Experiences from the production and homogeneity analysis of an AMS 14C sucrose standard for high-activity measurements
(2010) Proceedings of the 20th International Radiocarbon Conference 52(3). p.1351-1357- Abstract
- Accurate accelerator mass spectrometry (AMS) measurements rely on standards with well-known isotopic
ratios. For radiocarbon measurements, a number of standards with different properties are commercially available, of which
the IAEA-C6 sucrose standard with a 14C value of 150.61 pMC is the most active. When analyzing biological samples resulting
from studies using 14C-labeled substances, the activity content can be up to 100 times this value. Thus, there is a need for
a standard material with higher activity content than IAEA-C6 for making accurate AMS measurements on this type of sample.
This paper describes the attempts of producing a standard with an activity content of about 10 times modern... (More) - Accurate accelerator mass spectrometry (AMS) measurements rely on standards with well-known isotopic
ratios. For radiocarbon measurements, a number of standards with different properties are commercially available, of which
the IAEA-C6 sucrose standard with a 14C value of 150.61 pMC is the most active. When analyzing biological samples resulting
from studies using 14C-labeled substances, the activity content can be up to 100 times this value. Thus, there is a need for
a standard material with higher activity content than IAEA-C6 for making accurate AMS measurements on this type of sample.
This paper describes the attempts of producing a standard with an activity content of about 10 times modern carbon. The
material chosen has to be chemically inert, preferably non-toxic, commercially available in 14C-labeled form, and the activity
must be homogeneously distributed within the material. Two different standard materials were considered: urea and sucrose.
Sucrose was chosen for the new standard, since it is non-toxic, inexpensive, and organic and on combustion, forms only carbon
dioxide (CO2) and water (H2O). In this paper, we discuss our experience in the production and homogeneity analysis of
this material, from the crystallization of the sucrose solution to the graphitization of the samples. When using an online combustion
method and a septa-sealed vial reduction method, the AMS measurements indicated that the activity was not homogeneously
distributed throughout the material. Contrary to this, measurements of the sucrose solution prior to recrystallization
indicated that the activity was more homogeneously distributed before than after the recrystallization. In order to determine
whether the inhomogeneity depended on the graphitization method (i.e. the combustion or the reduction method) or on the
material itself, 3 different graphitization methods and 2 different methods of recrystallization were tested. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1671020
- author
- Sydoff, Marie LU and Stenström, Kristina LU
- organization
- publishing date
- 2010
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- Radiocarbon
- volume
- 52
- issue
- 3
- pages
- 1351 - 1357
- publisher
- University of Arizona
- conference name
- Proceedings of the 20th International Radiocarbon Conference
- conference dates
- 2009-05-31 - 2009-06-05
- external identifiers
-
- wos:000285437900051
- ISSN
- 0033-8222
- language
- English
- LU publication?
- yes
- id
- 4a273702-8a8f-4658-8c18-2cec5e1477cb (old id 1671020)
- alternative location
- http://digitalcommons.arizona.edu/restrictedobjectviewer?o=http://radiocarbon.library.arizona.edu/Volume52/Number3/97818f37-d565-4441-9970-e55d5e83d6bf
- date added to LUP
- 2016-04-01 14:34:13
- date last changed
- 2018-11-21 20:27:54
@inproceedings{4a273702-8a8f-4658-8c18-2cec5e1477cb,
abstract = {{Accurate accelerator mass spectrometry (AMS) measurements rely on standards with well-known isotopic<br/><br>
ratios. For radiocarbon measurements, a number of standards with different properties are commercially available, of which<br/><br>
the IAEA-C6 sucrose standard with a 14C value of 150.61 pMC is the most active. When analyzing biological samples resulting<br/><br>
from studies using 14C-labeled substances, the activity content can be up to 100 times this value. Thus, there is a need for<br/><br>
a standard material with higher activity content than IAEA-C6 for making accurate AMS measurements on this type of sample.<br/><br>
This paper describes the attempts of producing a standard with an activity content of about 10 times modern carbon. The<br/><br>
material chosen has to be chemically inert, preferably non-toxic, commercially available in 14C-labeled form, and the activity<br/><br>
must be homogeneously distributed within the material. Two different standard materials were considered: urea and sucrose.<br/><br>
Sucrose was chosen for the new standard, since it is non-toxic, inexpensive, and organic and on combustion, forms only carbon<br/><br>
dioxide (CO2) and water (H2O). In this paper, we discuss our experience in the production and homogeneity analysis of<br/><br>
this material, from the crystallization of the sucrose solution to the graphitization of the samples. When using an online combustion<br/><br>
method and a septa-sealed vial reduction method, the AMS measurements indicated that the activity was not homogeneously<br/><br>
distributed throughout the material. Contrary to this, measurements of the sucrose solution prior to recrystallization<br/><br>
indicated that the activity was more homogeneously distributed before than after the recrystallization. In order to determine<br/><br>
whether the inhomogeneity depended on the graphitization method (i.e. the combustion or the reduction method) or on the<br/><br>
material itself, 3 different graphitization methods and 2 different methods of recrystallization were tested.}},
author = {{Sydoff, Marie and Stenström, Kristina}},
booktitle = {{Radiocarbon}},
issn = {{0033-8222}},
language = {{eng}},
number = {{3}},
pages = {{1351--1357}},
publisher = {{University of Arizona}},
title = {{Experiences from the production and homogeneity analysis of an AMS 14C sucrose standard for high-activity measurements}},
url = {{http://digitalcommons.arizona.edu/restrictedobjectviewer?o=http://radiocarbon.library.arizona.edu/Volume52/Number3/97818f37-d565-4441-9970-e55d5e83d6bf}},
volume = {{52}},
year = {{2010}},
}