ahmed mohamed maghraby - psau.edu.sa...ahmed mohamed maghraby 16-nov-14 recent techniques of...
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A Review BY:
Ahmed Mohamed Maghraby
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16-Nov-14 Recent Techniques of Radiation Dosimetry Using EPR - A Review by: Ahmed Maghraby (Ph.D.) 3
1-EPR discovery and History:
Stern-Gerlach experiment (1921).
Walter Gerlach
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16-Nov-14 Recent Techniques of Radiation Dosimetry Using EPR - A Review by: Ahmed Maghraby (Ph.D.) 4
Zavoisky, E., (1945).
Evgeny Konstantinovich Zavoisky
CuCl2.2H2O
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16-Nov-14 Recent Techniques of Radiation Dosimetry Using EPR - A Review by: Ahmed Maghraby (Ph.D.) 5
Frankel, J., et al., (1945).
Microwave systems following World War II.
Gordy, W., et al., (1955).
Van Roggen, A., et al., (1956).
Miyagawa, I., and Gordy, W., (1959).
Bradshaw, W., et al., (1962).
Brady et al, (1968).
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16-Nov-14 Recent Techniques of Radiation Dosimetry Using EPR - A Review by: Ahmed Maghraby (Ph.D.) 6
Theory:
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Fundamental Principle of EPR:
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16-Nov-14 Recent Techniques of Radiation Dosimetry Using EPR - A Review by: Ahmed Maghraby (Ph.D.) 8
Fundamental Principle of EPR:
E = g.B.H.M
∆E = h.υ= g.B.H g is Spectroscopic splitting factor: ge = 2.002319304386(20)
M : ½ or -½
B: Bohr magneton, (9.274x10-28 J G-1)
H is expressed in Tesla (T), mT, or gauss.
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E
B = 0
B ≠ 0
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Spectrometer Structure
1- Automatic frequency control.
2- Microwave source power supply.
3- Microwave source (Klystron or
Gunn diod. 4- Isolator. 5- Frequency
counter. 6- Attenuator. 7- Terminating
load. 8- Oscilloscope. 9- Detector
crystal. 10- 100 kHz signal amplifier.
11- 100 kHz signal detector. 12- Pen
recorder and data bank (or computer).
13- Circular or hybrid tee. 14- Cavity
system. 15- 100 kHz. Modulation coils.
16- 100 kHz. Power amplifier. 17-
100 khz. Oscillator. 18- Resonant
cavity. 19- Magnet power supply.
20- Field scan drive
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Field-Frequency Combinations
Waveband L S C X P K Q U V E W F D — J —
λ / mm 300 100 75 30 20 12.5 8.5 6 4.6 4 3.2 2.7 2.1 1.6 1.1 0.83
ν / GHz 1 3 4 10 15 24 35 50 65 75 95 111 140 190 285 360
H / T .03 0.1 .14 .33 .54 .86 1.25 1.8 2.3 2.7 3.5 3.9 4.9 6.8 10.2 12.8
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Field-Frequency Combinations
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Some Advantages of Radiation
Dosimetry using EPR
Non-destructive technique, hence archivable.
Small Sample size.
Accurate and reproducible.
Wide dose range, hence wide applications.
Possibility of quantification.
Rapid results accessible.
Measurements in wide range of temperatures.
Varieties of spectrometer design fits different applications.
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EPR Radiation Dosimetry
Industrial Applications Medical Applications Emergency
Alanine Food Irradiation Drug Irradiation Other Applications Other organics Human subjects Non-Human Subjects Environmental subjects
Teeth
Nails
Hair
Others
In-Vivo
In-Vitro
Meat
Vegetables
Fruits
Seeds
Oters (Tea, Spices, Herbs, …)
Alanine Dosimeters
Alanine derivatives
Structure
Shape
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EPR Radiation Dosimetry
1- Industrial Applications:
I- Food Irradiation.
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EPR Radiation
Dosimetry
1- Industrial Applications:
I- Food Irradiation.
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16-Nov-14 Recent Techniques of Radiation Dosimetry Using EPR - A Review by: Ahmed Maghraby (Ph.D.) 17
EPR spectra of irradiated crab exoskeleton:
a- Cheliped, b- dactyl, c- walking legs, d- carapace,
e-apron, f- swimming legs.
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1- Industrial Applications:
II- Drug Irradiation.
III- Other Applications.
EPR Radiation Dosimetry
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EPR Radiation Dosimetry
2- Medical Applications:
I- Alanine Dosimeters
(C3H7O2N)
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2- Medical Applications:
I- Alanine Dosimeters
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2- Medical Applications:
I- Alanine Dosimeters
Shape and Size
Structure
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2- Medical Applications:
I- Alanine Dosimeters
Standardization
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2- Medical Applications:
I- Alanine Dosimeters
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Advantages: 1. Nearly tissue equivalent over the radiation energy range above about 100
keV of photon energy.
2. Usefulness over a wide dose range 10-105 Gy.
3. Low fading in standard conditions.
4. Zero (or negligible) background.
5. Small sample size.
6. Reproducible.
7. Reasonable inter-batch uniformity.
Disadvantages: 1. Spectrum is attributed to not less than 3 radicals
2. Complex-time dependence.
3. Non-single peak spectrum.
4. Wide spectrum.
5. Limited sensitivity.
2- Medical Applications:
I- Alanine Dosimeters
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Alanine Derivatives.
Other Organics.
Inorganics.
EPR Radiation Dosimetry
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Retrospective and emergency dosimetry
Teeth Enamel Dosimetry
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Retrospective and emergency
dosimetry Teeth Enamel Dosimetry
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Retrospective and emergency
dosimetry
Teeth Enamel Dosimetry
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Emergency Dosimetry
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Emergency Dosimetry
Nails
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Hair
Teeth Biopsies
Non-Human Subjects
Environmental
Dosimetry
Emergency Dosimetry
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Hardware developments
Resonators
Bridges
Magnets
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Imaging
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Dating
Data Processing
Uncertainities
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T
H
A
N
K
Y
O
U