Showing papers in "Applied Radiation and Isotopes in 1999"

TL;DR: An overview of the current techniques for bone mineral density (BMD) measurements is presented and studies of radiation dose to patient from DXA and QCT confirm that patient dose is small and fan beam technology with increased resolution has resulted in increase patient dose radiation dose but this is still relatively small.

TL;DR: This work has shown that the computed tomography dose index can be extended to characterise patient exposure for a complete examination by means of the reference dose quantity dose-length product (DLP).

TL;DR: This contribution presents some preliminary results from an investigation undertaken in a field near Crediton, UK, which successfully demonstrates the potential for using 7Be as a tracer in soil erosion investigations.

TL;DR: Three different samples of Iranian natural zeolites and its sodium exchanged forms have been investigated for uptaking several different cations and Ion-exchange isotherms, have been given and discussed.

TL;DR: The materials examined in this work showed the radioactivity levels below the limit estimated from radium equivalent activity the criterion formula for gamma-activity suggested for acceptable radiation doses attributable to building materials in OECD countries.

TL;DR: Factors such as radiation damage, radioprotection, iodide eluate chemistry, radiolabeling chemistry and radionuclide purity are addressed.

TL;DR: In this paper, the concentrations and distribution of natural and anthropogenic radioactive materials in sediments and soils from around the two major rivers and coastal area of Chittagong, Bangladesh were investigated with an aim of evaluating the environmental radioactivity and radiation hazard.

TL;DR: In this paper, the irradiations were performed on three different cyclotrons with overlapping data points from 6 to 65 MeV, and the optimum energy range for the Mo-100(p,2n)Tc-99m reaction is 22 and 12 MeV with a peak at similar to 17 MeV and maximum cross section of similar to 200 mb.

TL;DR: A fully automated one-pot synthesis of 6-[ 18 F ]fluoro- l -DOPA, an important radiopharmaceutical for studies on the presynaptic dopamine metabolism with positron emission tomography, is described.

TL;DR: If optimal performance is to be achieved, it is necessary to understand how these factors influence image formation and affect radiation dose, and apply methodology for image quality and dose analysis at each stage in the development and use of X-ray equipment.

TL;DR: Current methods for internal dosimetry are reviewed, as they are applied in nuclear medicine, and the Medical Internal Radiation Dose (MIRD) system for Dosimetry is explained and many of its published resources discussed.

TL;DR: Scoring of quality criteria, relating to features observed in a normal clinical radiograph, provides a simple method through which image quality can be assessed in every hospital department.

TL;DR: In this paper, the authors present a review of patient dosimetry measurement methods applied to diagnostic radiology examinations, and their relevance to patient dose surveys are described. But they do not discuss the most applicable dose measurement method for the intended survey.

TL;DR: Practice in diagnostic nuclear medicine is conducted by authorized physicians on the basis of recommended maximum usual activities of radiopharmaceutical for specific procedures, including diagnostic reference levels for some common conventional X-ray examinations.

TL;DR: In this paper, the authors used the Radiotracer technique to assess the toxicity of Hg2+ and Cr3+ on dead biomass Mango (Mangifera indica) and Neem (Azadirachta indica).

TL;DR: In this article, the authors apply the computerized tomography technique to the study of an asphaltic mixture and detect and follow the evolution of a crack, when this mixture was submitted to fatigue tests.

TL;DR: In this article, a study of the radioactive content of a wide selection of commercial bottled mineral waters for human intake was carried out and the results revealed a strong correlation between radioactive content and dry residue, and lead one to conclude that high radioactive content is mainly related to the mineralization in waters of underground origin.

TL;DR: In this paper, the radon concentration and uranium content in soil and rocks were measured in the regions of the Alaknanda and Bhagirathi valleys in the Garhwal Himalaya by using radon emanometry and X-ray fluorescence method, respectively.

TL;DR: In this article, the authors measured cross sections for (n, p) and (n 2n) reactions on palladium isotopes at 13.5-14.7 MeV using the activation technique.

TL;DR: The specific activities in these materials, having a radium equivalent activity of less than 370 Bq kg-1, when evaluated for radiological effects show that all materials meet the external gamma-ray dose limitation of 1.5 mSv y-1.

TL;DR: The uptake of Ba( II) and Sr(II) by hydrous ferric oxide (HFO) was studied as a function of contact time, concentration, temperature and pH of the respective adsorptive solutions employing the 'radiotracer technique'.

TL;DR: A computer-controlled [ 11C]choline synthetic apparatus is constructed which carries out the whole process of synthesis and product purification automatically and the final product is a sterile and pyrogen-free [11C] choline "injection".

TL;DR: Detectors such as ionization chamber, including specialized chambers, and solid detectors, including luminescent detectors, are described, followed by a description of the calibration process.

TL;DR: The Ca/P ratio of the radius was significantly lower in patients with postmenopausal osteoporosis than in premenopausal controls.

TL;DR: Better monitoring of radiation doses, fluoroscopist education, and changes in technology and methods are needed to improve the situation.

TL;DR: 241Pu activity measurements in coniferous forest soil samples from Poland are presented and enhanced levels of 241Pu were observed in all samples from the farthest north-eastern Poland.

TL;DR: In this article, the critical angles of the CR-39 and LR-115 solid state nuclear track detectors (SSNTD) for detecting α-particles emitted by the uranium and thorium series have been evaluated by calculating the corresponding ranges of the emitted αparticles in different material samples and in the SSNTD studied.

TL;DR: The aim of this thesis is to contribute to an extended use of ESR dosimetry in radiation therapy, including development of an alanine-based gel dosimeter and investigation of alternative dosimeter materials.

TL;DR: Results demonstrate that labelling of E. coli with 99mTc does not modify the bacterial viability, and the radiolabelled bacteria may be a good model to study bacterial translocation.

TL;DR: In this article, a stationary monitoring network to observe the sea for radioactive contaminations, using a newly constructed NaI-detector system, is described, and the monitoring efficiency for total γ counting and γ -spectrometry as well as a method suppressing the registration of natural radioactivity are discussed.