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Development of X-ray Spectrometry for Nuclear Decay Data Applications at IFIN-HH

Development of X-ray Spectrometry for Nuclear Decay Data Applications at IFIN-HH . Aurelian Luca Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), Magurele, Romania.

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Development of X-ray Spectrometry for Nuclear Decay Data Applications at IFIN-HH

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  1. Development of X-ray Spectrometry for Nuclear Decay Data Applications at IFIN-HH Aurelian Luca Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), Magurele, Romania

  2. Work performed in the frame of the joint research project IFA Romania – CEA France no. C2-05/2012 (collaboration between IFIN-HH and CEA, DRT/LIST/LNHB, 2012-2015): “Creation of national standards for some emerging pharmaceutical radionuclides to ensure the radioprotection of patients and medical staffs”

  3. A new high-resolution spectrometry system is necessary at IFIN-HH for measurements of low energy γ- and X-rays emitted by the radionuclides to be studied for the project (177Lu, 186Re) and other applications. • The energy range (3…50) keV is of particular interest, as it cannot be covered by the existing high-resolution HPGe gamma-ray detector used in the Radionuclide Metrology Laboratory (RML) since 2007.

  4. The following components (Canberra) were purchased, assembled and preliminary tested: -Si(Li) detector (preamplifier included); -Digital spectrometer; -Notebook computer with GENIE2000 S511 and OriginPro v.9.0 (2012) software.

  5. Si(Li) detectorSL30170, with charge sensitive preamplifier model 2008B and cryostat model 7500: active diameter 6.2 mm, active area 30 mm2, 3 mm thick, 5 mm distance from the Be window (0.025 mm). High voltage: -500 V dc. Manufacturer specifications for a time constant 12 ms: FWHM=166 eV and FWTM=306 eV, for 5.9 keV (55Fe) • Digital spectrometer DSA 1000: DSP, MCA- 16384 channels, PHA/MCS, pole zero adjustment, pile-up rejector and dead time correction, pulse shaping, USB/RS-232, support for GENIE 2000 v.2.0A

  6. Experimental Results • Radioactive standard sources available: 55Fe [5.89 keV (25.02(30)%) XKaand(6.49…6.54) keV (3.40(7)%)XKb], T1/2=2.747(8) years 57Co [6.4 keV (50%), 7.1 keV (7%); g: 14.4 keV (9%)] 241Am [XL 12-22 keV (38%), g: 26.3 keV (2.4%) and 59.5 keV (36%)]. 55Fe point standard source: produced by RML; code SEG 7-872, activity: (3793±152) Bq, k=2 (27/02/2013); 7200 s measurement time; 50 mm distance above the detector

  7. Experimental Results -A spectral anomaly caused by a wrong electronic setup was corrected by the specialists from Canberra Romania (2013). After the correction: • Integral background counting rate (1022 channels): 0.234 counts/s • Experimental FWHM: 0.23 keV at 5.7 keV. • Detection efficiency for the mean energy (5.96 keV): 0.87·10-2s-1 Bq-1

  8. X-ray Spectra: 55Fe, 241Am 5.9 keV 6.5 keV

  9. Future Improvements • Resolving (deconvolution) complex X-ray and low energy g-rays spectral regions (e.g. 241Am) • Testing different types of sources to check the influence of self-absorption • Training for the use of GENIE 2000 software

  10. THANK YOU !

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