scholarly journals Empirical Formulae to Calculate the Half-life of E1 Gamma Transitions for Selected Isotopes

2017 ◽  
Vol 4 (ICBS Conference) ◽  
pp. 256-268
Author(s):  
Ali Ahmed ◽  
Muhammad Ahmed ◽  
Muhammad Abdulqader
Keyword(s):  
Half Life ◽  
Gamma Transitions

Study of Delayed States in 94Nb, 108Ag, and 110Ag

1971 ◽  
Vol 49 (6) ◽  
pp. 747-755 ◽  
Author(s):  
S. C. Gujrathi ◽  
J. M. d'Auria ◽  
R. G. Korteling
Keyword(s):  
High Resolution ◽  
Level Scheme ◽  
Half Life ◽  
Gamma Transition ◽  
Low Energy ◽  
X Ray ◽  
Upper Limits ◽  
Energy Gamma ◽  
Gamma Transitions ◽  
First Time

The lifetimes and energies associated with low-energy gamma transitions from the 93Nb(n,γ)94Nb, 107Ag(n,γ)108Ag, and 109Ag(n,γ)110Ag reactions have been studied using a high-resolution Ge(Li) X-ray spectrometer. New weak transitions are observed in the decay of 110Ag at 30.84, 38.19, 41.78, and 136.65 keV, while intense gamma transitions at 105.6, 235.8, and 266.95 keV are resolved into doublets. The half-life of the state involving the intense 117.47 keV transition in 110Ag and the 215 keV transition in 108Ag is confirmed as 36.5 ± 2.0 ns and 54 ± 8 ns, respectively, while a new delayed state associated with the gamma transition of 99.404 keV (T1/2 = 30 ± 5 ns) in 94Nb is observed for the first time. The upper limits for the half-lives involving most of the intense transitions in all the three isotopes are also reported. A level scheme is proposed and discussed for 108Ag.

scholarly journals Prompt Response Function (PRF) of Lifetime Measurement in the 2+ State of 192Os Nuclei Energy Levels from Triple-Gamma Coincidence Techniques

2020 ◽  
pp. 257-261
Author(s):  
Terver Daniel ◽  
Stanimir Kisyov ◽  
Patrick Regan ◽  
Nicu Marginean ◽  
Zsolt Podolyak ◽  
...  
Keyword(s):  
Response Function ◽  
Half Life ◽  
Energy Levels ◽  
Mean Value ◽  
Prompt Gamma ◽  
Difference Spectra ◽  
Gamma Coincidence ◽  
Gamma Transitions ◽  
Neutron Transfer Reaction ◽  
Prompt Response

The effective prompt response function full width at half maximum, PRF FWHM of 637 ps (obtained from the prompt gamma pairs of 477 keV and 700 keV associated with the yrast 2+ state in 206Po), and 1007 ps (obtained from the Compton gamma pairs of 189 keV and 237 keV associated with the 192Os(18O,16O)194Os 2 neutron transfer reaction) were used in fitting the time difference spectra obtained from the gamma coincident pairsof 206 keV and 374 keV in a symmetrised LaBr3(Ce) associated with the gamma transitions in 192Os, using the Half-life program. The values of half-life measured by fitting these PRF FWHM of 637 ps and 1007 ps separately show an excellent agreement of 282(16) ps and 272(21) ps, respectively, which correspond to the global half-life value of 282(4) ps for the 192Os. The mean value of 277(12) ps from these two measurements was used in calculating the B(E2; IL ->IL-2) of 4233(114) e2fm4, which is equivalent to be 81(19) W.u.

Decay of 162,164,165Lu isotopes

1978 ◽  
Vol 56 (6) ◽  
pp. 786-792 ◽  
Author(s):  
C. Burman ◽  
P. Sen ◽  
H. Bakhru
Keyword(s):  
High Resolution ◽  
Half Life ◽  
Heavy Ion ◽  
Published Data ◽  
Yale University ◽  
Heavy Ion Accelerator ◽  
Ion Accelerator ◽  
Gamma Transitions

The decay of the short lived 162,164,165Lu isotopes have been studied using high resolution Ge(Li) detectors in singles and coincidence. The Lu isotopes have been produced using an oxygen beam from the Heavy Ion Accelerator at Yale University via the reactions 151,153Eu(16O,Xn)162,164,165Lu. New gamma transitions belonging to the decay of 165Lu (12 min), 164Lu (3.1 min), and 162Lu (1.4 min) isotopes have been identified by following their half-lives. Based on the singles, coincidence, and half-life measurements, tentative level schemes for the 164,165Yb isotopes have been presented. Our results have been compared with the published data.

