Laborator de Analize prin Spectrometrie Gamma [GAMASPEC]

gamas@nipne.ro

Tel: 021.404.61.32 / Fax: 021.457.41.11

Cuvinte cheie: spectrometrie gamma, analiza radionuclizi, radioactivitate naturala, analiza elemente chimice prin activare cu neutroni

  • Notificat CNCAN
    26-07-2016

    Notificare Nr. IFIN-HH_GamaSpec LI 03/2016
    Descarca fisier

  • Laboratorul GamaSpec functioneaza in conformitate cu Notificarea Comisiei Nationale pentru Controlul Activitatilor Nucleare (CNCAN) nr. Ll 03/2013, in acord cu standardele de calitate SR EN ISO 9000 si SR EN ISO/CEI 17025.

    Domeniu de activitate

    • Incercari pentru analiza radioactivitatii in probe de mediu, materiale si probe provenite de la dezafectarea reactorului VVR-S, prin spectrometrie gama de fond scazut.
    • Incercari pentru analiza concentratiilor elementale in probe de mediu si materiale prin metoda de analiza prin activare cu neutroni (iradierea cu neutroni se realizeaza la reactorul nuclear TRIGA al RATEN-ICN Pitesti).

    Aparatura utilizata

    Sistem spectrometric gama de inalta rezolutie, cu detector tip HPGe Ortec (eficacitate relativa de detectie de 30%, rezolutie energetica de 2,3 keV la energia de 1332 keV a 60Co).
    Pentru a reduce fondul natural din spectrul gama al probei, detectorul este plasat intr-un ecran de Pb (10 cm grosime) captusit cu folii de Sn (1 mm) si Cu (1,5 mm).
    Rata de numarare a impulsurilor electrice in spectrul fondului natural (domeniu de energie 20 - 2800 keV, timp de masura 24 h) este de 1,2-1,7 impulsuri/secunda.

    Performante analitice

    1. Radionuclizi investigati in probe de mediu prin spectrometrie gama
    • Radionuclizi artificiali: 137Cs, 60Co, 241Am, etc.
    • Radionuclizi naturali: produsi de dezintegrare din seriile radioactive 238U-226Ra si 232Th; 235U; 40K; 7Be.
    Masa proba: ~ 10 - 200 g (probe solide);
    Volum proba: 100 ml - 1 l (probe lichide).

    2. Elemente investigate in probe de mediu prin metoda de analiza prin activare cu neutroni instrumentala (fara prelucari chimice ale probelor): Ag, As, Au, Ba, Br, Ca, Cd, Ce, Co, Cr, Cs, Eu, Fe, Hf, Hg, K, La, Lu, Mo, Na, Nd, Ni, Rb, Sb, Sc, Se, Sm, Sr, Tb, Th, U, W, Yb, Zn.
    Masa proba: ~ 10 - 150 mg (probe solide).
    Nota: analiza prin activare cu neutroni se poate efectua corelat cu perioadele de functionare ale reactorului nuclear TRIGA al ICN Pitesti.

    Activitate minima detectabila (AMD) in masurarea radioactivitatii

    0,090 Bq137Cs, in apa de volum 1 l (geometrie Marinelli);
    0,072 Bq 137Cs, in apa de volum 150 cm3 (geometrie cilindrica tip Sarpagan).

    Limite de detectie in analiza prin activare cu neutroni:

    0,1 μg/kg (0,1 ppb) - 10 g/kg (1 %), in functie de tipul elementului si matricea probei.

    Descrierea metodei

    Spectrometria gama este o tehnica nucleara utilizata pentru determinarea radionuclizilor emitatori de radiatii gama, prezenti in diferite tipuri de probe.
    Etape analitice:
    • identificarea radionuclizilor (analiza calitativa);
    • determinarea activitatii/concentratiei de activitate a radionuclizilor identificati, exprimata in Bq, respectiv Bq/kg sau Bq/l (analiza cantitativa).

