Study of the reaction 35Cl(n,γ)36Cl

1970 ◽  
Vol 48 (10) ◽  
pp. 1130-1139 ◽  
Author(s):  
L. B. Hughes ◽  
T. J. Kennett
Keyword(s):  
Gamma Radiation ◽  
Gamma Ray ◽  
Neutron Separation Energy ◽  
Transition Rates ◽  
Separation Energy ◽  
Average Precision ◽  
The Absolute ◽  
Reaction 35Cl

The gamma radiation from the 35Cl(n,γ)36Cl reaction has been studied using a Ge(Li) spectrometer. A total of 130 gamma-ray transitions was observed with an average precision of 2 keV. The neutron separation energy was found to be 8580.6 ± 1.0 keV. An examination of the partial radiative widths revealed that the ratio of E1 to M1 radiation agreed well with the ratio obtained from other measurements of E1 and M1 transition rates but the absolute values were enhanced by a factor of 10.

STUDY OF THE 31P(n, γ)32P REACTION

1967 ◽  
Vol 45 (9) ◽  
pp. 3039-3054 ◽  
Author(s):  
H. Lycklama ◽  
T. J. Kennett
Keyword(s):  
Gamma Radiation ◽  
Degrees Of Freedom ◽  
Neutron Separation Energy ◽  
Separation Energy ◽  
Weak Correlation ◽  
Average Precision

A total of 64 transitions were observed with an average precision of 2 keV in studying the gamma radiation from the 31P(n, γ)32P reaction using a Ge(Li) spectrometer. The neutron separation energy was measured to be 7 936 ± 1 keV. Comparison with (d, p) results indicates only a weak correlation between (n, γ) and (d, p) reduced widths. The reduced radiation widths follow a x2 distribution of ~2 degrees of freedom.

A STUDY OF THE GAMMA RADIATION FOLLOWING THERMAL NEUTRON CAPTURE BY SILICON

1967 ◽  
Vol 45 (5) ◽  
pp. 1871-1884 ◽  
Author(s):  
H. Lycklama ◽  
L. B. Hughes ◽  
T. J. Kennett
Keyword(s):  
Gamma Radiation ◽  
Thermal Neutron ◽  
Single Particle ◽  
Neutron Capture ◽  
Decay Scheme ◽  
Time Correlation ◽  
Neutron Separation Energy ◽  
Thermal Neutron Capture ◽  
Separation Energy

A study of the gamma radiation following thermal neutron capture by natural silicon has been conducted. Precise energy measurements were obtained using a Ge(Li) counter and a decay scheme was constructed using the time correlation results obtained with a Ge(Li)–NaI(Tl) spectrometer. The neutron separation energy was found to be 8 474 ± 1 keV for 29Si. An examination of the reduced radiation widths revealed that, while E1 and E2 radiation agreed well with the single-particle estimate, the M1 strength was hindered by a factor of from 10 to 100.

Intensity anomaly in the (d,pγ) reaction

1970 ◽  
Vol 48 (6) ◽  
pp. 687-708 ◽  
Author(s):  
G. A. Bartholomew ◽  
I. Bergqvist ◽  
E. D. Earle ◽  
A. J. Ferguson
Keyword(s):  
Excitation Energy ◽  
Gamma Rays ◽  
Single Particle ◽  
Gamma Ray ◽  
Strength Function ◽  
Neutron Separation Energy ◽  
Separation Energy ◽  
Excitation Energies

The spectra of gamma rays detected in coincidence with protons from the (d,pγ) reaction in elements [Formula: see text] and [Formula: see text] have been measured in gross structure with a NaI detector. The region of excitation energies covered in the product nuclei was from 0.8 MeV to about the neutron separation energy, typically 7 MeV. The gamma-ray anomalous bump at about 5.5 MeV was found from regions near the separation energy with an intensity comparable to that previously observed in (n,γ) reactions. By gating techniques the decay of many contiguous intervals of excitation energy, populated in the reaction, was studied. From the results, a strength function for gamma rays between 0.8 and 7 MeV approximately was extracted for Au, where the bump is prominent, and for Ta where the bump is essentially absent. In the particular case of 206Pb(d,pγ)207Pb, the gamma-ray spectra are interpreted in terms of the decay of known single particle states. An interpretation of the intensity anomaly in terms of doorway states is discussed.

