scholarly journals DELAYED PROTONS FOLLOWING THE DECAY OF ARGON-33

1965 ◽  
Vol 43 (3) ◽  
pp. 418-421 ◽  
Author(s):  
J. C. Hardy ◽  
R. I. Verrall
Keyword(s):  
Lithium Chloride ◽  
Half Life ◽  
Proton Spectrum ◽  
Proton Bombardment

The delayed-proton precursor 33Ar has been produced by proton bombardment of a lithium chloride target in the internal beam of the McGill synchrocyclotron. The half-life of 33Ar was measured to be (178 ± 10) msec. To explain the delayed proton spectrum, two new levels, at 5.55 and 7.55 MeV, in 33Cl are proposed. It is also proposed that the former is the expected first T = 3/2 state in that nucleus.

DISCOVERY OF Pr137

1958 ◽  
Vol 36 (11) ◽  
pp. 1483-1486 ◽  
Author(s):  
Carl Dahlstrom ◽  
J. S. Foster ◽  
A. L. Thompson
Keyword(s):  
Gamma Rays ◽  
Half Life ◽  
Chemical Separation ◽  
Mass Determination ◽  
Proton Bombardment ◽  
End Point ◽  
Neutron Deficient Isotope ◽  
Positron Spectrum

The neutron-deficient isotope Pr137 has been discovered by proton bombardment of natural cerium, chemical separation, and mass determination. Its half-life is 1.5 ± 0.1 hours and the end point of its positron spectrum is 1.7 ± 0.1 Mev. No gamma rays were observed.

The half-life of the first metastable state in 90Nb

1969 ◽  
Vol 47 (8) ◽  
pp. 949-951 ◽  
Author(s):  
J. S. Geiger ◽  
R. L. Graham ◽  
M. W. Johns
Keyword(s):  
Metastable State ◽  
Half Life ◽  
Published Data ◽  
Proton Bombardment ◽  
Tentative Assignment

A delayed γ activity, Eγ = 122.2 ± 0.2 keV, t1/2 = 18.82 ± 0.09 s, is observed following 10 MeV proton bombardment of targets of natural Zr and of natural Hf in which Zr is present as a contaminant. The present results taken together with other recently published data show that this activity arises from 90Zr(p,n)90Nbm. The tentative assignment of this 122 keV γ activity to 179Ta, which we proposed in an earlier publication, is withdrawn.

EFFECT OF LITHIUM ON DEIODINATING ACTIVITY OF VARIOUS RAT TISSUES IN VITRO

1974 ◽  
Vol 76 (2) ◽  
pp. 260-272 ◽  
Author(s):  
P. T. Männistö
Keyword(s):  
Amino Acids ◽  
Lithium Chloride ◽  
Half Life ◽  
Rat Tissues ◽  
Biological Half Life ◽  
Liver And Kidney ◽  
Licl Treatment

ABSTRACT The effect of lithium chloride (LiCl) on the deiodination of iodotyrosines, on the degradation of 125I-L-thyroxine (125I-L-T4) in vitro and on the disappearance of exogenous 125I-L4 and 125I-rat-TSH in vivo was studied in rats. Iodotyrosine deiodination was studied in vitro with three techniques. The whole thyroid lobes were not satisfactory as substrate. When a diluted mixture of prelabelled iodo-amino acids was used as substrate, thyroid homogenates deiodinated iodotyrosines. The reaction was inhibited by boiling and by 3,5-dinitro-L-tyrosine (DNT), but LiCl (2 × 10−2 m) had no effect. When 125I-3-iodo-L-tyrosine (125I-L-MIT) served as substrate, increasing concentrations of thyroid homogenates showed an increasing deicdinating activity, which was stimulated by NADP (1.5 × 10−4 m). Inhibitors of dehalogenase DNT (10−4 and 10 −3 m) and menandione (10−4 m) inhibited deiodination, but LiCl (5×10−3 − 0.1 m) was again without effect. The degradation of 125I-L-T4 by liver and kidney homogenates was inhibited by LiCl (5 × 10−3 − 0.1 m). The disappearance of 125I-L-T4 was studied in rats treated with LiCl for 1 – 4 or 60 – 64 days in vivo. The half-lives were as follows: at 1 –4 days, the control rats 15.9 ± 1.3 h and the LiCl treated rats 19.1 ± 2.1 h (P < 0.05) and at 60 – 64 days 11.2 ± 2.0 h and 66.8 ± 12.3 h (P < respectively. The prolonged half-life in the LiCl treated rats was not due to the decreased excretion of radioactivity in the urine or faeces. The biological half-life of 125I-rat-TSH (11.4 ± 3.2 min) was not modified by LiCl treatment for 5 days. It can be concluded that the antithyroid effect of LiCl neither originates from the inhibition of iodotyrosine deiodination nor from the change in the half-life of TSH. The half-life of thyroxine is prolonged by LiCl, an effect which is perhaps due to the decreased degradation of thyroxine by tissues.

