INSTITUTE FOR NUCLEAR RESEARCH PITESTI – ROMANIA

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INSTITUTE FOR NUCLEAR RESEARCH PITESTI – ROMANIA High Resolution Gamma Ray Spectrometry and Neutron Activation Analysis Laboratory http://www.scn.ro Dumitru BĂRBOS barbos@scn.ro Constantin PĂUNOIU

-Laboratory is included in the TRIGA Reactor department -Personel :drd. Constantin PĂUNOIU, drd.Dumitru BĂRBOS Irradiation facilities: a) TRIGA SSR 14MW Reactor b) TRIGA ACPR Reactor

TRIGA-ACPR REACTOR

CHARACTERISTICS The ACPR Reactor has two irradiation channels. The central tube ( Φ=304mm, h=228mm) and the pneumatic rabbit in D10 channel. In the stationary operation mode at 100KW in the central tube the thermal neutron flux is: Φth = 5*1011n/cm2*sec and the cadmium ratio for this location is: Rcd = 1.15 In the same operation conditions the unperturbed thermal neutron flux in the pneumatic rabbit channel is: Φth = 7.6*1011n/cm2*sec and the cadmium ratio is: Rcd = 1.78

The TRIGA SSR REACTOR 1 2 3 4 5 6 7 8 9 10 11 12 A B C D E F G H I J K L45 L39 L38 L2 H34 R-7 H3 H28 R-3 L44 R-2 H21 H26 H22 H30 L32 L46 L47 L49 H25 H12 H14 H18 R-1 L42 L40 R-4 H17 H6 A B C D E F G H I J K

CHARACTERISTICS The maximum thermal neutron flux available in one of the in core location, namely XC-1 water filled, is: Φth = 2.7*1014n/cm2*sec and the cadmium ratio is: Rcd = 3.08

f = Φth/ Φepi = 42.3 ( measured using Zr foil detector) The thermal flux in the beryllium holes for 10MW reactor power. Location: a)J7: Φth = 6.4*1013n/cm2*sec Rcd = 2.3 f = Φth/ Φepi = 15.2 (measured using Zr foil detector) b) K11: Φth = 9.54*1012n/cm2*sec Rcd = 4.15 f = Φth/ Φepi = 42.3 ( measured using Zr foil detector)

IRRADIATION DEVICES For ACPR Reactor: A pneumatic rabbit for TRIGA ACPR reactor. The dimensions of cartridge used in this pneumatic rabbit are : Φ14 h190mm. The pneumatic rabbit may be operated manually or automatically timed. SSR Reactor: For the beryllium channels, is available another pneumatic rabbit with cartridge dimensions of : Φ12 h=30mm. This pneumatic rabbit is manually operated. Another irradiation device, also of pneumatic rabbit type, is provided with an underwater storage rack having a capacity of 12 cartridges. It also has an automatic timing control.

GAMMA RAY SECTROMETERS AND SOFTWARE ANALYSIS PACKAGE Three high-resolution gamma ray spectrometers are available. All gamma ray detectors are HpGe type having relative efficiency of ~20% and V~100cmc. Two of the spectrometry chains are provided with an AQUSPEC multi-channel analyzer and GENIE2000 software analysis package.

NAA METHOD For NAA the method of multi-isotope foil standardization ( Zr method) was implemented. The method was checked through SRM samples irradiation ( basalt rock, code BE-N) and of a sample kit supplied by Reactor Experiments. Same samples were also measured through ICPMS. The samples are weighted by the means of METTLER TOLEDO AX205 scale. The QA system is also implemented in the current activities of the laboratory The laboratory accreditation process is undergoing.