Throughout the years, an optimizing counting conditions and optimum background region width determination has been carried out by several methods in gamma-ray spectroscopy. The effect of various widths focus on digital integration photopeak analysis. As application tool this nuclear physics, radioactive sources mostly used lower or higher resolution detectors; such as NaI(Tl) HPGe detectors. Th...

The standardization of Tl, using the 4π(PC)-NaI(Tl) coincidence system, is presented. The disintegration rate was determined by the extrapolation technique, using two methods: electronic discrimination and external absorbers. A Monte Carlo simulation program, developed in our laboratory, which predicts the behavior of the extrapolation curve, was applied and the results were compared with exper...

COSINE-100 is a dark matter detection experiment that uses NaI(Tl) crystal detectors operating at the Yangyang underground laboratory in Korea since September 2016. Its main goal to test annual modulation observed by DAMA/LIBRA with same target medium. Recently has released data an energy threshold lowered 1 keV, and persistent behavior still 9.5$\sigma$. By lowering for electron recoils result...

The thallium-doped sodium iodide [NaI(Tl)] scintillation detector is preferred as a gamma spectrometer in many fields because of its general advantages. A silicon photomultiplier (SiPM) has recently been developed and its application area has been expanded as an alternative to photomultiplier tubes (PMTs). It has merits such as a low operating voltage, compact size, cheap production cost, and m...

The performance of Radio-Isotope Identification (RIID) algorithms using NaIbased spectroscopy is increasingly important. For example, sensors at locations that screen for illicit nuclear material rely on isotope identification using NaI detectors to distinguish innocent nuisance alarms, arising from naturally occurring radioactive material, from alarms arising from threat isotopes. Recent data ...

This paper presents results of the development a small-sized free release monitor designed for materials, various hand tools, equipment and instruments nuclear enterprises laboratories staff that weight up to 50 kg, from radiation control. To increase registration sensitivity controlled radionuclides, 12 scintillation units based on 3"x3" sized NaI (Tl) crystal were used as gamma-radiation dete...

We have previously demonstrated the potential of multi-pinhole coded apertures when used in conjunction with compact pixelated detectors for high resolution, high sensitivity small animal SPECT. We are now constructing a prototype SPECT system with three such detectors mounted on a rotating gantry. Each detector comprises a 12 cm diameter circular array of NaI(Tl) crystals, each 1x1x5 mm3 on a ...

ANAIS (annual modulation with NaI scintillators) is a dark matter direct detection experiment consisting of 112.5 kg NaI(Tl) detectors in operation at the Canfranc Underground Laboratory (LSC), Spain, since August 2017. ANAIS’ goal to confirm or refute model independent way DAMA/LIBRA positive result: an annual low-energy rate having all features expected for signal induced by particles standar...

The ANAIS (Annual modulation with NaI(Tl) Scintillators) experiment aims at the confirmation or refutation of DAMA/LIBRA positive annual signal in low energy detection rate. ANAIS-112, consisting nine 12.5 kg modules, is taking data since August, 2017 Canfranc Underground Laboratory (LSC) Spain. Results from analysis three years are compatible absence modulation. background model developed for ...