Research at the cold neutronbeam facilities of the Intitute 在的研究所的冷中子束设施的的研究

1、institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011research at the cold neutron-beam facilities ofthe institute of isotopest. belgyadepartment of nuclear researchinstitute of isotopes hungarian academy of sciencesh-1525 pob 77, budapest, hungarynupecc meet

2、ing, kfki rmki, budapest, hungary, 07 october 20111institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 20112content motivations experimental facility pgaa research fields highlight summaryinstitute of isotopes has, dept. of nuclear research nupecc meeting, kfki

3、 rmki, 07 october 20113institute of isotopes has number of employee: 90 number of scientists: 40 annual budget: 2.3 meur number of refereed journals/year: 70 number of citations/year: 1200 dnr number of scientists: 8 scientists drs (dept. of radiation safety): 15 scientists safeguard, dosimetry, ill

4、icit trafficking, nuclear inventoryinstitute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 20114motivationscold neutron beam(n,g) reactionpgaa applicationsimagingnuclear datanuclear physicsinstitute of isotopes has, dept. of nuclear research nupecc meeting, kfki rm

5、ki, 07 october 20115the pgaa-nips facilities at budapest rrinstitute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 20116pgaa-nips facilitiesl. szentmiklsi, t. belgya, zs. rvay, z. kis, j. radioanal. nucl. chem. 286:501-505 (2010)n-beaminstitute of isotopes has, dep

6、t. of nuclear research nupecc meeting, kfki rmki, 07 october 20117pgaa-nips facilities a member of the budapest neutron centre (bnc) operated as a user facilitynmi3 - integrated infrastructure initiative for neutron scattering and muon spectroscopycharisma eu fp7 (rosta & kasztovszky next talk)e

7、rinda euratom fp7institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011the prompt gamma neutron activation analysis(principles of pgnaa)the gamma energy is characteristic for the element or isotopethe gamma-ray intensity is characteristic for the quantity of

8、the element or isotopepgaa is a radiative neutron-capture based analytical technique8institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011main features of prompt gamma neutron activation analysisnuclear analytical methodsample irradiated with neutronsenergy

9、elementintensity quantitynondestructive multi-elemental, multi-isotopic minimal sample preparation average composition of the irradiated volume exact for homogeneous samples negligible residual activity fast, instant result no external standard is necessary (library needed) good for major, minor com

10、ponents and some traces, unique for h, b great variety in elemental sensitivities, detection limits no chemical composition molnr, g. l., ed. (2004). handbook of prompt gamma activation analysis with neutron beams. budapest, kluwer academic publisher dordrecht, boston, london9institute of isotopes h

11、as, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011determination of chemical compositionm : mass of the elements : sensitivityag : peak areana : avogadro-numberm : molar weight : isotopic abundance0 : neutron capture cross-sectionpg : gamma-yieldf0 : neutron flux(eg) : detector

12、efficiency)()(;0ggggfgefepmnstsmaa fit from g-spectrumfrom our measuredpgaa library10tsamginstitute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011summary of activitiespgaa(n,g g) reactionscross sectionsnuclear physicsresearch xsections for ads & gen-iv llff

13、 99tc, 129i (fzj, irmm) fuel 238,235u,232th (iaea, irmm) structural mat.209bi, 204,206,207pb (irmm) nuclear astrophysics22ne, fe, ni (fzk, cern)methodology internal comparator chopped beamresearch archaeology (iaea, charisma) geology (elte) catalyst (fh inst.) material sciences (kfki) safeguard (oah

14、) n. waste (fz jlich) pgai/nt (nmi3 jra, iaea)methodology pgaa library (iaea, lbl) chopped beam pgaa standards (iaea)researchdecay schemes204,206,207pb (irmm) 99tc, 101ru (ill)fe, k, pd (lbnl)strength functions 57fe (oslo, frank l.)78se, 196pt, 114cd (fzd, efnudat)methodology(n,g), (n,gg), (g,g)mont

15、e carlo11institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011highlight12pgai/ntneutron tomography driven prompt gamma activation imagingnondistructive measurement of elemental distribution in samplesancient charm eu fp6 nest project (2005-2009)institute of

16、isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011first elemental imaging experiments on a combined pgai and nt setup of dnr at the budapest research reactoraluminumironcoppersymmetry axisthe sample pgai/nt sample and grid scanning choice: a simple known object in ord

17、er to understand the main features of the experiments grid scanning6li-polydetectorgridlead collimatorn-beamntisovolume13institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011pgai-nt setup and calibration objectsimple benchmark sampleand shieldingfe rod 1.9 m

18、m cu rod 1.6 mmal cylinder 12 mm belgya, t., z. kis, et al. (2008). a new pgai-nt setup at the nips facility of the budapest research reactor. j. nucl. radioanal. chem. 278(3): 713-718pgai/nt setup of dnr14institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 201

19、1neutron collimator and the simple benchmark sample15institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011monte carlo simulation of the experimental results 16kis, z., t. belgya, et al. monte carlo simulations towards semi-quantitative prompt gamma activatio

20、n imaging nucl. instr. and methods a 638(1): 143-146.institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011neutron tomograph slice and 3d view of the sample 17institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011the s

21、elected object for 3d imaging studies and the replicadisc fibula with almadine inlays imported in to the territory of the avar empire from the frankish settlement area. the main iron structure with silver or guilded silver is very rare. origin: kled 2nd half of 6th c. ad, grave a 279;76.1.45this obj

22、ect is the logo of ancient charm projectzs. kasztovszky and t. belgya, archeometriai mhely 2006/1, 12-1718institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011our 3d pgai experiments at frm-ii(high flux)pgaa setup at frm-ii, garching, germanybeam parameters:

23、mean neutron spectrum energy 1.83 mevmean neutron wavelength 6.7 thermal equivalent neutron flux2.421010 n/cm2/s (no nose)5.51010 n/cm2/s (with nose)usable beam size: (14x38) mm (no nose)(4x10) mm (with nose)19institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october

24、 2011pgaa setup at frm-ii20institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011nt of fibula at frm-ii in collaboration21institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011pgai measurements on the fibula in collabo

25、ration(grid scanning)fesaucu22institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011pgai measurements on the fibula in collaboration continuedhalagcl23institute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011safeguard dev

26、elopment at dnrrotated samples in lead container with tomographand pgai-nt at the cold beam of brrnatural uranium oxide (u2o3) fe screw aluminum cylinder copper balls pb container click on this24szentmiklsi, z. kis, t. belgya, z. kasztovszky, p. kudejova, t. materna, r. schulze, a new pgai-nt setup

27、and elemental imaging experiments at the budapest research reactor, nrc7 - seventh international conference on nuclear and radiochemistry, budapest, hungary 24-29 august 2008, (2008) pp. 1-4.n-beam directioninstitute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 20

28、11corrections by monte carlo calculationsfor quantitative analysisgeometry or voxel modelmcnp5 mesh tally simulations for neutron and gamma transport1.local neutron flux2.neutron transmission: radiography3.(n,g) reaction rates4.detection efficiency of emitted gammasneutron source overlaid on the geo

29、metryndimensions and positions from the radiographies, nmaterials from the gamma spectranproperties of the setup and the beam must be knowninstitute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011(n,g) reaction rates z: beam directionelemental spectra measured o

30、n the objects in the container by pgai/nt experimentsoverlay of calculated n-beam absorption in the objectsinstitute of isotopes has, dept. of nuclear research nupecc meeting, kfki rmki, 07 october 2011future: a new setup for pgai-nr at budapest: normadesign is ready, expected to be completed in q4 2011(depends on the availability of