Search results for "nuclide"

Broad beam transmission curves for new radionuclides in brachytherapy

2007

A rotating wheel system for the detection of spontaneously fissioning nuclides from heavy ion reactions

1981

Abstract A rotating wheel system for the detection of spontaneously fissioning reaction products from heavy ion reactions was developed. In this system products recoiling from a rotating target wheel are stopped in a catcher foil stack which can be rotated at various velocities up to 80 rotations per second. All products emitted within a wide emission cone are stopped in the catcher foils and are rotated into shielded positions with stationary fission-track detectors positioned on both sides of each rotating foil. This technique allows a sensitive detection of spontaneously fissioning nuclides over a broad range of half-lives from 1 ms to about 1 d. By post-bombardment exposure of the catch…

68 Ga‐Labelled Tropane Analogues for the Visualization of the Dopaminergic System

2020

Abstract The development of radiometal‐labelled pharmaceuticals for neuroimaging could offer great potential due to easier handling during labelling and availability through radionuclide generator systems. Nonetheless, to date, no such tracers are available for positron emission tomography, primarily owing to the challenge of crossing the blood–brain barrier (BBB) and loss of affinity through chelator attachment. We have prepared a variety of 68Ga‐labelled phenyltropanes showing that, through a simple hydrocarbon‐linker, it is possible to introduce a chelator onto the lead structure while maintaining its high affinity for hDAT (human dopamine transporter) and simultaneously achieving adequa…

Lead isotopic fingerprint in human scalp hair: The case study of Iglesias mining district (Sardinia, Italy)

2017

The Sulcis-Iglesiente district (SW Sardinia, Italy) has been, until recently, one of the most important Italian polymetallic mining areas for the extraction of lead. Epidemiological studies conducted over several decades have indicated this site at high risk of environmental crisis with possible adverse effects on the public health. In the present paper we discuss Pb isotope signatures in human scalp hair and road dust collected from the Sulcis-Iglesiente area in order to trace the exposure of populations to potential Pb sources. A total of 23 determinations (20 on hair samples and 3 on road dust samples) of lead isotope ratios (206Pb/207Pb and 208Pb/206Pb) were carried out. The obtained re…

Submarine groundwater discharge investigations in Sicilian and Brazilian coastal waters using an underwater gamma-ray spectrometer

2006

Abstract Submarine groundwater discharge (SGD) in coastal zones was monitored using in situ underwater gamma-ray spectrometry of radon decay products ( 214 Bi). Several sites were visited during the IAEA'2002 expedition to south-eastern Sicily, where SGD variations were observed in the Donnalucata boat basin. The continuous monitoring carried out for 3 days at the site closest to the coast revealed an anticorrelation dependence of 222 Rn concentration with tide and salinity. The 222 Rn activity concentrations in seawater varied from 2.3 kBq m −3 (during high tides) to 4.8 kBq m −3 (during low tides). In situ gamma-ray spectrometric measurements were also carried out during the IAEA–UNESCO'2…

Fission Product Activity Measurements in Air Particulate Filters Collected after Fukushima Accident at Palermo, Italy

2012

In the framework of routine operation of AGN-201 COSTANZA Nuclear research reactor, measurements of radionuclide air concentration are periodically performed by filtering an high volume of air through paper filters and by using HPGe gamma-ray spectrometry. After Fukushima accident, a series of samplings was carried out with a daily frequency so to detect the possible arrival of air radioactive contamination and to follow its evolution. Particulate collection was performed by suction of atmospheric air through 45cm × 45cm Sofiltra-Poelman HYN-75 (Bleu type) cellulose filter paper using a high-volume air sampler located on the roof of our department 20 m above ground-level. The sampling time …

[Physiopathological significance of renal blood flow reduction in patients with essential arterial hypertension].

1990

a group of 120 patients suffering from E.A.H. divided into three age Plasma renal flow was reduced on average in all three groups. It is t this fact could support the hypothesis that the change in renal per y a pathogenic role in E.A.H. ss F1/hlp F2/que F3/ext F4/can F5/nxt F6/ins F7/up F8/dwn F9/fin

Observation of a $\gamma$-decaying millisecond isomeric state in $^{128}$Cd$_{80}$

2017

A. Jungclaus et al. -- 6 pags., 5 figs., 2 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0

Discovery of the proton emitting nucleus $^{159}$Re

2007

Fund. para Cienc. Tecnol., FCT, Minist. Cienc. Tecnol.;Fundacao Calouste Gulbenkian;Fundacao Luso-Americana

Effect of soil management on its radioisotopic composition

2015

Radioactive isotopes, both natural and artificial, present in the environment may be convenient indicators that can be used to study a number of physical and chemical processes and transport of pollutants in the ecosystem.The main aim of the study was to evaluate the impact of the type of soil use on the radioisotopic composition in its surface layers. The radioisotopic compositions of surface soil samples collected in the area of a cement plant abandoned for over 20 years and in the area of the nearby allotments were examined and compared. Calculations were performed using methods designed to study compositional variables.The results confirmed a significant impact of usage on the radioisot…