Bertahan Dengan Lupus: Gambaran Resiliensi Pada Odapus

In order to deliver reliable results for a multitude of different scenarios, e.g. emergency preparedness, environmental monitoring, nuclear decommissioning and waste management, there is a constant process of method development in the field of radioanalytical chemistry. This work presents the results of a method comparison exercise aimed at quantifying Sr-90 and Pu-239,Pu-240 in environmental soil samples, with the intention of evaluating the performance and applicability of different methods. From the methods examined in this work, recommendations are given in order to find a radioanalytical measurement procedure, for Sr-90 and Pu-239,Pu-240 analysis, which is fit-for-purpose for a particular scenario

NKS ICP User 2017 Seminar Proceedings

The ICP User seminar was held at Risø, Denmark, during 25-27 September 2017. The seminar consisted of 2-day lectures given by six invited professionals and thirteen seminar participants, as well as 1-day lab training by invited expert. The lectures covered different topics including theoretical principles of ICP, methodology development and application of ICP techniques for different isotopes/isotopic ratios, recent development of new ICP technology and its application, etc. The results obtained from the inter-comparison exercise 2016 were presented and discussed. The lab training covered demonstration of the operation of ICP-MS, software and technical instructions. The seminar was attended by 51 individuals from 26 organisations

An inter-comparison exercise on the application of ICP-MS techniques for measurement of long-lived radionuclides

Inductively coupled plasma (ICP) spectrometry techniques are widely used in the fields related to environmental monitoring, nuclear waste disposal and management, radioecology and tracer studies, as well as nuclear forensics and nuclear emergency preparedness. Especially ICP mass spectrometry (ICP-MS) is playing an important role for determination of low-level long-lived radionuclides and their isotopic ratios. ICP optical emission spectrometry (ICP-OES) is commonly used for determining stable elements (Al, Fe, Ca, etc.) and cannot perform isotopic ratio measurement with desirable precision and at low analyte concentrations. Therefore ICP-OES is often used as a supplementary technique to ICP-MS in the analysis, for instance, to screen the matrix composition of a sample, or to determine Sr and Y chemical yield in the Sr-90 analysis, etc. Among the Nordic countries, there are probably less than 20 ICP-MS instruments which are currently applied in the nuclear field for the measurement of radionuclides and their isotopic ratios. Due to different application purposes and technical background of the analysts, each ICP lab has different set-ups and experiences in running these instruments. More efficient application of ICP-MS will be achieved when these experiences are well shared among these labs. Also, for newly established ICP labs or scientists/students in the Nordic countries to quickly build up the competence in operating their instruments in practice, hands-on experience is very valuable. Therefore, within the Nordic-ICP project, an inter-comparison exercise was performed during 2016, which was focused on the measurement of uranium and plutonium isotopes in certified reference material by ICP-MS in combination with radiochemical separation. This report summarizes the results and conclusions obtained base on this inter-comparison exercise

Performance appraisals didactics : Six supervisors describe their view of the aim and structure of performance appraisal

Utifrån att organisationer väljer att använda sig av medarbetarsamtal som ett verktyg med olika syften och metoder var intentionen att synliggöra hur chefer ser på syftet med medarbetarsamtal. Att se hur chefergår tillväga för att implementera sitt eget syfte och mål i samtalet för att det ska nå fram till medarbetaren. Studien bygger på sex intervjuer av mellanchefer på ett statligt företag i södra Sverige. Den empiriska datan har analyserats med utgångspunkt i didaktisk läroteori. Resultatet visar att chefer har makten att styra medarbetarsamtalet i riktning mot sitt eget individuella syfte. Syftet består av två delar: målstyrt fokus och sociala aspekter som fokus. Beroende på chef så förstoras och förminskas de olika delarna utefter vad chefen själv ansåg som viktigt att tala om under samtalet. När syftet är tydligt målstyrt leder det till grundliga förberedelser och mätningar, och när syftet är störst gentemot de sociala aspekterna så leder det till samtal styrda mot hälsa och arbetsmiljö.

Crystal structure of radium sulfate: An X-ray powder diffraction and density functional theory study

Radium-barium sulfate (Ra0.76Ba0.24SO4) powder was examined using X-ray Diffraction (XRD) technique and its crystal structure was optimized using Density Functional Theory (DFT). XRD data show that radium and barium sulfate form a solid solution and that Ra0.76Ba0.24SO4 is orthorhombic and isostructural with pure RaSO4, barite (BaSO4), celestite (SrSO4) and anglesite (PbSO4), crystallizing in the space group Pmna (No. 62). The unit cell parameters of the Ra0.76Ba0.24SO4 crystal have been determined using Rietveld refinement and were extrapolated to unit cell parameters of the pure RaSO4 phase using Vegard's law: a=9.129(8), b=5.538(3), c=7.313(5) Å. DFT geometry optimization was used to derive atomic coordinates and interatomic distances in both Ra0.76Ba0.24SO4 and pure RaSO4. The experimental and DFT geometry optimization results obtained in this work are in good agreement with each other, and furthermore with literature data

Recrystallization of Ra-223 with barium sulfate

In this work, the kinetics of barium sulfate recrystallization has been studied in acidic 0.01 mol dm -3 sodium sulfate solution using Ra-223 and Ba-133 tracers at very low total radium concentration, i. e. less than 10(-13) mol dm(-3). It was found that the system follows the homogeneous recrystallization model and that recrystallization rates, inferred by the decrease of Ra-223 and Ba-133 in the aqueous solution, are fast. Therefore, even at very low concentrations, below the solubility limit, radium will be retained by barium sulfate-a mineral present in the deep underground repository

Recrystallization of Ra-223 with barium sulfate

In this work, the kinetics of barium sulfate recrystallization has been studied in acidic 0.01 mol dm -3 sodium sulfate solution using Ra-223 and Ba-133 tracers at very low total radium concentration, i. e. less than 10(-13) mol dm(-3). It was found that the system follows the homogeneous recrystallization model and that recrystallization rates, inferred by the decrease of Ra-223 and Ba-133 in the aqueous solution, are fast. Therefore, even at very low concentrations, below the solubility limit, radium will be retained by barium sulfate-a mineral present in the deep underground repository

Important parameters for increased productivity in bridge design and production

There is great potential for increased productivity in the production of bridges in terms of optimizing material use, time and cost for design and production. Hence, the environmental impact and cost can be optimized. To find out how standardisation of parts of bridges and which parameters are of most importance for increased productivity in the production of bridges, a quantitate study was performed on the Swedish bridge construction industry. The questionnaire received 151 responses. The results show in which aspects and parameters the industry’s three major actors – engineers, contractors, and clients – see greatest potential in order to increase the productivity. By standardising parts in bridges, there is great potential in making the construction of bridges more productive