NEW INFORMATION ON THE EMISSION OF DELAYED PROTONS FOLLOWING THE DECAY OF 17Ne, 21Mg, AND 25Si

1965 ◽  
Vol 43 (9) ◽  
pp. 1671-1677 ◽  
Author(s):  
J. C. Hardy ◽  
R. E. Bell
Keyword(s):  
Proton Spectrum ◽  
Proton Bombardment ◽  
Additional Peak ◽  
New Information

The spectrum of delayed protons from the decay of 17Ne has been extended up to 8 MeV; an additional peak corresponding to the decay of a level at (7.99 ± 0.05) MeV in 17F was found. The delayed-proton spectrum observed following 80-MeV proton bombardment of magnesium and sodium targets, previously attributed solely to the decay of 21Mg, has been shown to contain components due to the decay of 17Ne. The lifetime of 21Mg was remeasured to be (121 ± 5) msec. The contribution of other decays was shown to be small compared with that of 25Si in the delayed-proton spectrum observed following bombardment of aluminium and silicon targets at 80 MeV.

Production and radioassay of Tc-94m for PET studies

2003 ◽  
Vol 91 (10) ◽  
Author(s):  
Lawrence P. Szajek ◽  
M. Der ◽  
J. Divel ◽  
B. X. Huang ◽  
P. Plascjak ◽  
...  
Keyword(s):  
Half Life ◽  
Branching Ratio ◽  
Proton Bombardment ◽  
Point Energy ◽  
End Point ◽  
Quantitative Measurements ◽  
Short Half Life

SummaryThe radionuclide Tc-94m with its positron branching ratio of 72, positron end-point energy of 2.47MeV, and relatively short half-life of 52 minutes is suitable for quantitative measurements using PET. Tc-94m can be produced by proton bombardment of isotopically enriched [Mo-94]MoO

SCANDIUM ISOTOPE OF MASS 42

1957 ◽  
Vol 35 (10) ◽  
pp. 1190-1198 ◽  
Author(s):  
J. A. R. Cloutier ◽  
A. Henrikson
Keyword(s):  
Half Life ◽  
Ground States ◽  
Proton Bombardment ◽  
End Point ◽  
Positron Emission

A member of the odd–odd Z = N family, Sc42, has been produced by proton bombardment of a calcium target greatly enriched in Ca42. The positron emission, which alone is observed, has a measured half-life of 0.68 second, end point 4.8. Mev., and threshold 6.8 Mev. The superallowed transition is between ground states (J, T) tentatively described as Sc42 (0+, 1) and Ca42 (0+, 1).

The Half-Life of Mindless Psychology

1991 ◽  
Vol 36 (5) ◽  
pp. 455-455
Author(s):  
Michael J. Mahoney
Keyword(s):  
Half Life

C-fos Expression in the Brain Following Lithium Chloride Induced-Illness

2006 ◽  
Author(s):  
Katie M. Albanos ◽  
Steve Reilly ◽  
Justin R. St. Andre
Keyword(s):  
Lithium Chloride ◽  
Fos Expression ◽  
The Brain
Sign in / Sign up

Export Citation Format

Share Document