    Analiza radioactivitatii naturale in probe de mediu prin spectrometrie gama de fond scazut

    Spectrul gama al fondului natural din laborator se datoreaza in principal radionuclizilor din seriile radioactive uraniu-radiu (238U-226Ra) si toriu (232Th), precum si radionuclidului 40K.
    Variatiile temporale aleatorii ale radonului in spectrul fondului natural din laborator impun masurarea alternativa a probei si a fondului, in special in cazul probelor cu nivel scazut al radioactivitatii naturale. Durata de masura, pentru probe si fondul natural, este de aprox. 24 ore.
    Pentru analiza 226Ra, probele se inchid etans si se masoara dupa 3-4 saptamani, pentru a se realiza echilibrul radioactiv intre 226Ra si descendentul sau gazos 222Rn (radon). Prin spectrometrie gama se masoara radionuclizii 214Pb si 214Bi, descendenti ai radonului.
    Concentratiile elementelor U, Th si K in probe se pot determina prin masurarea radioactivitatii 238U, 232Th si 40K.

    Analiza prin activare cu neutroni

    Analiza prin activare cu neutroni (NAA) este o tehnica analitica multielementala, bazata pe producerea in proba, prin reactii nucleare de activare cu neutroni a unor radionuclizi emitatori de radiatii gama. Activitatea radionuclizilor produsi este direct proportionala cu numarul de nuclee pe care a avut loc reactia, asadar cu masa/concentratia elementelor activate in proba. Analiza prin activare cu neutroni instrumentala (INAA) se realizeaza fara prelucari chimice ale probelor inainte sau dupa iradiere (metoda nedistructiva). Laboratorul GamaSpec poate determina prin metoda INAA elemente ce produc prin activare cu neutroni radionuclizi cu T 1/2 >= 12 h, prin iradiere cu neutroni la reactorul TRIGA al RATEN-ICN Pitesti.

    Controlul calitatii se realizeaza prin:

    • utilizarea de materiale de referinta certificate;
    • participarea periodica la teste de capabilitate si exercitii de intercomparare, organizate la nivel international de Agentia Internationala pentru Energie Atomica (IAEA) Viena, IAEA-MEL Monaco, Institutul de Chimie si Tehnologie Nucleara (INCT), Varsovia, Polonia;
    • participarea la exercitii de comparare interlaboratoare organizate in IFIN-HH.

    Clienti / Potentiali clienti

    • Intreprinderi producatoare de fertilizatori fosfatici, materiale de constructie, energie electrica (termocentrale pe baza de carbune si centrale electrice nucleare), zgura metalurgica.
    • Agentii de Protectie a Mediului.

  • Soil pollution with trace elements at selected sites in Romania studied by instrumental neutron activation analysis

    Ana Pantelica, Maria do Carmo Freitas, Antoaneta Ene, Eiliv Steinnes

    Radiochimica Acta 101 (1) (2013) 45-50

    Instrumental neutron activation analysis of some fish species from Danube River in Romania

    Ana Pantelica, Antoaneta Ene, Iulia I. Georgescu

    Microchemical Journal 103 (2012) 142-147

    Thirty-year experience in applying neutron activation for analysis of mineral and biological samples from the Romanian sector of the Danube River and the Black Sea

    A.I. Pantelica, M.N. Salagean, I.I. Georgescu

    3rd Black Sea Basin Conference on Analytical Chemistry (3rd BBCAC), 12th - 14th of September, 2005, Constanta, Romania, Ovidius University Annals of Chemistry, 16, 1 (2005) 89-96

    Contamination of crop vegetation with trace elements from a fertilizer plant: An INAA study

    A. Pantelica, C. Oprea, M.V. Frontasyeva, I.I. Georgescu, E. Pincovschi, L. Catana

    J. Radioanal. and Nucl. Chem. 262 (1) (2004) 111-118

    INAA and chemical analysis of water and sediments sampled in 1996 from the Romanian sector of the Danube river

