Dual Parameter Gamma-Ray Spectrometer for Low-Level Counting

A search for double-electron capture of 74Se to excited levels using coincidence/anticoincidence gamma-ray spectrometry

“…1). The vertical dipstick of the HPGe detector has been used in the shield design with the aim to allow for more versatile two parameter coincidence/anticoincidence γspectrometer with large cylindrical plastic scintillation detectors, also used as an anticompton shielding [30].…”

“…Several transition possibilities of the ECEC(0ν) decay of 74 Se to excited states were considered [28,30]. We shall focus in this work on double capture of L-electrons with transitions to the 2 + level of 74 Ge (1204.2 keV), accompanied by 595.8 keV and 608.4 keV de-excitation γ-quanta, or a 1204.2 keV de-excitation γquantum.…”

New ultra-sensitive radioanalytical technologies for new science

“…[ 47 ]; (v) beta-gamma-gamma coincidence mode (e.g. [ 47 ]; (vi) multidimensional gamma-spectrometer [ 47 , 52 , 53 ]; (vii) gamma–gamma spectrometer for measuring angular distribution of gamma-quanta. Coincidence gamma-spectrometers may decrease a background by about two orders of magnitude, what makes these spectrometers superior for very low-level gamma-spectrometry of positron or cascade gamma-emitters (e.g.…”

“…The recent developments in low-level radioanalytical techniques have helped to improve the detection limits using: (i) High efficiency Ge detectors (up to 200% of relative efficiency compared to 76 mm in diameter and 76 mm long NaI(Tl) crystal) operating in underground laboratories which represent the most important achievement in radiometric analysis of radionuclides [ 1 – 4 , 18 – 26 , 35 , 36 ]; (ii) Anticosmic shielding of detectors operating in surface and shallow-depth underground laboratories [ 39 – 42 ] which helped to improve detection limits comparable to deeper underground laboratories; (iii) Multidetector coincidence gamma-spectrometry systems for analysis of cascade and/or positron emitters [ 43 – 51 ]; (iv) Multidimensional gamma-spectrometry [ 52 , 53 ]. Thanks to excellent energy resolution of Ge detectors (< 2 keV for 1.33 MeV gamma-rays), and possibility to analyse various gamma-emitters in material and environmental samples selectively and very often non-destructively, they dominated in the field of ultra-low-level gamma-spectrometry [ 54 – 60 ].…”