Efficiency calibration of a Ge detector for 30- to 2800-keV γ-rays

1983 ◽  
Vol 34 (2) ◽  
pp. 555
Author(s):  
R.G. Helmer
Keyword(s):  
Efficiency Calibration ◽  
Γ Rays ◽  
Ge Detector

The branching ratio in the decay of 7Be

1984 ◽  
Vol 62 (11) ◽  
pp. 1139-1144 ◽  
Author(s):  
H. C. Evans ◽  
I. P. Johnstone ◽  
J. R. Leslie ◽  
W. McLatchie ◽  
H.-B. Mak ◽  
...  
Keyword(s):  
Axial Vector ◽  
Branching Ratio ◽  
Experimental Result ◽  
Vector Coupling ◽  
A Value ◽  
Axial Vector Coupling ◽  
Absolute Efficiency ◽  
Γ Rays ◽  
Ge Detector ◽  
The Absolute

A measurement of the branching ratio for electron capture (EC) decay of 7Be to the 478-keV level in 7Li is reported. The reaction 10B(p, α)7Be was used and the 7Be recoils were detected and stopped in a particle detector thin enough to transmit the protons. The absolute γ-ray emission rate of 478-keV γ rays from the implanted detector was determined with a well-shielded intrinsic Ge detector. The absolute efficiency of the Ge detector was established with 22Na, 137Cs, and 88Y standard sources. A value of 11.4 ± 0.7% was obtained for the EC branch to the 478-keV state. Calculations suggest that the axial vector coupling constant GA must be reduced by a factor of 0.94 ± 0.02 to obtain agreement with the experimental result.

METHOD OF QUANTITATIVE ANALYSIS OF FLUORINE IN ENVIRONMENTAL SAMPLES USING A PURE-Ge DETECTOR

2004 ◽  
Vol 14 (01n02) ◽  
pp. 9-18 ◽  
Author(s):  
K. SERA ◽  
K. TERASAKI ◽  
Y. SAITOH ◽  
J. ITOH ◽  
S. FUTATSUGAWA ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Environmental Samples ◽  
Present Method ◽  
Domestic Animals ◽  
Measuring System ◽  
X Rays ◽  
Efficiency Curve ◽  
Elemental Concentrations ◽  
Γ Rays ◽  
Ge Detector

We recently developed and reported a three-detector measuring system making use of a pure-Ge detector combined with two Si ( Li ) detectors. The efficiency curve of the pure-Ge detector was determined as relative efficiencies to those of the existing Si ( Li ) detectors and accuracy of it was confirmed by analyzing a few samples whose elemental concentrations were known. It was found that detection of fluorine becomes possible by analyzing prompt γ-rays and the detection limit was found to be less than 0.1 ppm for water samples. In this work, a method of quantitative analysis of fluorine has been established in order to investigate environmental contamination by fluorine. This method is based on the fact that both characteristic x-rays from many elements and 110 keV prompt γ-rays from fluorine can be detected in the same spectrum. The present method is applied to analyses of a few environmental samples such as tealeaves, feed for domestic animals and human bone. The results are consistent with those obtained by other methods and it is found that the present method is quite useful and convenient for investigation studies on regional pollution by fluorine.

Decay properties of 181Ir

1978 ◽  
Vol 56 (3) ◽  
pp. 321-326 ◽  
Author(s):  
I. M. Ladenbauer-Bellis ◽  
P. Sen ◽  
H. Bakhru
Keyword(s):  
Half Life ◽  
Decay Scheme ◽  
Heavy Ion ◽  
Heavy Ion Reactions ◽  
X Ray ◽  
Decay Properties ◽  
Helium Jet ◽  
Γ Rays ◽  
Ge Detector ◽  
Γ Ray

