Measurement of talc in flour by the prompt-gamma ray neutron activation analysis method.

Prompt gamma-ray neutron activation analysis method (PGNAA) was used to measure the talc content in flour. Neutron activation prompt gamma spectrum measured by NaI(Tl) detector has complex components, poor energy resolution, and high Compton plateau, how to obtain accurate element content from the prompt γ spectrum is one of the core problems of PGNAA. To reduce the systematic uncertainty caused by the variation of the neutron energy spectrum and γ self-absorption in different samples, the spectral decomposition method based on library least-squares was improved.

Neutron and Photon Dose Rates in a D-T Neutron Generator Facility: MCNP Simulations and Experiments.

The deuterium-tritium neutron generator is a common neutron source for fast neutron activation analysis. The 14.1 MeV neutrons emitted from a deuterium-tritium neutron generator are difficult to shield due to their strong penetrability and the induced secondary gamma rays in the shield.

Measurement of neutron yield and angular distribution for D-T neutron generator by neutron activation analysis method.

To measure the neutron yield of D-T neutron generator, the activation foils of iron, copper and aluminum were used to be irradiated in the neutron field. The 14.1 MeV neutron yield was deduced by counting the characteristic γ-rays of radioisotopes produced by five nuclear reactions [Fe(n,p)Mn, Cu(n,2n)Cu, Cu(n,2n)Cu, Al(n,α)Na, Al(n,p)Mg].

The generation mechanism of spike-and-slow wave discharges appearing on thalamic relay nuclei.

In this paper, we use a model modified from classic corticothalamic network(CT) to explore the mechanism of absence seizures appearing on specific relay nuclei (SRN) of the thalamus. It is found that typical seizure states appear on SRN through tuning several critical connection strengths in the model. In view of previous experimental and theoretical works which were mainly on epilepsy seizure phenomena appearing on excitatory pyramidal neurons (EPN) of the cortex, this is a novel model to consider the seizure observed on thalamus.

Controlling mechanism of absence seizures by deep brain stimulus applied on subthalamic nucleus.

Based on a classical model of the basal ganglia thalamocortical network, in this paper, we employed a type of the deep brain stimulus voltage on the subthalamic nucleus to study the control mechanism of absence epilepsy seizures. We found that the seizure can be well controlled by turning the period and the duration of current stimulation into suitable ranges. It is the very interesting bidirectional periodic adjustment phenomenon.