs and files has been developed and has been in daily use since August 1974 (Hall and Hewson, 1977).This paper describes changes and improvements to the system to make it more flexible so that it now provides the full range of facilities required by an active 14C laboratory. The reporting procedures in particular have been restructured in the light of experience. The paper will be of interest to all laboratories that have, or hope to have, access to similar mini- or micro-computers.

Sandscaping and C14: the Udal, N. Uist

Antiquity ◽  
1977 ◽  
Vol 51 (202) ◽  
pp. 124-136 ◽  
Author(s):  
Iain Crawford ◽  
Roy Switsur
Keyword(s):  
Eighteenth Century ◽  
Iron Age ◽  
Research Laboratory ◽  
Radiocarbon Dating ◽  
Radiocarbon Dates ◽  
Second Stage ◽  
Research Fellow ◽  
University Of Cambridge ◽  
Queen's University ◽  
European Standards

A research campaign into the scarcely known history and prehistoric origins of Scottish West Highland and Island settlement, has located an area of ‘fossil’ landscape at Coileagan an Udail (the Udal), N. Uist. The completion of a first stage of 14 years excavation (155 weeks) has provided detailed evidence of continuous occupation from the Iron Age to the eighteenth century AD. Sampling has shown positive indications of a similar picture back through much of prehistory at least as far as the Beaker period and is the basis for the proposed second stage of excavations. This remarkably long (by European standards) sequence of deposition has had its coherence confirmed by a first series of radiocarbon dates. The calibration of these dates and their relationship to crucial artifacts is considered. This article is by Iain Crawford, who has just completed two years as Senior Visiting Research Fellow at The Queen's University of Belfast, and Dr Roy Switsur, Head of the Radiocarbon Dating Research Laboratory University of Cambridge.

scholarly journals Physical Research Laboratory, Ahmedabad

Nature ◽  
1954 ◽  
Vol 174 (4441) ◽  
pp. 1078-1080
Author(s):  
K. R. RAMANATHAN
Keyword(s):  
Research Laboratory ◽  
Physical Research Laboratory ◽  
Physical Research

III. Cosmic-ray latitude survey in Western USA and Hawaii in summer, 1966

1969 ◽  
Vol 47 (19) ◽  
pp. 2057-2065 ◽  
Author(s):  
H. Carmichael ◽  
M. A. Shea ◽  
R. W. Peterson
Keyword(s):  
Sea Level ◽  
Neutron Monitor ◽  
Cosmic Radiation ◽  
Measuring Equipment ◽  
Cosmic Ray ◽  
Temperature Structure ◽  
Western Usa ◽  
Secular Variations ◽  
The Usa ◽  
Different Levels

A 3-NM-64 neutron monitor and a 2-MT-64 muon monitor were operated at 29 sites near sea level and on mountains on the western seaboard of the USA and in Hawaii in May, June, and July, 1966, in continuation of the latitude survey begun in 1965 and reported in papers I and II of this set of five papers. The original results and also the corrections for temperature structure of the atmosphere and for secular variations of the cosmic radiation are given in detail. While the overland equipment was at its highest altitude on Mt. Hood (2.4 GV) and on the summits of Mt. Palomar (5.7 GV) and Mt. Haleakela (13.3 GV), an airborne neutron monitor was operated at seven different levels between 3000 m and 12 000 m. The pressure-measuring equipment and also the neutron monitor in the aircraft were calibrated in terms of the overland instruments while the aircraft was at the same altitude as the overland equipment on the summit of Mt. Haleakela.

scholarly journals Tata Institute Radiocarbon Date List XI

Radiocarbon ◽  
1975 ◽  
Vol 17 (2) ◽  
pp. 219-225 ◽  
Author(s):  
D P Agrawal ◽  
Sheela Kusumgar
Keyword(s):  
Research Laboratory ◽  
Radiocarbon Date ◽  
Physical Research Laboratory ◽  
Tata Institute ◽  
Physical Research

This is the last installment of 14C dates done at the Tata Institute; the lab has now shifted to the Physical Research Laboratory, Navarangpura, Ahmedabad-380 009, India.

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