THE LEVEL STRUCTURE OF 104Rh OBSERVED IN THERMAL NEUTRON CAPTURE

1966 ◽  
Vol 44 (9) ◽  
pp. 2041-2051 ◽  
Author(s):  
L. B. Hughes ◽  
T. J. Kennett ◽  
W. V. Prestwich
Keyword(s):  
Energy Range ◽  
Thermal Neutron ◽  
Neutron Capture ◽  
Gamma Ray ◽  
Level Structure ◽  
Neutron Separation Energy ◽  
Thermal Neutron Capture ◽  
Separation Energy

The capture gamma-ray spectrum of the reaction 103Rh(n, γ)104Rh has been studied using a Ge(Li) spectrometer. The energy range covered was from 3 600 to 7 500 keV with an average resolution of 12 keV. A total of 100 transitions were observed and the neutron separation energy was found to be 6 999 ± 3 keV.

Effect of Gamma Radiation on Structural, Optical and Electrical Properties of nanostructured CdHgTe Thin Films

2018 ◽  
Vol 1 (1) ◽  
pp. 26-31 ◽  
Author(s):  
B Babu ◽  
K Mohanraj ◽  
S Chandrasekar ◽  
N Senthil Kumar ◽  
B Mohanbabu
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Electrical Properties ◽  
Gamma Radiation ◽  
Glass Substrate ◽  
Gamma Ray ◽  
Optical And Electrical Properties ◽  
Deposition Technique ◽  
Polycrystalline Structure ◽  
Dc Electrical Conductivity

CdHgTe thin films were grown onto glass substrate via the Chemical bath deposition technique. XRD results indicate that a CdHgTe formed with a cubic polycrystalline structure. The crystallinity of CdHgTe thin films is gradually deteriorate with increasing the gamma irradiation. EDS spectrums confirms the presence of Cd, Hg and Te elements. DC electrical conductivity results depicted the conductivity of CdHgTe increase with increasing a gamma ray dosage

Development of a simultaneous imaging system to measure the optical and gamma ray images of Ir-192 source for high-dose-rate brachytherapy

2021 ◽  
Vol 16 (12) ◽  
pp. T12005
Author(s):  
J. Nagata ◽  
S. Yamamoto ◽  
Y. Noguchi ◽  
T. Nakaya ◽  
K. Okudaira ◽  
...  
Keyword(s):  
Dose Rate ◽  
Spatial Resolution ◽  
Gamma Camera ◽  
Gamma Ray ◽  
Imaging System ◽  
High Dose Rate ◽  
High Dose ◽  
Cmos Camera ◽  
Absolute Position ◽  
The Absolute

Abstract In high-dose-rate (HDR) brachytherapy, verification of the Ir-192 source's position during treatment is needed because such a source is extremely radioactive. One of the methods used to measure the source position is based on imaging the gamma rays from the source, but the absolute position in a patient cannot be confirmed. To confirm the absolute position, it is necessary to acquire an optical image in addition to the gamma ray image at the same time as well as the same position. To simultaneously image the gamma ray and optical images, we developed an imaging system composed of a low-sensitivity, high-resolution gamma camera integrated with a CMOS camera. The gamma camera has a 1-mm-thick cerium-doped yttrium aluminum perovskite (YAIO3: YAP(Ce)) scintillator plate optically coupled to a position-sensitive photomultiplier (PSPMT), and a 0.1-mm-diameter pinhole collimator was mounted in front of the camera to improve spatial resolution and reduce sensitivity. We employed the concept of a periscope by placing two mirrors tilted at 45 degrees facing each other in front of the gamma camera to image the same field of view (FOV) for the gamma camera and the CMOS camera. The spatial resolution of the imaging system without the mirrors at 100 mm from the Ir-192 source was 3.2 mm FWHM, and the sensitivity was 0.283 cps/MBq. There was almost no performance degradation observed when the mirrors were positioned in front of the gamma camera. The developed system could measure the Ir-192 source positions in optical and gamma ray images. We conclude that the developed imaging system has the potential to measure the absolute position of an Ir-192 source in real-time clinical measurements.

scholarly journals Testing for presence of radioactivity in BC Pacific Ocean’s seafood supply