    A.I. Pantelica, I.I. Georgescu, M.H.I. Oprica, C.M. Borcia

    Czechoslovak Journal of Physics, 49 (S1) (1999) 331-337

    Comparative evaluation of some pollutants in the airborne particulate matter in Eastern and Western Europe: two-city study, Bucharest-Stuttgart

    V. Cercasov, A. Pantelica, M. Salagean, H. Schreiber

    Environmental Pollution,101 (3) (1998) 331-337

    Application of INAA and XRFA in a comparative environmental study

    V. Cercasov, A. Pantelica, M. Salagean, H. Schreiber

    J. Radioanal. Nucl. Chem. 204 (1) 173-181 (1996)

    INAA of some phosphates used in fertilizer industries

    A. Pantelica, M. Salagean,I. I. Georgescu, E. Pincovschi

    J. Radioanal. Nucl. Chem., 216 (2) (1997) 261-264

    Characterization of metallurgical slags using low-level gamma-ray spectrometry and neutron activation analysis

    Antoaneta Ene, Ana Pantelica

    Rom. Journ. Phys. 56 (7-8) (2011) 1011-1018

    Natural and artificial radioactivity in soils from Romanian sites determined by gamma-ray spectrometry

    A. Pantelica, I.I. Georgescu, E. Pincovschi

    16th Radiochemical Conference, April 18-23, 2010, Marianske Lazne, Czech Republic

    Radioactivity levels of soil and vegetation around phosphogypsum stacks in Romania

    A. Pantelica and E. Botezatu

    International Symposium on In Situ Nuclear Metrology as a Tool for Radioecology (INSINUME 2010), 20-23 October 2010 in Dubna, Russia

    Investigation by gamma-ray spectrometry and INAA of the radioactivity impact on phosphate fertilizer plant environment

    A. Pantelica, I.I. Georgescu, E. Pincovschi, I. Companis, C.R. Badita

    International Symposium In Situ Nuclear Metrology as a Tool for Radioecology (INSINUME2006), 6-9 Sept., 2006, Kusadasi, Turkey

    Thorium determination in intercomparison samples and in some Romanian building materials by gamma-ray spectrometry

    A. Pantelica, I.I. Georgescu, M.D. Murariu-Magureanu, I. Margaritescu and E. Cincu

    Radiation Protection Dosimetry 97 (2) (2001) 187-192

    On the chemical and radioactive content of the Danube river samples collected in February-March 2000

    I.I. Georgescu, Gh. D. Baran, D. T. Breban, V. Cojocaru, M. Ciubotariu, A. Danis, A.I. Pantelica, V. Gh. Stanescu

    The 36th CIESM Congress, Monte Carlo, 24-28 Sept. 2001; Rapp. Comm. Int. Mer Medit., 36 (2001) 128

    Artificial radioactivity in environmental samples as IAEA reference materials

    M. Salagean, A. Pantelica

    Proceedings Supplement of the Balkan Physics Letters, 5 (1997) 2190-2193

    On the radioactivity of water and sediments from the Danube River significant cross sections during Autumn 1998

    I.I. Georgescu, Gh. D. Baran, A.I. Pantelica, M.N. Salagean, A.G. Scarlat

    Proceedings of the 5th International Conference on Nuclear and Radiochemistry (NR5), Pontresina, Switzerland, 2000, 477- 479

    Radioactivity of bottom sediments sampled in 1996 from the Romanian sector of the Danube river

    A.I. Pantelica, I.I. Georgescu

    The 35th CIESM (Commission Internationale pour l'exploration scientifique de la Mer Mediterranee) Congress, Dubrovnik, Croatia, 1-5 June, 1998 ; Rapp. Comm. int. Mer Medit., 35 (1998) 282-283

    137Cs Concentration in Bed load sediments sampled from the Danube River and the Black Sea during 1993

    I.I. Georgescu, G. Baran, A. Pantelica, M. Salagean

    Rapp. Comm. int. Mer Medit., 34 (1995) 228

Ultima actualizare: 01.09.2015