Carl-Erik Magnusson

The Spectrum and Term System of SV

The spectrum of S V has been studied in the region 130-7800 A by means of a sliding vacuum spark. About 385 lines have been identified, 330 of which are new, and many new terms have been established. Some 30 intersystem lines have been found, fixing the triplet system relative to the singlet system. By means of a polarization formula applied to the 3snh and 3sni series the ionization limit is derived to be 585 514.1 ± 1.0 cm-1.

Biokinetics and radiation dosimetry for patients undergoing a glycerol tri[1-14C]oleate fat malabsorption breath test.

The glycerol tri[1-14C]olein test for fat malabsorption was carried out in two male volunteers and measurements of the loss of 14C in expired air, urine and faeces and the retention of 14C in biopsy samples of abdominal fat were made using accelerator mass spectrometry. Exhalation accounted for 73% and 55% of the administered activity and could be described by three-component exponential functions with halftimes of about 1h, 2 days and 150 days, respectively. Urinary excretion accounted for 24% of the administered activity, almost all during the first 24h after administration; about 2% was excreted in the faeces in 48h. The halftime of retention of 14C in fat ranged from 137 to 620 days. Absorbed dose calculations indicate that for a normal adult the largest dose, 1.5-7.0mGy/MBq is received by the adipose tissue, and that the effective dose is 0.3-0.5mSv/MBq. It is concluded that no restrictions need to be placed on radiation safety grounds on the administration of 0.05-0.1MBq 14C-triolein for the triolein breath test.

Forbidden Transitions in Na- and Mg-like Spectra

Quantitative comparisons between observed and theoretical wavelengths and intensity ratios are made to confirm the identification of some emission lines observed in the spectra of Na- and Mg-like ions as electric quadrupole (E2) transitions. The transition rates of these lines connecting D symmetry levels and the ground level are calculated using the multi-configuration Hartree-Fock (MCHF) wavefunctions.

The Spectrum of Singly Ionized Phosphorus, P II

New observations in the P II spectrum have been made in the wavelength region 500-12 000 A. The spectrum was excited in two different ways, using a high-frequency lamp and a sliding spark in vacuum. The term system now includes 159 levels and about 900 identified lines, which means a doubling of the number of levels and identified transitions. The energy of the lowest limit, 3s2 3p 2P, is derived from ng-series, which are all new. A linear Ritz formula gives the value 160 010.6 cm-1 for the 2P3/2 component of the limit, and the ground term splitting 559.14 cm-1 in P III then gives 159 451.5 cm-1 for the 2P1/2 limit level.

The Spectrum of Doubly Ionized Phosphorus, P III

New observations in the spectrum of P III have been made in the wave-length region 200-9 800 A by using a sliding spark in vacuum. The term system now includes 58 complete terms, 36 of which are new and some more completed or resolved. It is based on about 640 spectrum lines, some 530 of which are newly classified. About 10% of the lines are intercombinations fixing the quartet and doublet systems relative to each other. The whole system has been recalculated on the basis of the new measurements. The energy of the lowest ionization limit has been deduced from a polarization formula applied to the nh 2H series, giving the value 243 600.7±0.7 cm-1.

A spectroscopic study of S III

This paper a presents a list of some 240 lines from laboratory data identified as S III transitions, 12% of which are intercombination lines. About 60 lines were not observed earlier, whereas the accuracy of the others is imporved. Ten new singlet terms and two triplet terms are derived. The report is based on experimental data recorded at Lund and is part of a comprehensive work on the S III spectrum.

The Spectrum and Term System of S VI

The spectrum of five times ionized sulphur has been studied in the wavelength region 100-8000 A by means of a sliding spark in vacuum. About 90 lines are now attributed to the system, some 70% of which are classified for the first time. The ionization energy, 710 194.7 cm-1, derived from a polarization formula based on f, g and h terms is in accordance with Ritz formulae applied to the ns, np and nd series.

26Al investigations at the AMS-laboratory in Lund

At the accelerator mass spectrometry (AMS) laboratory in Lund, a facility for (26)Al analysis is under development. The sensitivity is expected to be several orders of magnitude higher than with standard mass spectrometry. The planned biomedical program includes studies of aluminium uptake, distribution and retention in man. The initial work has been concentrated on the construction and testing of a new dedicated injector for the accelerator and on the preparation of biological samples for aluminium analysis. The current quality of the facility is presented and the first experimental results reported.

Some examples of the application of an analitical technique to ion-optical calculations for a new injector of the Lund Pelletron accelerator

Abstract The 3UDH Pelletron tandem accelerator in Lund is being developed to be more suitable for accelerator mass spectrometry of heavy ions. This development includes the installation of an electrostatic and a magnetic analyzer in a new injector aimed to obtain better mass and energy separation. In the present paper some applications of the first-order analytical calculation technique, used at the design stage of the new injector, are discussed. The estimation of the maximum possible opening of the analyzer slits was carried out, followed by the calculation of the analyzer acceptances. The values of the acceptances for the two transversal planes, as well as their contours are given. Some results of more detailed numerical calculation of the ion beam transport through the analyzers are reported.

Biokinetic and dosimetric investigations of 14C-labeled substances in man using AMS

Up to now, radiation dose estimates from radiopharmaceuticals, labeled with pure β-emitting radionuclides, e.g., 14C or 3H have been very uncertain. Using accelerator mass spectrometry (AMS) we have derived new and improved data for 14C-triolein and 14C-urea and are currently running a program related to the biokinetics and dosimetry of 14C-glycocholic acid and 14C-xylose. The results of our investigations have made it possible to widen the indications for the clinical use of the 14C-urea test for Helicobacter pylori infection in children. The use of ultra-low activities, which is possible with AMS (down to 1/1000 of that used for liquid scintillation counting), has opened the possibility for metabolic investigations on children as well as on other sensitive patient groups like new-borns, and pregnant or breast-feeding women. Using the full potential of AMS, new 14C-labeled drugs could be tested on humans at a much earlier stage than today, avoiding uncertain extrapolations from animal models.