1
|
Blain E, Nishikawa K, Faye SA, Roselan A, Burn AG, Torres MA, Semkow TM. Detection Capability of 89Sr and 90Sr Using Liquid Scintillation Counting. HEALTH PHYSICS 2023; 125:123-136. [PMID: 37384913 PMCID: PMC10361665 DOI: 10.1097/hp.0000000000001698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/01/2023]
Abstract
ABSTRACT We developed a new method for simultaneous determination of 89Sr and 90Sr with an emphasis on detectability. The samples were digested, and Sr was chemically purified followed by a single count on a liquid scintillation counter in three windows overlapping the 90Sr, 89Sr, and 90Y peaks. Gamma spectrometry was used to measure 85Sr, added for chemical recovery. The method was tested on 18 water samples spiked at levels from 9 to 242 Bq of 89Sr and 90Sr, with either single radionuclides or their mixtures. In addition, eight method blanks were measured. The data were analyzed numerically by solving a system of linear equations for 89Sr and 90Sr activities as analytes and 90Y activity as a participating component. The total uncertainties of the results were calculated numerically using variances and covariances. The average bias from the known activities was -0.3% (range from -3.6 to 3.1%) for 90Sr and - 1.5% (range from -10.1 to 5.1%) for 89Sr. The En-scores were within -1.0 and 1.0 at 95% confidence level. The detection capabilities of this method were determined by means of the decision threshold LC and the limit of detection referred to as the minimum detectable activity. All relevant uncertainties were propagated into the LC and minimum detectable activity. In addition, detection limits were calculated for the purpose of Safe Drinking Water Act monitoring. The detection capabilities were compared with the regulatory requirements in the US and EU for food and water. For samples spiked with either pure 89Sr or 90Sr, false positives were observed for the opposite radionuclide exceeding the above LC values. This was attributed to interference by the spiked activity. A new method was developed to calculate decision and detectability curves in the presence of interference.
Collapse
Affiliation(s)
- Ezekiel Blain
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, USA
| | - Kimi Nishikawa
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, USA
| | - Sherry A. Faye
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, USA
- Department of Environmental Health Sciences, School of Public Health, University at Albany (SUNY), Rensselaer, NY 12144, USA
| | - Amy Roselan
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, USA
| | - Adam G. Burn
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, USA
- Department of Environmental Health Sciences, School of Public Health, University at Albany (SUNY), Rensselaer, NY 12144, USA
| | - Miguel A. Torres
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, USA
| | - Thomas M. Semkow
- Wadsworth Center, New York State Department of Health, Albany, NY 12201, USA
- Department of Environmental Health Sciences, School of Public Health, University at Albany (SUNY), Rensselaer, NY 12144, USA
| |
Collapse
|
2
|
Jakab D, Pázmándi T, Zagyvai P. Effects of the uncertainty contributions on the methods used for measurement uncertainty evaluation. Appl Radiat Isot 2021; 173:109704. [PMID: 33819730 DOI: 10.1016/j.apradiso.2021.109704] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 03/20/2021] [Accepted: 03/22/2021] [Indexed: 11/17/2022]
Abstract
Adequate measurement uncertainty evaluation is crucial for supporting basic measurement purposes. However, the most prevalent approach, the uncertainty propagation, may not be validly applicable under certain conditions which require the use of less restricted alternative method (MCM-based propagation of distributions). We demonstrate the effects of major conditions, e.g. non-linear measurement model, non-Gaussian input quantities, on the reliability of uncertainty evaluation methods, highlighting the importance of the less frequently examined impact of uncertainty component contributions to the standard uncertainty of measurand.
Collapse
Affiliation(s)
- Dorottya Jakab
- Centre for Energy Research, 29-33 Konkoly-Thege Miklós Street, H-1121, Budapest, Hungary.
| | - Tamás Pázmándi
- Centre for Energy Research, 29-33 Konkoly-Thege Miklós Street, H-1121, Budapest, Hungary
| | - Péter Zagyvai
- Centre for Energy Research, 29-33 Konkoly-Thege Miklós Street, H-1121, Budapest, Hungary
| |
Collapse
|
3
|
Dolique I, Kabai E, Schuster M. Fast method for the determination of radiostrontium and plutonium isotopes in food samples. J Radioanal Nucl Chem 2019. [DOI: 10.1007/s10967-019-06850-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
4
|
Shirono K, Unno Y, Furukawa R, Yonezawa C. A practical evaluation of measurement uncertainty in gamma-ray efficiency curve determination through an analytical approach. Appl Radiat Isot 2017; 121:131-141. [PMID: 28092868 DOI: 10.1016/j.apradiso.2016.12.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 10/21/2016] [Accepted: 12/05/2016] [Indexed: 10/20/2022]
Abstract
An example of uncertainty evaluation of an efficiency curve is reported. In the applied method, the efficiency curve is determined through the weighted least square method based on measured efficiencies employing a mixed-radionuclide standard source. The variance-covariance matrix of the efficiencies is determined by evaluating the uncertainties of the counting, the calibrated radioactivities, the correction factors for true coincidence summing, and the inadequacy of the fitting function. The proposed method can be a basis to develop a more general procedure.
Collapse
Affiliation(s)
- Katsuhiro Shirono
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan.
| | - Yasuhiro Unno
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan.
| | - Rio Furukawa
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan.
| | - Chushiro Yonezawa
- Japan Institute of International Affairs (JIIA), Toranomon Mitsui Bldg., 3-8-1 Kasumigaseki, Chiyoda-ku, Tokyo 100-0013, Japan.
| |
Collapse
|
5
|
Combined method for the fast determination of pure beta emitting radioisotopes in food samples. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-4960-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
6
|
Kanisch G. Generalized evaluation of environmental radioactivity measurements with UncertRadio Part II: Methods with linear unfolding. Appl Radiat Isot 2016; 110:74-86. [DOI: 10.1016/j.apradiso.2015.12.046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 12/07/2015] [Accepted: 12/16/2015] [Indexed: 10/22/2022]
|