2014 ◽  
Author(s):  
Amy Luan ◽  
BCIT School of Health Sciences, Environmental Health ◽  
Bobby Sidhu ◽  
Abderrachid Zitouni
Keyword(s):  
Pacific Ocean ◽  
Gamma Radiation ◽  
Nuclear Power ◽  
Gamma Ray ◽  
Gamma Ray Spectrometer ◽  
The Pacific ◽  
Two Samples ◽  
Seafood Products ◽  
The Pacific Ocean ◽  
Fish And Shellfish

  Abstract: Due to the Fukushima Daiichi Nuclear power plant incident in March 2011, large quantities of contaminated water were released to the Pacific Ocean in Japan. The severity of contamination on the marine environment is unclear, therefore, the public is concerned with the possible internal radiation exposure from ingesting contaminated seafood products caught in the Pacific Ocean. This study was aimed to investigate the presence or absence of gamma radioactivity in commonly consumed seafood products from B.C. In total, ten different species of fish and three different species of shellfish were selected for analysis. For each species of fish, two samples were collected and each sample was from a different local seafood market. For each species of shellfish, ten samples were collected from three different sources. Using the portable GR-135 Plus gamma ray spectrometer, the samples were tested and analyzed for the presence of Fukushima radionuclides, particularly Cesium-137 (Cs-137) and Cesium- 134 (Cs-134).Based on the analyzed fish and shellfish, no gamma radiation was detected. The detector did not identify any gamma radiation over the normal background readings.  

THE TOTAL GAMMA RAY ACTIVITY OF SEDIMENTARY ROCKS AS INDICATED BY GEIGER COUNTER DETERMINATIONS

Geophysics ◽  
1944 ◽  
Vol 9 (2) ◽  
pp. 180-216 ◽  
Author(s):  
W. L. Russell
Keyword(s):  
Gamma Radiation ◽  
Frequency Distribution ◽  
Gamma Ray ◽  
Sedimentary Rocks ◽  
Geiger Counter ◽  
Rock Samples

Geiger counter determinations of the gamma ray intensity of 510 rock samples have been made to determine the average radioactivity and frequency distribution of radioactivities of the various types of sedimentary rocks. The results, expressed in units of gamma ray intensity, show that limestones, sandstones and dolomites are of relatively low radioactivity, shales much higher, and black bituminous shales highest of all. The new data on the gamma radiation of the sediments may be used to improve the interpretation of radioactivity logs and to determine the value of surface radioactivity surveys.

Study of a single line of sight gamma ray diagnostics for measurements of the absolute gamma ray emission from JET

2021 ◽  
Vol 16 (12) ◽  
pp. C12019
Author(s):  
G. Marcer ◽  
M. Nocente ◽  
L. Giacomelli ◽  
G. Gorini ◽  
E. Perelli Cippo ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Neutron Emission ◽  
Fusion Reaction ◽  
Branching Ratio ◽  
Plasma Source ◽  
Line Of Sight ◽  
Extended Plasma ◽  
Absolute Efficiency ◽  
The Absolute ◽  
Gamma Ray Emission

Abstract The fusion power produced in a DT thermonuclear reactor is currently determined by measuring the absolute 14 MeV neutron yield of the D(T, α)n fusion reaction. Measurements of 17 MeV gamma rays born from the much less probable D(T, 5He)γ reaction (branching ratio of ∼10−5) have been proposed as an alternative independent method to validate the neutron counting method and also to fulfill the requests of the nuclear regulator for licensing ITER DT operations. However, the development of absolute 17 MeV gamma ray emission measurements entails a number of requirements, such as: (i) knowledge of the 17 MeV gamma ray to 14 MeV neutron emission branching ratio; (ii) the simulation of the gamma ray transport from the extended plasma source to the gamma ray detectors; (iii) a careful determination of the absolute efficiency of previously calibrated gamma ray spectrometers. In this work, we have studied the possibility to infer the global gamma ray emission rate from measurements made with a 3″ × 6″ LaBr3 spectrometer installed at the end of a collimated tangential line of sight at the JET tokamak and using the neutron emission from deuterium plasmas of the most recent experimental campaigns. Results show that 17 MeV gamma ray fluxes at the end of this tangential line of sight have a weak dependence (less than 5%) on the plasma profile and can therefore be used to infer the total emission from the plasma.

Sign in / Sign up

Export Citation Format

Share Document