Search results for " technetium"

Chemists and Physicists searching for element 43

2005

From Masurium to Trinacrium: The Troubled Story of Element 43

2005

The first man-made chemical element was that with atomic number 43. It was produced at the University of Californiaâ€sA„A¬Berkeley (by neutron bombardment of a molybdenum plate and was chemically identified at the University of Palermo (Italy) in 1937 by Segre and Perrier. Previous attempts to identify it in natural ore had been unsuccessful, owing to the short life of its isotopes. Notwithstanding, several claims of its discovery had appeared in the chemical literature. The history of this discovery clearly shows the dramatic improvements of chemical analytical techniques and criteria in the first half of 20th century. In 1949 its discoverers proposed to call it technetium, which means pro…

Erythroderma related to the administration of 99mTc-sestamibi: The first report

2009

Szintigraphie adrenerger Tumoren mit 131J-meta-Benzylguanidin

2008

Pheochromocytoma scanning using 131J-meta-benzylguanidine was done in one patient with metastasizing paraganglioma, one patient with multiple endocrine neoplasia type IIb. No activity of tumour tissue could be demonstrated in the patient with metastasizing paraganglioma, whereas the pheochromocytoma could be clearly defined in the patient with multiple endocrine neoplasia type IIa. The female with multiple endocrine neoplasia type IIb showed a suspect space-occupying lesion of the left adrenal using computed tomography. Pheochromocytoma could be excluded by 131J-benzylguanidine scanning, selective estimation of catecholamines in adrenal venous blood as well as the glucagon stimulation and c…

Level lifetimes in neutron-rich Ru isotopes

1995

The neutron-rich Ru isotopes are situated between the strongly deformed Sr-Zr region with axial deformation of f l _ 0.40 [1] and the spherical Cd-Sn region. Evidence for triaxiality of even-even Ru isotopes has been presented in [2-5], and lifetimes of some of their 2 + states have been measured in fission studies [6-9]. It seems, however, that in these experiments the nearly identical energies of the 2 + ---* 0 + transitions in l~ and 11~ could not be separated. Therefore, high-resolution measurements are required in order to perceive the evolution of deformation with increasing neutron number. So far only few measurements by the delayed-coincidence method [10] have been performed on chem…

The decay of105Tc to levels in105Ru

1975

Theβ−-decay of 7.6-min105Tc has been investigated byβ- andγ-ray singles and coincidence measurements. The activities have been produced by thermal-neutron-induced fission of235U or239Pu and subsequent chemical separation of the technetium fraction from the fission product mixture. AQβ-value of 3.2±0.2 MeV has been determined. In a delayed coincidence experiment the lifetime of the first excited state in105Ru at 20.55 keV has been measured to be 340±15 nsec. A level scheme of105Ru is proposed and compared with the results of recent nuclear reaction studies like104Ru(d, p) and104Ru(n, γ). From beta branching ratios to levels in105Ru, ground state spin and parity of 5/2+ can be suggested for10…

G.F.R. measuring with 99mTc-DTPA: limits in obstructive acute renal failure.

1991

After a short introduction on the advantages and limits of G.F.R. determination with Ccr, the radioisotopic methods proposed by Schlegel and Gates for this parameter are described, and as well as ERPF and FF, without blood serial samples being necessary. In a severe renal failure case due to obstruction, the Authors have found a great mismatch in the results between the traditional methods and the radioisotopic ones. After the clinical case description, a possible explanation of this discrepancy is proposed: Schlegel and Gates' methods, which well correlate Ccr in chronic renal failure cases, in severe renal failure on obstructive basis, of recent onset, could not indicate the effective glo…