The Geiger Counter was essentially brain dead during this part of the run and also with a post Ba calibration on the low end... There were very few Gammas above 200 keV for this particular event (see the linear graph, for example... A more sensitive (to low energy X-ray/Gammas) donut Geiger tube will be employed. Yes, one can correlate a scintillator with a GMC by making the necessary adjustments, which will be done. We are also working on acquiring an additional scintillation crystal head/electronics for Coincidence/Veto and perhaps pointing it at the dummy side of the cell.
The detected radiation wasn’t shown to be sourced from the active cell. The Lead Cave opening for the scintillator was positioned on the active cell as opposed to the dummy side of the cell, but radiation from the dummy side could have made it into the scintillator, albeit at a reduced level, due to the lead bricks only partially obstructing it. External Radiation could also have entered the Scintillator opening, beyond the cell... Trace 7 spanned about a 4 hour period where the cell temperature was increased, dropped, then increased higher again and held there. Unfortunately, we don’t have much evidence where the semi-bursting occurred but we suspect it happened during the last leveling off at high temp, because we see remnants of it in the subsequent Trace #8. Since we had never raised the cell to such a high temp before this, we suspect there is a temperature correlation in regards to this radiation onset. Each time the temperature was increased to a new, higher level we suspect that radiation may have been emitted, but this is conjecture. There seems to be some threshold temperature, that’s about all we can say at this time ... We have plans for nailing this down in the next run, which most likely will be a pure replication attempt, but a better mouse trap to catch this mouse. - Mark Jurich From: Eric Walker Sent: Wednesday, February 24, 2016 7:52 PM To: vortex-l@eskimo.com Subject: Re: [Vo]:Re: Big surprise or big dud ? On Wed, Feb 24, 2016 at 12:45 PM, Mark Jurich <jur...@hotmail.com> wrote: Right now, we are working on beefing up the Geiger Counting Sensitivity, Coincidence Detection and obtaining another detector to confirm. It’s only one instrument, we need another to confirm. Temporary High Voltage Short??? ... Radon Gas Burst??? ... Cosmic Ray Anomaly??? ... ??? Since the photons in the NaI detector had energies up to 1500 keV, and the GM detector has a lower threshold of ~ 100 keV, it seems like it should be possible to obtain a strong correlation between the signals from the two detectors. One thing that I did not understand was how the detected photons in the NaI detector were shown to be sourced at the live tube. There was no evident correlation between the temperature of the active side and the photon signal. Eric
