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Platzbecker U, Germing U, Götze K, Kiewe P, Wolff T, Mayer K, Chromik J, Radsak M, Wilson D, Zhang X, Laadem A, Sherman M, Attie K, Linde P, Giagounidis A. Luspatercept Response in New Subpopulations of Patients with Lower-Risk Myelodysplastic Syndromes (MDS): Update of the Pace Study. Leuk Res 2017. [DOI: 10.1016/s0145-2126(17)30158-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kumar SR, Pooranagangadevi N, Rajendran M, Mayer K, Flanigan T, Niaura R, Balaguru S, Venkatesan P, Swaminathan S. Physician's advice on quitting smoking in HIV and TB patients in south India: a randomised clinical trial. Public Health Action 2017; 7:39-45. [PMID: 28775942 PMCID: PMC5526492 DOI: 10.5588/pha.16.0045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 11/21/2016] [Indexed: 11/10/2022] Open
Abstract
Setting: National Institute for Research in Tuberculosis, Madurai, India. Objective: To determine the efficacy of physician's advice on quitting smoking compared with standard counselling in patients with tuberculosis (TB) and patients with human immunodeficiency virus (HIV) infection. Design/Methods: This was a clinical trial conducted in Madurai, south India, among 160 male patients (80 with TB and 80 with HIV), randomised and stratified by nicotine dependence (low/high according to the Fagerström scale), who received physician's advice with standard counselling or standard counselling alone for smoking cessation. Abstinence at 1 month was assessed by self-report and carbon monoxide breath analysis. Results: The patients' mean age was 39.4 years (SD 8.5). Overall, 35% of the patients had high nicotine dependence. Most patients (41%) smoked both cigarettes and bidis. In a combined analysis including both the HIV and the TB groups, quit rates were 41% of the 68 patients in the physician group and 35% of the 68 patients in the standard counselling arm. Conclusions: Physician's advice to quit smoking delivered to patients with TB or HIV is feasible and acceptable. Smoking cessation could easily be initiated in TB patients in programme settings. Future studies should assess long-term abstinence rates with a larger sample size to demonstrate the efficacy of physician's advice.
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Yordanova A, Mayer K, Brossart P, Gonzalez-Carmona MA, Strassburg CP, Essler M, Ahmadzadehfar H. Safety of multiple repeated cycles of 177Lu-octreotate in patients with recurrent neuroendocrine tumour. Eur J Nucl Med Mol Imaging 2017; 44:1207-1214. [DOI: 10.1007/s00259-017-3652-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Accepted: 02/08/2017] [Indexed: 12/28/2022]
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Reich B, Mayer K, Scheer I, Tuura R, Beck I, Wetterling K, Hahn A, Latal B, Schranz D, Knirsch W. Influence of Elevated Central Venous Pressure on Brain Development and Neurocognitive Outcome in Children before Fontan Procedure at 2 Years of Age. Thorac Cardiovasc Surg 2017. [DOI: 10.1055/s-0037-1598982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Yordanova A, Ahmadzadehfar H, Gonzalez-Carmona M, Strassburg C, Mayer K, Feldmann G, Schmidt-Wolf I, Lingohr P, Fischer S, Kristiansen G, Essler M. A Step-by-Step Clinical Approach for the Management of Neuroendocrine Tumours. Horm Metab Res 2017; 49:77-85. [PMID: 28099977 DOI: 10.1055/s-0042-121894] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Neuroendocrine tumours (NET) are rare neoplasms, but the incidence is permanently increasing. Most of the NETs are slow proliferating and clinically silent, and for that reason, they are often diagnosed at a stage with advanced disease. The complexity and diversity of the NET-biology require the treatment of patients in specialised centres to guarantee a qualified, multidisciplinary treatment planning. At our institution, we developed an interdisciplinary model for the assessment and treatment of NET. The aim was to adapt the guidelines to the clinical practice, exchange of current knowledge, and a tailored approach to the individual patient. In our team are included medical professionals from pathology, radiology, oncology, gastroenterology, oncological surgery, and nuclear medicine. In this paper, we describe step-by-step a procedural algorithm for the management of patients with neuroendocrine tumours, focusing on midgut-NETs in terms of therapy.
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Mayer K, Schiegerl LJ, Kratky T, Günther S, Fässler TF. Targeted attachment of functional groups at Ge9 clusters via silylation reactions. Chem Commun (Camb) 2017; 53:11798-11801. [DOI: 10.1039/c7cc06622h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A metalloid Ge clusters receives reactive substituents.
