Instrumental Neutron Activation Analysis...
Transcript of Instrumental Neutron Activation Analysis...
Frank Laboratory of Neutron Physics
Prepared by
Ayman Magdy El-Halwany
Supervisor :
prof. M. V. Frontasyeva
contents
1. Introduction
2. Objective
3. Methods
4. Treatment
5. Analysis
6. Result
Introduction Neutron Activation Analysis (NAA) is a sensitive
multi-element analytical technique used for both
qualitative and quantitative analysis of major, minor,
trace and rare elements
NAA was discovered in 1936 by G. Hevesy
(Hungary) and H. Levi (Denmark)
Forms of NAA
Destructive ( radiochemical ) - the resulting radioactive
sample is chemically decomposed, and the elements are
chemically separated
Nondestructive ( instrumental ) - the resulting
radioactive sample is kept intact
Applications of INAA at FLNP
Environmental studies (migration of pollutants in
ecosystems, air pollution studies using moss-biomonitors)
Biotechnology for medicine (development of new
pharmaceuticals and sorbents)
Material Science (high purity materials, nanoparticles
and objects of national heritage)
Principle
IBR-2 Pulsed Fast Reactor
Sample Rabbit
System
Reactor
Detector
Energy
Peak
analysis
Result
Sample preparation
Samples were prepared for irradiation at the chemical laboratory of the
FLNP according to the following procedure
1. Samples were cleaned of all external contamination
2. Small amounts of samples were put in a vial and then sealed.
3. The vial was put in a press, to pelletize the samples.
4. Each sample pellet was weighed to approximately 0.3 g dry-
weight and their masses were recorded.
5. For short-term irradiation; samples were heat-sealed in
polyethylene bags and for long-term irradiation; they were packed
in aluminium foil cups.
6. Samples were then taken to the reactor for irradiation.
Now
samples are
ready to the
“Irradiation”
Sample irradiated in reactor and then measured by gamma detector (HPGe)
Detection Irradiated samples are analyzed by gamma-spectrometry
Flow Chart for gamma‐ray Spectrometry
Spectrum analysis by Genie 2000
Calculate concentration by special program
Assessment of the environmental situation in the
the River Nile basin using nuclear and related
analytical techniques (2011-2015)
Sector of Neutron Activation Analysis and Applied Research
Division of Nuclear Physics, Frank Laboratory of Neutron Physics
Joint Institute for Nuclear Research
Project # 405
Sampling sites
Results of NAA of soil samples irradiated in radioanalytical complex REGATA at the reactor IBR-2 (elements determined based on short-lived isotopes), May 22, 2014
Na Al Ca Ti V Mn
Soil sample mg/kg % mg/kg % mg/kg % mg/kg % mg/kg % mg/kg %
i-01 5780 5 45500 5 46300 10 6500 10 108 5 1030 7
i-02 7650 5 86900 5 32700 10 11100 10 199 5 1370 7
i-03 6720 5 68900 5 33300 10 10100 10 172 5 1180 7
i-04 7760 5 62800 5 31700 10 9950 10 163 5 1310 7
i-05 2920 5 17300 5 5850 10 2290 10 26 5 320 7
i-06 6710 5 51400 5 31800 10 5190 10 277 5 373 7
i-07 7820 5 49700 5 24100 10 8060 10 136 5 883 7
i-08 3920 5 39400 5 9910 10 5240 10 84 5 577 7
i-09 3430 5 52000 5 11200 10 6400 10 96 5 691 7
i-10 2180 5 18000 5 7460 10 2330 10 34 5 269 7
i-11 2070 5 18100 5 9900 10 3040 10 38 5 323 7
i-12 8670 5 55700 5 19700 10 11300 10 162 5 618 7
i-13 3930 5 22700 5 8380 10 3690 10 42 5 298 7
i-14 5550 5 44300 5 21200 10 6890 10 108 5 893 7
i-15 7590 5 53500 5 22100 10 8640 10 139 5 745 7
i-16 5030 5 41900 5 24100 10 6680 10 106 5 805 7
i-17 5580 5 43500 5 21100 10 6930 10 108 5 689 7
i-18 6260 5 44900 5 19900 10 8140 10 109 5 688 7
i-19 6300 5 45400 5 27800 10 6890 10 110 5 710 7
i-20 6880 5 125000 5 51700 10 29000 10 839 5 921 7
i-21 3380 5 27100 5 9450 10 3920 10 56 5 431 7
i-22 5340 5 45300 5 17700 10 7100 10 104 5 644 7
Mean 5521 48150 22152 7699 146 717
Average soil,
Vinogradov6300 71300 13700 4600 100 850
R² = 0,8683
0
5000
10000
15000
20000
25000
30000
35000
0 20000 40000 60000 80000 100000 120000 140000
Al
Ti
References P. Bode: Instrumental and organizational aspects of a
neutron activation analysis laboratoty
http://www.sciner.com/Neutron/naa.html
http://reactor.engr.wisc.edu/naa/
http://tin.er.usgs.gov/geochem/doc/inaa.htm
http://reactor.engr.wisc.edu/naa/UWNRNAA.htm
http://www.reak.bme.hu/Wigner_Course/WignerManuals/
Budapest/NEUTRON_ACTIVATION_ANALYSIS.htm
http://archaeometry.missouri.edu/naa_overview.html
I would like to acknowledge Prof. M.V Frontasyeva
for her assistance, guidance and valuable advices
throughout this school..
Also, I want to express our deep thanks to our
Egyptian supervisors for their help, assistance and
their efforts in solving our problems .
I would also like to extend our regards to the
organizers of this Practice and all members of the
JINR involved in this school.
My first experience
at the reactor IBR-2
Thank you for your attention
спасибо