Determination of the sensitivity of thermoluminescent detectors to thermal neutrons

1985 ◽  
Vol 58 (4) ◽  
pp. 323-324
Author(s):  
Yu. N. Zhilov ◽  
V. G. Erkin ◽  
O. N. Lebedev ◽  
V. A. Kuchumov ◽  
G. A. Tyurin
Keyword(s):  
Thermal Neutrons ◽  
Thermoluminescent Detectors

Determination of dose effect of thermal neutrons on the basis of external ?-radiation

Atomic Energy ◽  
1958 ◽  
Vol 4 (3) ◽  
pp. 401-402 ◽  
Author(s):  
A. G. Istomina ◽  
I. B. Keirim-Markus
Keyword(s):  
Dose Effect ◽  
Thermal Neutrons ◽  
External Radiation

Experimental determination of the14N(n,p)14Creaction cross section for thermal neutrons

2000 ◽  
Vol 61 (6) ◽  
Author(s):  
J. Wagemans ◽  
C. Wagemans ◽  
G. Goeminne ◽  
P. Geltenbort
Keyword(s):  
Experimental Determination ◽  
Cross Section ◽  
Thermal Neutrons

I-129 DETERMINATION IN EVAPORATOR CONCENTRATE USING OXIDATIVE EXTRACTION AND CHROMATOGRAPHIC RESIN

2021 ◽  
Vol 9 (1A) ◽  
Author(s):  
Thiago César De Oliveira ◽  
Roberto Pellacani Guedes Monteiro ◽  
Geraldo Frederico Kastner ◽  
Arno Heeren De Oliveira
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Selective Extraction ◽  
Thermal Neutrons ◽  
X Ray ◽  
Tracer Solution ◽  
Spectrometry Technique ◽  
Chromatographic Resin ◽  
Set Up

Determination of long-lived radionuclides is very important for study of the radioactive waste final deposition. In this work will be studied 129I radionuclide which present 1.6 x 107 years half-life, β-particle-emitting (Emax = 194 keV) and X-ray-emitting (E = 29.78 keV). It’s produced primarily from fission of 235U and 239Pu and for fission induced by thermal neutrons. For this reason, radiochemical procedures for 129I determination in evaporator concentrate wastes from nuclear power plants were carried out. The first procedure was based on oxidative extraction and alkaline absorption and the second one, was based on selective extraction using a chromatographic resin in order to separate iodine from its interferents. After the separation steps, the iodine activity was measured by ultra low gamma spectrometry technique. To set up the yield recovery for 129I, a tracer solution of 129I was used in order to follow the behavior of iodine during the separation steps. The yield recovery for iodine was around 75-80% for the first procedure and 80-85% for the second. The two procedures used mutually, ensure a greater efficiency in the separation of iodine from their respective interferents.

Determination of tritium in Li–Pb alloy irradiated by thermal neutrons with quantitatively analyzing the byproduct 4He

2013 ◽  
Vol 299 (1) ◽  
pp. 733-740 ◽  
Author(s):  
X. S. Li ◽  
G. Y. Wei ◽  
X. P. Ouyang ◽  
Y. F. Liao ◽  
G. Song ◽  
...  
Keyword(s):  
Thermal Neutrons

scholarly journals Determination of Uranium Concentration in child teeth by track detector CR-39 in same middle and south regions of Iraq

2011 ◽  
Vol 8 (4) ◽  
pp. 909-913
Author(s):  
Baghdad Science Journal
Keyword(s):  
Neutron Source ◽  
Uranium Concentration ◽  
Track Detector ◽  
Thermal Neutrons ◽  
Fission Tracks

The study of determing Uranium concentration in samples of teeth is the first of its kind in the Iraq . In this study Uranium concentration has been measured was (32) samples of child teeth distributed on the some of middle and south governorate of Iraq (Muthana – Dekar – Basrah – Najaf – Karbalah – Waset – Babel – Baghdad) . The Uranium concentration in teeth samples has been measured by using fission tracks registration in (CR-39) track detector that caused by the bombardment of (U235) with thermal neutrons falx from (24Am.Be) neutron source that has flux of (5x103n.cm-2S-1). The result obtained show that the Uranium concentrations in governorates were (0.18ppm), (0.172ppm), (0.160ppm), 0.150ppm) (0.89ppm), (0.07ppm) , (0.052ppm), (0.020ppm) (0.089ppm), (0.07ppm) , (0.052ppm) , (0.020ppm) (0.089ppm), (0.07ppm) , (0.052ppm) , (0.20ppm) respectively . As a conclusion from the study of Uranium concentration in Muthana governorate that found to be higher than Dekar and Basrah , Najaf , Karbalah, Waset , Babel and Baghdad . These result are higher thin the Uranium concentrations in one studies in Barazil – Bahia state its (0.016ppm) , and in another study in British about (0.018-0.079ppm).

Determination of the composition of a 3He-4He mixture from the transmission of thermal neutrons

Physica ◽  
1966 ◽  
Vol 32 (3) ◽  
pp. 576-578
Author(s):  
C. Le Pair ◽  
B. Van Laar ◽  
B.O. Loopstra
Keyword(s):  
Thermal Neutrons

scholarly journals MICROSCOPIC DETERMINATION OF BONE PHOSPHORUS BY QUANTITATIVE AUTORADIOGRAPHY OF NEUTRON-ACTIVATED SECTIONS

1965 ◽  
Vol 24 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Jacques Vincent ◽  
Stanislas Haumont ◽  
Joseph Roels
Keyword(s):  
Cortical Bone ◽  
Bone Tissue ◽  
Mineral Composition ◽  
Optical Density ◽  
Absorption Curve ◽  
Thermal Neutrons ◽  
Γ Rays ◽  
Γ Ray ◽  
Ca:P Ratio

Longitudinal sections of human cortical bone were submitted to thermal neutrons. γ-ray spectra were recorded repeatedly during 15 days following irradiation. They showed that Na24 is predominant as early as 3 hours after activation and that all the γ-emitters have decayed on the 15th day. When the γ-rays have disappeared, ß-rays are still produced by the sections. It was proved by the absorption curve in aluminium that all these ß-rays are issued from the P32 induced in the sections by activation of P31. Therefore autoradiograms registered 15 days after activation reveal the distribution of P32 in the sections. γ-ray spectra and ß-ray absorption curves of neutron activated sections of ivory demonstrated a mineral composition similar to that of bone. Autoradiograms of ivory sections activated for various times were used to establish the relation between the optical density of the autoradiograms and the radioactivity in P32. When the bone autoradiograms are compared with the ivory standards of known radioactivity, the optical densities of single osteons (Haversian systems), can be related to their phosphorus contents. Autoradiograms and microradiograms of the same sections were examined side by side. The least calcified osteons, that contain 80 per cent of the calcium of the fully calcified osteons, also contain about 80 per cent of the phosphorus of the fully mineralized osteons. It is concluded that the Ca:P ratio remains constant while mineralization of bone tissue is being completed.

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