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Hermann B, Lehners N, Brodhun M, Boden K, Hochhaus A, Kochanek M, Meckel K, Mayer K, Rachow T, Rieger C, Schalk E, Weber T, Schmeier-Jürchott A, Schlattmann P, Teschner D, von Lilienfeld-Toal M. Influenza virus infections in patients with malignancies -- characteristics and outcome of the season 2014/15. A survey conducted by the Infectious Diseases Working Party (AGIHO) of the German Society of Haematology and Medical Oncology (DGHO). Eur J Clin Microbiol Infect Dis 2016; 36:565-573. [PMID: 27838792 PMCID: PMC5309266 DOI: 10.1007/s10096-016-2833-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 10/26/2016] [Indexed: 12/03/2022]
Abstract
Influenza virus infections (IVI) may pose a vital threat to immunocompromised patients such as those suffering from malignancies, but specific data on epidemiology and outcome in these patients are scarce. In this study, we collected data on patients with active cancer or with a history of cancer, presenting with documented IVI in eight centres in Germany. Two hundred and three patients were identified, suffering from haematological malignancies or solid tumours; 109 (54 %) patients had active malignant disease. Influenza A was detected in 155 (77 %) and Influenza B in 46 (23 %) of patients (genera not determined in two patients). Clinical symptoms were consistent with upper respiratory tract infection in 55/203 (27 %), influenza-like illness in 82/203 (40 %), and pneumonia in 67/203 (33 %). Anti-viral treatment with oseltamivir was received by 116/195 (59 %). Superinfections occurred in 37/203 (18 %), and admission on an intensive care unit was required in 26/203 (13 %). Seventeen patients (9 %) died. Independent risk factors for death were delayed diagnosis of IVI and bacterial or fungal superinfection, but not underlying malignancy or ongoing immunosuppression. In conclusion, patients with IVI show high rates of pneumonia and mortality. Early and rapid diagnosis is essential. The high rate of pneumonia and superinfections should be taken into account when managing IVI in these patients.
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Hoefele J, Mayer K, Marschall C, Alberer M, Klein HG, Kirschstein M. Rare co-occurrence of osteogenesis imperfecta type I and autosomal dominant polycystic kidney disease. World J Pediatr 2016; 12:501-503. [PMID: 27059743 DOI: 10.1007/s12519-016-0014-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Accepted: 12/05/2014] [Indexed: 01/25/2023]
Abstract
BACKGROUND There are several clinical reports about the co-occurrence of autosomal dominant polycystic kidney disease (ADPKD) and connective tissue disorders. A simultaneous occurrence of osteogenesis imperfecta (OI) type I and ADPKD has not been observed so far. METHODS This report presents the first patient with OI type I and ADPKD. RESULTS Mutational analysis of PKD1 and COL1A1 in the index patient revealed a heterozygous mutation in each of the two genes. Mutational analysis of the parents indicated the mother as a carrier of the PKD1 mutation and the father as a carrier of the COL1A1 mutation. The simultaneous occurrence of both disorders has an estimated frequency of 3.5:100 000 000. CONCLUSION In singular cases, ADPKD can occur in combination with other rare disorders, e.g. connective tissue disorders.
