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.

RADIOACTIVE DECAY OF Au200

1959 ◽  
Vol 37 (4) ◽  
pp. 385-395 ◽  
Author(s):  
J. C. Roy ◽  
L. P. Roy
Keyword(s):  
Gamma Rays ◽  
Half Life ◽  
Decay Scheme ◽  
Radioactive Decay ◽  
End Point ◽  
Gamma Radiations

The half-life of Au200 has been measured to be 48.4 ± 0.3 minutes. The beta radiations emitted in the decay of Au200 have been studied by absorption in aluminum, and the gamma radiations with a multichannel scintillation spectrometer. Two beta rays with end-point energies of 2.25 ± 0.20 and 0.7 ± 0.1 Mev and respective abundance of (75 ± 3)% and (25 ± 3)% were detected. Three gamma rays with energies of 0.367, 1.23, and 1.60 Mev were observed. It was established that the 0.367- and 1.23-Mev gamma rays are in coincidence. A decay scheme for Au200 is proposed.

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).

COINCIDENCE STUDIES OF THE DECAY OF INDIUM 114

1954 ◽  
Vol 32 (1) ◽  
pp. 35-48 ◽  
Author(s):  
M. W. Johns ◽  
C. C. McMullen ◽  
R. J. Donnelly ◽  
S. V. Nablo
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Branching Ratio ◽  
Coincidence Circuit ◽  
Capture Process ◽  
End Point ◽  
Inner Bremsstrahlung ◽  
Positron Spectrum

A coincidence circuit of resolving time 3 × 10−9 sec. has been used to examine the decay of In114. Coincidence experiments are described to show that of the five gamma-rays which follow the K-capture process the 0.722 and 1.300 Mev. radiations are both in cascade with the 0.556 Mev. gamma-ray and that the spins and parities of the excited levels of energy 0.556, 1.278, and 1.856 Mev. in Cd114 are 2 +, 2 +, and 0 +, respectively. The observed beta–gamma coincidences may be ascribed to a combination of inner bremsstrahlung associated with the strong 2 Mev. β− transition and a weak β− group of intensity less than 1 × 10−3 beta per disintegration and end point about 0.8 Mev. The positron spectrum has a branching ratio of 4 ± 1 × 10−5 and an end point between 1.0 and 1.4 Mev.

Gamma Rays fromGa65Decay and Half-Life of the 54-kev Level ofZn65

1960 ◽  
Vol 120 (6) ◽  
pp. 2072-2080 ◽  
Author(s):  
L. S. August ◽  
J. F. Friichtenicht
Keyword(s):  
Gamma Rays ◽  
Half Life

Gamma-Rays from Light Elements Due to Proton Bombardment

1937 ◽  
Vol 51 (9) ◽  
pp. 691-698 ◽  
Author(s):  
R. G. Herb ◽  
D. W. Kerst ◽  
J. L. McKibben
Keyword(s):  
Gamma Rays ◽  
Light Elements ◽  
Proton Bombardment

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.

Gamma-Rays from Fluorine Due to Proton Bombardment

1938 ◽  
Vol 54 (6) ◽  
pp. 398-408 ◽  
Author(s):  
E. J. Bernet ◽  
R. G. Herb ◽  
D. B. Parkinson
Keyword(s):  
Gamma Rays ◽  
Proton Bombardment

GAMMA RADIATION FROM THE PROTON BOMBARDMENT OF BORON TEN

1956 ◽  
Vol 34 (4) ◽  
pp. 381-388 ◽  
Author(s):  
G. B. Chadwick ◽  
T. K. Alexander ◽  
J. B. Warren
Keyword(s):  
Angular Distribution ◽  
Cross Section ◽  
Gamma Rays ◽  
Lower Energy ◽  
Sodium Iodide ◽  
Scintillation Counter ◽  
Proton Bombardment ◽  
Broad Resonance ◽  
Energy Formula ◽  
Cascade Transitions

The gamma rays resulting from the bombardment of B10 with protons of energies from 0.5 to 2.0 Mev. have been observed with a sodium iodide scintillation counter. Capture radiation, of energy[Formula: see text]showed a broad resonance at Ep = 1135 ± 15 kev. At this energy, the radiation had an angular distribution of the form 1 + (0.50 ± 0.05)cos2θ and a total cross section (3.5 ± 1.0)10−30 cm.2 Several lower energy radiations were also observed and assigned tentatively to cascade transitions in C11.The cross section for the 430 kev. radiation from the reaction B10(p, αγ)Be7 was found to be 0.21 ± 0.05 barn at Ep = 1.52 Mev. This radiation was found to be isotropic.

Half-life and high-energy positon end point of Sc40

1962 ◽  
Vol 33 ◽  
pp. 47-51 ◽  
Author(s):  
Felix Schweizer ◽  
J.Reginald Richardson
Keyword(s):  
Half Life ◽  
High Energy ◽  
End Point
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