Экспериментальное исследование трансмутации некоторых радиоактивных отходов с использованием пучков релятивистских протонов

• Автор: Хелла Халед Мохамед Магди Ел-вафаей
• Шифр специальности: 01.04.16
• Научная степень: Кандидатская
• Год защиты: 2003
• Место защиты: Дубна
• Количество страниц: 88 с. : ил

JOINT INSTITUTE FOR NUCLEAR RESEARCH
HELLA KHALED MOHAMED MAGDY EL-WAFAEY
EXPERIMENTAL STUDY OF TRANSMUTATION OF SELECTED RADIOACTIVE WASTE USING THE BEAMS OF RELATIVIST1C PROTONS
Speciality: 01.04.16 - Physics of Atomic Nucleus and Elementary Particles
Thesis
for the degree of Candidate of Science In Physics and mathematics
DUBNA 2
CONTENTS
Chapter One “INTRODUCTION”
1-1 Introduction
1-2 The Composition ofNuclear Waste
1-3 The Various Management Methods for Spent Fuel
1-4 Experimental Production Rate (B-value)
1 -5 Spallation Neutrons
1-6 High Energy Particle Accelerators
1-7 Previous Investigations
1 -8 The Aim of the Present Work
Chapter Two “EXPERIMENTAL SET-UP”
2-1 Introduction
2-2 General Construction for Investigation of Spallation Neutron Flux and
Transmutation Studies at Experimental Set-up GAMMA-
Section A
2-3 Experimental Set-up GAMMA-2 with Different Targets
I-Lead Target
II-Uranium/Lead Target
2-4 Experimental Set-up GAMMA-2 For Monitoring System (Activation
foils)
2-5 Determination of the Neutron Distribution at Different Geometries,
Energies and Different Targets using Radiochemical Sensors
2-5-1 Determination of Neutron Distribution at the Surface of Paraffin Moderator
at Different Targets and Energies using Radiochemical Sensors
I- Natural Uranium Sensors
II- Lanthanum Sensors
2-5-2 Experimental Set-up for Determination of Radial Distribution for Spallation
Neutrons for Different Targets and Energies using Lanthanum Sensors
2-5-3 Experimental Set-up for Determination of Azimuthal Distribution of Spallation Neutrons for Different Targets and Energies using I39La Sensors
Section B
2-6 Experimental Set-up for Investigation of Neutrons Distribution as a Function of Moderator Thickness at Different Proton Energies using Radiochemical
Sensors
2-7 Experimental Set-up for Transmutation Samples
Section B
2-6 Experimental Set-up for Investigation of Neutrons Distribution as a Function of Moderator Thickness at different proton Energies using Radiochemical Sensors
During the last experiment in (Nov.2001), the relation between the thickness of paraffin moderator and experimental production rate (neutron yield) at different position was studied at different proton energies using GAMMA-2 setup with lead target. The Nuclotron accelerator was used to produce relativistic protons with energies 1.5, 1.0 and
0.65 GeV [H2],
Ten La sensors were installed at the upper part of paraffin moderator, the first five La samples Nos. (1, 2, 3, 4 and 5) were placed onto the surface of moderator (0 mm), with the distance 55, 106, 154, 205, 250 mm measured from the front plate of paraffin moderator. The other five samples Nos. (6, 7, 8, 9 and 10) were arranged in a straight line separated by 55 mm and divided into two groups, the first group consists of three La samples Nos. (6, 8 and 10), which was placed at about 10 mm depth, and the second group consists of two La samples Nos. (7 and 9) placed at about 20 mm depth inside the paraffin moderator. Fig. 2-8 shows vertical view of lead target including La sensors positions [H2],
Beam direction
La sensors

30 cm
Fig.2-8 Scheme of the experimental set up Gamma 2 with A1 monitors and La sensors at different depths inside the paraffin: sensor Nos.( I -5) at depth 0 mm, sensors Nos. (6, 8, 10) at depth 10 mm and sensors Nos. (7, 9) at depth 20 mm