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Berens C, Heine A, Müller J, Held SAE, Mayer K, Brossart P, Oldenburg J, Pötzsch B, Wolf D, Rühl H. Variable resistance to freezing and thawing of CD34-positive stem cells and lymphocyte subpopulations in leukapheresis products. Cytotherapy 2016; 18:1325-31. [PMID: 27491794 DOI: 10.1016/j.jcyt.2016.06.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 05/20/2016] [Accepted: 06/23/2016] [Indexed: 11/28/2022]
Abstract
BACKGROUND AIMS Leukapheresis products for hematopoietic stem cell transplantation can be cryopreserved for various indications. Although it is known that CD34(+) cells tolerate cryopreservation well, a significant loss of CD3(+) cells has been observed, which has been ascribed to several factors, including transport, storage conditions and granulocyte-colony stimulating factor (G-CSF) administration. METHODS To assess the tolerance of CD34(+) cells and lymphocyte subpopulations for cryopreservation and thawing, the post-thaw recoveries of CD34(+) cells, CD3(+)CD4(+) cells, CD3(+)CD8(+) cells, CD19(+) cells and CD16(+)CD56(+) cells were determined in 90 cryopreserved apheresis products, among which 65 were from G-CSF-mobilized donors, and 34 from unrelated donors that underwent transport before cryopreservation at our center. A controlled rate freezer and 5% dimethyl sulfoxide were used for cryopreservation. RESULTS We could detect statistically significant differences for CD34(+) cell recovery (93.0 ± 20.7%) when compared to CD3(+)CD4(+) cell (83.1 ± 15.4%, P = 0.014), and CD3(+)CD8(+) cell recovery (83.3 ± 13.9%, P = 0.001). Similarly, CD19(+) cell recovery (98.6 ± 15.1%) was higher than CD3(+)CD4(+) cell (P = 2.5 × 10(-7)) and CD3(+)CD8(+) cell recovery (P = 1.2 × 10(-8)). Post-thaw recovery rates of all cell populations were not impaired in G-CSF-mobilized products compared with non-mobilized products nor in unrelated compared with related donor products. DISCUSSION Our data suggest a lower tolerance of CD3(+) cells for cryopreservation and demonstrate that freezing-thawing resistance thawing is cell-specific and independent from other factors that affect post-thaw recovery of cryopreserved cells. Thus, a clinical consequence may be the monitoring of post-thaw CD3(+) cell doses of cryopreserved products, such as donor lymphocyte infusions.
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Siegler BH, Bernhard M, Brenner T, Gerlach H, Henrich M, Hofer S, Kilger E, Krüger WA, Lichtenstern C, Mayer K, Müller M, Niemann B, Oppert M, Rex S, Rossaint R, Weiterer S, Weigand MA. [CVP - farewell? Please don't! : Comments on the S3 guidelines on "intravascular volume therapy in adults"]. Anaesthesist 2016; 64:489-93. [PMID: 26159667 DOI: 10.1007/s00101-015-0050-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Schlaweck S, Brägelmann J, Brossart P, Mayer K. Exanthem subitum (human herpesvirus-6 reactivation) after autologous stem cell transplantation. Transpl Infect Dis 2016; 18:255-6. [DOI: 10.1111/tid.12514] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Revised: 12/06/2015] [Accepted: 12/11/2015] [Indexed: 11/27/2022]
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Mayer K. Update on HIV Prevention. Int J Infect Dis 2016. [DOI: 10.1016/j.ijid.2016.02.159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Satyanarayana S, Subbaraman R, Shete P, Gore G, Das J, Cattamanchi A, Mayer K, Menzies D, Harries AD, Hopewell P, Pai M. Quality of tuberculosis care in India: a systematic review. Int J Tuberc Lung Dis 2016; 19:751-63. [PMID: 26056098 DOI: 10.5588/ijtld.15.0186] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND While Indian studies have assessed care providers' knowledge and practices, there is no systematic review on the quality of tuberculosis (TB) care. METHODS We searched multiple sources to identify studies (2000-2014) on providers' knowledge and practices. We used the International Standards for TB Care to benchmark quality of care. RESULTS Of the 47 studies included, 35 were questionnaire surveys and 12 used chart abstraction. None assessed actual practice using standardised patients. Heterogeneity in the findings precluded meta-analysis. Of 22 studies evaluating provider knowledge about using sputum smears for diagnosis, 10 found that less than half of providers had correct knowledge; 3 of 4 studies assessing self-reported practices by providers found that less than a quarter reported ordering smears for patients with chest symptoms. In 11 of 14 studies that assessed treatment, less than one third of providers knew the standard regimen for drug-susceptible TB. Adherence to standards in practice was generally lower than correct knowledge of those standards. Eleven studies with both public and private providers found higher levels of appropriate knowledge/practice in the public sector. CONCLUSIONS Available evidence suggests suboptimal quality of TB care, particularly in the private sector. Improvement of quality of care should be a priority for India.