181Ir activity was produced via the following heavy-ion reactions: 169Tm (16O,4n)181Ir and 169Tm(19F,7n)181Pt (51 s) decaying to 181Ir. The half-life of 181Ir was found to be 4.90 ± 0.15 min. Singles and coincidence γ-ray measurements were performed using 30–40 cm3 Ge(Li) detectors. X-Ray measurements were carried out using an intrinsic Ge-detector. Additionally the helium jet system was used to study the properties of this isotope. The following γ rays were found to belong to the decay of 181Ir: 19.6, 65.3, 93.8, 107.6, 117.9, 123.5, 184.6, 189.9, 227.0, 231.6, 239.2, 309.0, 318.9, 350.5, 352.8, 375.2, 576.5, 700.1, 871.2, 1182.3, 1192.6, 1347.1, 1381.0, 1528.8, 1545.0, 1565.6, 1593.4, 1639.6, 1646.4, 1652.5, and 1714.9 keV. A tentative decay scheme is proposed for 181Ir, verifying levels in l8lOs that have been obtained by reaction work. The proposed decay scheme as well as spin and parity assignments of some of the 181Os levels are discussed.

scholarly journals Radiochemical Separation of 161Tb from Gd/Tb Matrix Using Ln Resin Column

2018 ◽  
Vol 16 (3) ◽  
pp. 283 ◽  
Author(s):  
Azmairit Aziz ◽  
Widya Tania Artha
Keyword(s):  
Optimum Condition ◽  
Radiochemical Separation ◽  
Resin Column ◽  
Chromatography Method ◽  
Hno3 Solution ◽  
Radionuclide Purity ◽  
Γ Rays ◽  
Ge Detector ◽  
Preliminary Study ◽  
Ln Resin

Terbium-161 (161Tb) is a potential radiolanthanide due to its favorable properties for treatment small size of cancer. Preliminary study on radiochemical separation of 161Tb from Gd/Tb matrix using Ln resin column based on extraction chromatography method has been carried out. 161Tb radionuclide was produced by irradiation of natural Gd2O3 target through neutron thermal bombardment at G.A. Siwabessy Multipurpose Reactor. Fractions eluted from the column containing Gd/Tb matrix of irradiated natural Gd2O3 target were identified and quantified using a γ-rays spectrometer with HP-Ge detector coupled to a multichannel analyzer. The results show that the optimum condition on 161Tb separation from irradiated Gd2O3 target with radionuclide purity 99.27 ± 0.30% was obtained using HNO3 solution with concentration of 0.8 and 3 N to separate gadolinium and terbium isotope, respectively. The yield of 161Tb obtained from the separation was 61.21 ± 2.05% and Gd recovered was 97.15 ± 2.23%. Based on this experiment, 161Tb has been separated from irradiated natural gadolinium oxide target with high radionuclide purity.

A THREE-DETECTOR MEASURING SYSTEM USING A PURE-Ge DETECTOR

2003 ◽  
Vol 13 (01n02) ◽  
pp. 23-35 ◽  
Author(s):  
K. SERA ◽  
K. TERASAKI ◽  
S. MURAO ◽  
S. FUTATSUGAWA ◽  
Y. SAITOH
Keyword(s):  
High Performance ◽  
Point Of View ◽  
Measuring System ◽  
Dead Layer ◽  
X Rays ◽  
Light Elements ◽  
Efficiency Curve ◽  
High Energies ◽  
Γ Rays ◽  
Ge Detector

A three-detector measuring system making use of a pure- Ge detector combined with two Si ( Li ) detectors has been developed. The efficiency curve of the pure- Ge detector has been determined easily as relative efficiencies to those of the existing Si ( Li ) detectors, since this system allows us to analyze a sample with the pure- Ge and the Si ( Li ) detectors simultaneously under the same irradiating conditions. It is found that detection efficiencies of the pure- Ge detector decrease just above the absorption edge of Ge owing to absorption of X-rays in the dead layer of the detector. Accuracy of the efficiency curve thus obtained was confirmed by analyzing a few samples whose elemental concentrations are known. It is confirmed that a pure- Ge detector can be used in place of a Si ( Li ) detector for the purpose of analysis of elements Z ≧ 19, since its energy resolution is almost equal to that of a high-performance Si ( Li ) detector and efficiencies at high energies are far better. Moreover, it becomes possible to detect prompt γ-rays and to analyze light elements such as fluorine, which arouses much interest from the point of view of environmental contamination. Detection limit of fluorine is found to be less than 0.1 ppm for water samples.

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