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Introduction

Our facility is based on ultra-low-level liquid scintillation counting of radiocarbon activity following conversion of sample carbon to benzene. The laboratory operates two liquid scintillation detection systems for measuring radiocarbon; a Quantulus system and a Packard TriCarb 2770 system.

Radiocarbon benzene synthesis system


Intercalibration

The UCD laboratory has achieved international recognition through performance in intercalibration studies (Table 1). Results demonstrate the accuracy of the system, and illustrate our ability to successfully handle all types of sample (the intercomparison exercises included wood, peat, turbidite and travertine). The span of dates of the intercomparison samples shows that accuracy is maintained irrespective of sample age.


Sample

Consensus Age

UCD Age

TIRI-I

11,060 ± 17

11,107 ± 145

TIRI-J

1,605 ± 8

1,675 ± 25

TIRI-K

18,155 ± 34

18,127 ± 260

TIRI-H

11,152 ± 23

10,860 ± 150

TIRI-M

1,682 ± 15

1,646 ± 25

IAEA-C2

7,163 ± 12

7,240 ± 90

IAEA-C4

43,550 to 49,970

43,430 ± 1,090

IAEA-C5

11,835 ± 32

11,745 ± 180

Table 1. Consensus and UCD radiocarbon ages determined through blind analysis of intercomparison materials. TIRI is the Third International Radiocarbon Intercomparison, IAEA is the International Atomic Energy Agency. The standard deviation associated with the consensus age is derived from the calculation of a global mean and does not represent the typical error associated with an age estimation.


Our Work

Prior to benzene synthesis, all samples are pre-treated to ensure removal of any carbon that might not have been indigenous to the sample at its time of formation. Pre-treatment is assessed based on our knowledge of sample provenance, and we therefore require a detailed sample submission form for all samples we analyse.

We are primarily a research laboratory but we also carry out analysis on a commercial basis at competitive rates. Detail of the systemDetails of our prices and sample requirements are linked to this page. Some of our research interests include the formation and history of Irish Peatlands, and the dating of pine expansion phases recorded as sub-fossil wood preserved in the peat.

We are also involved in modelling exchange processes in order to determine residence times of groundwaters in Irish aquifers. This work includes radiocarbon analysis of carbonates precipitated from water taken from wells and boreholes. The radiocarbon data are then used in conjunction with chemical (including stable isotope) analysis of groundwater and bedrock to model catchment processes and estimate the age of the waters.

We have an ongoing project in which we are dating materials recovered from 'drowned bogs'. Ireland is endowed with some unusual sites where peat of terrestrial origin are now below sea level. These sites provide an excellent opportunity for the study of rates of change in relative sea level through time.

We are involved in numerous projects in which we are dating lake core sediments combining C-14, Pb-210, Cs-137 and Am-241 analyses and we have excellent facilities for analysis of all of these isotopes in our laboratory.

 

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Phone: +353 1 7162223