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Mayer K, Nellessen C, Hahn-Ast C, Schumacher M, Pietzonka S, Eis-Hübinger AM, Drosten C, Brossart P, Wolf D. Fatal outcome of human coronavirus NL63 infection despite successful viral elimination by IFN-alpha in a patient with newly diagnosed ALL. Eur J Haematol 2016; 97:208-210. [PMID: 26854965 PMCID: PMC7163643 DOI: 10.1111/ejh.12744] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/03/2016] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Human coronavirus NL63 (HCoV-NL63) is one of four common human respiratory coronaviruses. Despite high incidence, HCoV infections are grossly understudied. We here report a case of HCoV infection in a leukemia patient with fatal ARDS despite successful virus elimination by pegylated interferon-alpha (PEG-IFN-α). CASE The 27-year-old female pre-T-ALL patient was treated according to the German-Multicenter Trial for Adult ALL protocol. No relevant infectious complications were seen until day 35 when the neutropenic patient developed fever without any clinical focus. Antibiotic prophylaxis was switched to meropenem. The patient deteriorated rapidly with respiratory failure due to ARDS. Anti-infectious therapy was escalated to additional linezolid and liposomal amphotericine-B. BAL revealed a significant viral load of HCoV-NL63. Based on successful application of PEG-IFN against the related SARS coronavirus in animal experiments, a single injection of 180 μg PEG-IFN-α2b was applied. Despite immediate initiation of treatment and elimination of virus in subsequent tests, the progressive lung failure led to death 7 d after onset of fever with massive lung bleeding as a consequence of diffuse alveolar hemorrhage. CONCLUSION This report emphasizes the fatal consequences of common respiratory virus infections in immunocompromised patients. HCoV-NL63 replication can be reduced by treatment with peg-IFN if diagnosed early.
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Reich B, Knirsch W, Mayer K, Tuura R, Scheer I, Beck I, Bauer J, Wetterling K, Hahn A, Hofmann K, Latal B. Cerebral MR Morphometry and Neurodevelopmental Outcome in Children before Fontan Procedure at 2 Years of Age: White Matter Volume Is Smaller after Norwood Procedure. Thorac Cardiovasc Surg 2016. [DOI: 10.1055/s-0036-1571859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bauermeister J, Giguere R, Dolezal C, Leu CS, Febo I, Cranston RD, Mayer K, McGowan I, Carballo-Diéguez A. To Use a Rectal Microbicide, First Insert the Applicator: Gel and Applicator Satisfaction Among Young Men Who Have Sex With Men. AIDS EDUCATION AND PREVENTION : OFFICIAL PUBLICATION OF THE INTERNATIONAL SOCIETY FOR AIDS EDUCATION 2016; 28:1-10. [PMID: 26829253 PMCID: PMC4942182 DOI: 10.1521/aeap.2016.28.1.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We examined how experiences with a rectal placebo gel and applicator used with receptive anal intercourse (RAI) related to young men who have sex with men's (YMSM) likelihood of using a rectal microbicide gel and applicator in the future. An ethnically diverse sample of 95 YMSM (aged 18 to 30 years) were asked to insert hydroxyethylcellulose (HEC) placebo gel rectally before RAI during 12 weeks and report the product's acceptability (i.e., satisfaction with applicator and gel, respectively; perceived gel side effects; and sexual satisfaction when gel was used) and likelihood of future microbicide use. Main and interaction effects predicting future use intentions were tested using linear regression. We found a positive association between future use intentions and applicator satisfaction (b = .33, p < .001). In a subsequent interaction effects model, we found that greater gel satisfaction was associated with increased future use intentions; however, the strength of this relationship was magnified when YMSM reported greatest satisfaction with the rectal applicator. Applicator satisfaction may be a salient factor in YMSM's decision-making to use a rectal microbicide in the future. Although the importance of developing a satisfactory rectal microbicide gel for YMSM is undeniable for its future use, our results also emphasize the importance of developing strategies that increase YMSM's comfort and skill when using a rectal applicator. Future research examining how to optimize the design, properties, and characteristics of a rectal applicator as a strategy to promote greater satisfaction and use among YMSM is merited.
