Transcript Development of X-ray Spectrometry for Nuclear

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
• 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”
• 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.
• 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.
• Si(Li) detector SL30170, 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, MCA16384 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
Experimental Results
• Radioactive standard sources available:
55Fe [5.89 keV (25.02(30)%) XK and (6.49…6.54) keV
a
(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
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):
0.87·10-2 s-1 Bq-1
X-ray Spectra: 55Fe, 241Am
5.9 keV
6.5 keV
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
THANK YOU !