EXPERIMENTAL DETECTION OF EXPERIMENTAL DETECTION OF EXPLOSIVES WITH A NSEC PULSED EXPLOSIVES WITH A NSEC PULSED

DD--T NEUTRON GENERATORT NEUTRON GENERATOR

Fast Neutron Research Facility,Department of Physics, Faculty of Science,

Chiang Mai University 50300, Thailand

S. SINGKARAT, U. TIPPAWAN, T. VILAITHONG

Chiang MaiChiang Mai

BangkokBangkok

Chiang MaiChiang Mai

Chiang MaiChiang Mai

Chiang Mai University (CMU)Chiang Mai University (CMU)

CMU

Fast Neutron Research Facility

F N RF

Chiang Mai University

Fast Neutron Research FacilityFast Neutron Research Facility

At FNRF we develop technologies for the At FNRF we develop technologies for the production and utilization of:production and utilization of:

Nano second pulsed neutronHeavy ionsFemto second electronHigh intensity coherent tera Hertz radiationLow temperature plasmas

Pulsed neutron generatorPulsed neutron generator

Role: nsec-pulsed neutron generatorManufacturer: Chiang Mai UniversityOperation period: Since 1991Utilization: - Nuclear reaction studies

- Explosive detection study

FemtoFemto SecondElectronSecondElectron Beam FacilityBeam Facility

Role: Femto second electron beam Manufacturer: Chiang Mai UniversityOperation period: 2005Utilization: - Production of Far Infrared Radiation

(wavelength = 50 - 1000 µm, bunch width ∼ 30 fs)- Femto second x-ray - Free Electron Laser - Biophysics studies (vibration of

DNA molecules, strand breaking of DNA

Ion Beam FacilityIon Beam Facility

Tandem accelerator Industrial ion implanter

Bioengineering ion implanter

Research ion implanter

ApplicationsApplications

Nano ion beam induced mutation in rice and cut flowers

Nano ion beam induced DNA transfer in bacteria

Ion beam induced nano structures in metals and alloys

Surface modifications of materials

Materials characterizations (RBS, PIXE, NRA)

PlasmaPlasma

Role: Plasma Immersion Ion Implantation (gaseous and metals)

Manufacturer: Chiang Mai UniversityOperation period: 2002

Untreated Treated Nano plasma processing of Thai silk

Utilization: - Nano plasma processing of Thai silk- Nano plasma processing of fuel cell components- Surface modifications of materials

FIG. 1. Total inelastic scattering cross-sections of neutrons populating various states of C, N,O.

ENDF/B-VI : (n,Inelastic)

FIG. 2. Schematic diagram of the pulsed beam linecomponents and their geometrical arrangements

(a) For a NaI(TI) detector

FIG 3. Experimental arrangement for the pulsed TOF prompt

gamma ray analysis

FIG 3. Experimental arrangement for the pulsed TOF prompt

gamma ray analysis

(b) For HPGe detector

FIG. 4 Block diagram of the electronic and two-parameter data acquisition systems

1 32

AMP 1

MCA

ADC 1

FAST AMP

CFD 1

TAC/SCA

TFA 1

CFD 2

GDG 1

SCA

GDG 2

TFA 2

CFD 3

TAC

ADC 2

AMP 2

DELAY AMP

ADC 3

MBS+MCA

FIG.6. Gamma ray spectra from liquid nitrogen, water and liquid paraffin. These spectra are used for peak identification.

FIG.7. Gamma ray spectra from TNT as recorded by the NaI (Tl) and HPGe detectors..

FIG.8. Time gated prompt gamma ray spectra from military explosives, M112(A), M2(B), TNT (C). The NH4NO3 spectrum is shown for comparison

FIG.9. Time gated gamma ray spectra of (a) luggage without C3 and (b) luggage with C3 explosive.

Channel Number100 200 300 400 500 600 700 800 900 1000

Cou

nts p

er C

hann

el

200

400

600

800

1000

1200

Luggage without C-3

Channel Number100 200 300 400 500 600 700 800 900 1000

Cou

nts p

er C

hann

el

200

400

600

800

1000

1200

Luggage with C-3

6.1

MeV

(O)

5.1

MeV

(N)

esca

pe

4.4

MeV

(C+N

)

2.3

MeV

(N)

3.7

MeV

(O)

2.8

MeV

(O)

esca

pe

1.6

MeV

(N)

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Chiang Mai Flower Festival3rd - 5th February 2006

April***Water April***Water FestivalFestival

November***November***LoiLoi KrathongKrathong FestivalFestival

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