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Giovannini G, Flöck A, Nellessen C, Mayer K, Gembruch U, Merz W. Akute Promyelozytenleukämie in der Schwangerschaft: erfolgreiche Behandlung mit ATRA Monotherapie. Z Geburtshilfe Neonatol 2015. [DOI: 10.1055/s-0035-1566617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Arslan-Kirchner M, Arbustini E, Boileau C, Charron P, Child AH, Collod-Beroud G, De Backer J, De Paepe A, Dierking A, Faivre L, Hoffjan S, Jondeau G, Keyser B, Loeys B, Mayer K, Robinson PN, Schmidtke J. Clinical utility gene card for: Hereditary thoracic aortic aneurysm and dissection including next-generation sequencing-based approaches. Eur J Hum Genet 2015; 24:e1-5. [PMID: 26508578 DOI: 10.1038/ejhg.2015.225] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 07/28/2015] [Accepted: 07/30/2015] [Indexed: 01/10/2023] Open
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Siegler B, Bernhard M, Brenner T, Gerlach H, Henrich M, Hofer S, John S, Kilger E, Krüger W, Lichtenstern C, Mayer K, Müller M, Niemann B, Oppert M, Rex S, Rossaint R, Weiterer S, Weigand M. ZVD – ein Sicherheitsparameter. Anaesthesist 2015; 64:977-980. [DOI: 10.1007/s00101-015-0106-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kiss-Tóth E, Orosz A, Mayer K, Lukács A. Benefits of regular exercise on quality of life and coping skills in adolescents. Eur J Public Health 2015. [DOI: 10.1093/eurpub/ckv176.291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Venchiarutti C, Varga Z, Richter S, Nicholl A, Krajko J, Jakopič R, Mayer K, Aregbe Y. IRMM-1000a and IRMM-1000b: uranium reference materials certified for the production date based on the 230Th/ 234U radiochronometer. Part II: certification. J Radioanal Nucl Chem 2015; 308:105-111. [PMID: 27069295 PMCID: PMC4788687 DOI: 10.1007/s10967-015-4368-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2015] [Indexed: 11/15/2022]
Abstract
The IRMM-1000a and IRMM-1000b uranium reference materials, of 20 and 50 mg uranium, respectively, were produced by the European Commission Joint Research Centre's Institute for Reference Materials and Measurements (EC-JRC-IRMM) in collaboration with the Institute for Transuranium Elements (EC-JRC-ITU). They are novel uranium reference materials certified for the production date based on the 230Th/234U radiochronometer, i.e. the date of the last chemical separation of these two radionuclides. The certified reference value and its uncertainty, homogeneity and stability of the material were established in accordance with the ISO Guide 34:2009 and the 'Guide to the Expression of Uncertainty in Measurement'.
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Wolf D, Mayer K. When and how to 'FLAMSA-RIC' in acute myeloid leukemia? Eur J Haematol 2015; 96:445-6. [PMID: 26301717 DOI: 10.1111/ejh.12676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Krajko J, Varga Z, Wallenius M, Mayer K. Development of a versatile sample preparation method and its application for rare-earth pattern and Nd isotope ratio analysis in nuclear forensics. J Radioanal Nucl Chem 2015. [PMID: 26224986 PMCID: PMC4514581 DOI: 10.1007/s10967-014-3505-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
An improved sample preparation procedure for trace-levels of lanthanides in uranium-bearing samples was developed. The method involves a simple co-precipitation using Fe(III) carrier in ammonium carbonate medium to remove the uranium matrix. The procedure is an effective initial pre-concentration step for the subsequent extraction chromatographic separations. The applicability of the method was demonstrated by the measurement of REE pattern and 143Nd/144Nd isotope ratio in uranium ore concentrate samples.
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Varga Z, Mayer K, Bonamici CE, Hubert A, Hutcheon I, Kinman W, Kristo M, Pointurier F, Spencer K, Stanley F, Steiner R, Tandon L, Williams R. Validation of reference materials for uranium radiochronometry in the frame of nuclear forensic investigations. Appl Radiat Isot 2015; 102:81-86. [PMID: 26043276 DOI: 10.1016/j.apradiso.2015.05.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 05/08/2015] [Accepted: 05/11/2015] [Indexed: 10/23/2022]
Abstract
The results of a joint effort by expert nuclear forensic laboratories in the area of age dating of uranium, i.e. the elapsed time since the last chemical purification of the material are presented and discussed. Completely separated uranium materials of known production date were distributed among the laboratories, and the samples were dated according to routine laboratory procedures by the measurement of the (230)Th/(234)U ratio. The measurement results were in good agreement with the known production date showing that the concept for preparing uranium age dating reference material based on complete separation is valid. Detailed knowledge of the laboratory procedures used for uranium age dating allows the identification of possible improvements in the current protocols and the development of improved practice in the future. The availability of age dating reference materials as well as the evolvement of the age dating best-practice protocol will increase the relevance and applicability of age dating as part of the tool-kit available for nuclear forensic investigations.
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