Neutron detection with a NaI spectrometer using high-energy photons

RETRACTED: Neutron detection by large NaI crystal

“…One alternative approach for neutron detection is to use high-energy gamma-rays (energies higher than 3 MeV) produced in (n,γ) and ðn; n 0 γÞ reactions [2,3]. In this paper, we discuss the expected γ-ray spectra when a cylindrical NaI crystal 4 in.…”

Sensitive neutron detection method using delayed coincidence transitions in existing iodine-containing detectors

“…Neutrons have previously been detected by these scintillation devices through various approaches (see Table 1). It is important to note that, in [4], when a NaI spectrometer was compared to a 3 He-based portal monitor with a comparable active volume, the detection efficiencies and minimum detectable activities of the devices were found to be similar.…”

“…Neutrons Short description [3] NaI thermal boron lining with available NaI detectors [4] NaI thermal high-energy photons following (n,γ) reactions in the NaI [5,6] NaI(Tl) thermal triple β−γ−γ coincidences in two detectors following (n,γ) reactions on 23 Na [7] NaI thermal activated NaI detector ( 128 I β−decay, T 1/2 = 25 min and 24 Na β−decay, T 1/2 = 15 h) [8] CsI(Na) fast 57.6 keV signal from 127 I(n,n ′ ) inelastic scattering [9] NaI(Tl), CsI(Tl) fast 1-200 MeV neutrons, (n,p) and (n,α) reactions, pulse-shape discrimination…”

Novel Coincidence Techniques, Detectors and Concepts for Safety, Security and Safeguards

“…PVC and polyethylene slabs were 2 cm thick. This kind of converter/moderator structure more than doubles the high energy signal [1]. A 10 cm thick sandwich converter/moderator was chosen as a compromise between the performance and size.…”

“…Cross-sectional areas of the detectors were comparable but the active volume of the NaI detector was larger by approximately a factor of three. Measurements with both bare and shielded 252 Cf and AmBe sources are reported in [1]. It is noteworthy in these studies that the 3 He tube has a higher detection efficiency compared to the NaI detector only when measuring unshielded 252 Cf source.…”