Gamma ray bursts are some of the brightest events in the entire observable universe. Since the late 1960’s, thousands of gamma ray bursts have been observed and they have been researched extensively. However, there are still many mysteries which remain unsolved. One such mystery is whether or not the viewing...
The current model for gamma ray bursts (GRBs) assumes that internal shocks are responsible for the emission of gamma-rays. Internal shocks occur when the fast expanding shell collides with the slowly expanding shells. The light curve of a GRB depends on the initial state and the expanding speed of the...
A new method for delayed gamma-ray spectrometry to quantify the relative content of fissile material is developed and demonstrated to support international efforts in bolstering non-destructive assay capabilities. Previous traditional delayed gamma-ray spectrometry techniques rely upon nuclear data that often carry very high uncertainty. The new method removes the requirement...
An experiment has been conducted using a triple directional
correlation method developed by K. S. Krane, R. M. Steffen and R.
M. Wheeler (ref. 3). This method is presented and two normal detection geometries are introduced. The performance of the N1- and N2-
geometry was studied in four experiments using...
The purpose of this study was to develop a model to calculate
gamma ray pulse height distributions that closely approximate
measured ones. The model was used to produce a pulse height
distribution for a postaccident coolant sample from a nuclear
reactor. Lower limits of detection were calculated for certain key...