A new assignment for the 9/2+[624] state in 181Hf from the 179Hf(t, p)181Hf reaction

1984 ◽  
Vol 62 (2) ◽  
pp. 192-197 ◽  
Author(s):  
D. G. Burke ◽  
J. C. Waddington ◽  
G. Løvhøiden ◽  
T. F. Thorsteinsen
Keyword(s):  
Ground State ◽  
Half Life ◽  
Low Energy ◽  
Angular Distributions ◽  
Level Spacing ◽  
Reaction Products ◽  
Negative Results ◽  
Energy Formula ◽  
Gamma Transitions ◽  
Irregular Spacing

Angular distributions of protons from the 179Hf(t, p)181Hf reaction were studied using 15-MeV tritons from the McMaster University tandem Van de Graaff accelerator. The reaction products were analyzed with a magnetic spectrograph and detected with nuclear emulsions. Since the 179Hf target ground state is the 9/2+[624] orbital, a strong L = 0 transition was expected to the 9/2+[624] bandhead in 181Hf, which was previously assigned at 68 keV. However, the only L = 0 transition observed was to a level at an excitation energy of 600 ± 5 keV, requiring that this new level be assigned as the 9/2+[624] state. An attempt to observe gamma transitions deexciting this level in a (t, pγ) coincidence experiment yielded negative results. This implies that the 600 ± 5 keV level either has a half-life of [Formula: see text] or decays to an isomeric level by means of a low energy [Formula: see text] unobserved transition. The irregular spacing of possible 9/2+[624] band members suggests that the 11/2+[615] orbital is located near the 9/2+[624] state and perturbs the level spacing by Coriolis mixing.

The Half-Life of Mindless Psychology

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

Kinetics of Various 99mTc-Sn-Pyrophosphate Compounds in the Rat

1977 ◽  
Vol 16 (04) ◽  
pp. 157-162 ◽  
Author(s):  
C. Schümichen ◽  
B. Mackenbrock ◽  
G. Hoffmann
Keyword(s):  
Normal Saline ◽  
Half Life ◽  
Compound A ◽  
Short Half Life ◽  
Low Concentrations ◽  
The Stability ◽  
Kinetics Of ◽  
In Vitro Stability

SummaryThe bone-seeking 99mTc-Sn-pyrophosphate compound (compound A) was diluted both in vitro and in vivo and proved to be unstable both in vitro and in vivo. However, stability was much better in vivo than in vitro and thus the in vitro stability of compound A after dilution in various mediums could be followed up by a consecutive evaluation of the in vivo distribution in the rat. After dilution in neutral normal saline compound A is metastable and after a short half-life it is transformed into the other 99mTc-Sn-pyrophosphate compound A is metastable and after a short half-life in bone but in the kidneys. After dilution in normal saline of low pH and in buffering solutions the stability of compound A is increased. In human plasma compound A is relatively stable but not in plasma water. When compound B is formed in a buffering solution, uptake in the kidneys and excretion in urine is lowered and blood concentration increased.It is assumed that the association of protons to compound A will increase its stability at low concentrations while that to compound B will lead to a strong protein bond in plasma. It is concluded that compound A will not be stable in vivo because of a lack of stability in the extravascular space, and that the protein bond in plasma will be a measure of its in vivo stability.

The Effect of Carbimazole Following Radioiodine Therapy on Radiation Dose to the Thyroid

1981 ◽  
Vol 20 (02) ◽  
pp. 72-75 ◽  
Author(s):  
R. Kocak ◽  
R.G. Herbert ◽  
C.R. Squire ◽  
T.M.D. Gimlette
Keyword(s):  
Thyroid Gland ◽  
Radiation Dose ◽  
Half Life ◽  
Radioiodine Therapy

Radioiodine in the thyroid gland after a therapy dose of 131I was measured serially in 7 patients without Carbimazole, and in 11 patients starting Carbimazole 60 mg daily fourteen days after the therapy dose. Effective half-life for radioiodine in the gland initially 5.53±1.08 days fell to 4.26±1.12 days (p < 0.01) during Carbimazole, and returned to 5.83±1.21 days (NS) after stopping the drug. The radiation dose to the thyroid from a given therapy dose of 131I followed by Carbimazole was calculated to be 97% of that without Carbimazole when the drug was started after 14 days, and 90% and 75% when the drug was started after 7 days and 1 day respectively.

Radiation Mould with Radio Isotope Solutions Fluid „Iso-mould”

1961 ◽  
Vol 1 (03) ◽  
pp. 246-257
Author(s):  
M. O. Roxo-Nobre ◽  
D. M. Vizeu
Keyword(s):  
Clinical Practice ◽  
Remote Control ◽  
Lymph Nodes ◽  
Half Life ◽  
Radioactive Substances

SummaryA technique of mouldage, employing fluid radioactive substances is adopted, to replace the radium-moulding in the treatment of large surfaces. The technique is explained in detail, proving its greater safety by remote control and an adjustment of adequate means of protection. Distribution is obtained by means of a serpentine attached to the mould in question, which follows the Paterson-Parker system. The authors believe the distribution of radiation on curved anatomical areas to be much more uniform by mould system than any other process of application of the same radiation of rectilineal propagation, transmitted at greater focus-skin distances. The isotopes used up to now were the La140 and others of reduced half-life, in order to prevent the danger of eventual contaminations. Although the application of the process still has very little clinical practice, the technique is presented with a view to experimentation in extensive superficial tumours, or those of little depth, such as tumours of the skin, breast, penis, thyrreoid and lymph nodes.

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