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 Incoming gamma radiation 
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Joined: Sat Feb 01, 2014 3:46 pm
Posts: 47
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gamma spikes 2014-2016.png
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Daily averaged gamma data from late 2013 to present.


Fri Jun 24, 2016 6:30 am
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Joined: Sat Feb 01, 2014 3:46 pm
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BOXTEST.JPG
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Here is the result of the open lead box test. The trace for the pancake tube is on top.


Fri Jun 24, 2016 8:03 am
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Joined: Fri Jul 03, 2015 7:04 pm
Posts: 147
Location: Toronto Canada
Assuming the top trace is a 24 hour period, it's hard to see a clear pattern matching a satellite. An orbiting source like this should cause from 1 to 3 spikes for 3 minutes every 111 minutes, as the satellite passes overhead N-S or S-N. This pattern should repeat every 12 hours as the earth turns (N-S, then S-N). There seems to be a general rise for the last 4 hours of this period, but there also seems to be some spikes at maybe 2 hour intervals. Do any of the spikes match the SNAPSHOT satellite orbit over your detector? [Right now, the N2YO site is not able to track this satellite, but it can track other satellites - odd].

More shielded detectors would help test this idea. Where did you get your lead box? I might try to set one up.

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http://netc.com/chart/view.php?n=1%3A77D9CCCA.5 Toronto, Ontario, Canada SBM-20 indoors


Fri Jun 24, 2016 2:52 pm
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Joined: Sat Feb 01, 2014 3:46 pm
Posts: 47
http://www.nuclead.com/

6 bought 6 sheets of 1/4 inch thick 5x7 inch and glued them together with hot melt glue so that i could configure them and make changes.
The test was not useful since it was so short.
setting it up for a longer session, but have to be careful it doesn't get rained on or attacked by constipated birds.


Sat Jun 25, 2016 6:53 am
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Joined: Fri Jul 03, 2015 7:04 pm
Posts: 147
Location: Toronto Canada
The N2YO site is tracking SNAPSHOT again, and the 10 day predictions now show fewer passes overhead than I saw there 3 days ago. It's one pass every 12 hours or so, with some days of no visibility to a shielded detector. 3 days ago I thought I saw consecutive 'excellent' and 'good' orbits over my location shown by orange and dark yellow rows adjacent to each other. Now there is only 1, so maybe I read it wrong. I also realized that the site is rating the visibility, so does not show the daytime passes on the default 'visible' table; you have to select 'all passes' and then click the 'map and details' link for each entry to see how close overhead it will be.

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http://netc.com/chart/view.php?n=1%3A77D9CCCA.5 Toronto, Ontario, Canada SBM-20 indoors


Sat Jun 25, 2016 11:38 am
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Joined: Sat Feb 01, 2014 3:46 pm
Posts: 47
I checked in there and yep...you are ready to roll...If you look at some of the NETC charts for 2 years daily average...you will see the SNAPSHOT pattern shifted left to right somewhat for each sites location. Digitizing this data from the charts is doable but such a pain. Can NETC folks help out?


Sat Jun 25, 2016 2:12 pm
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jun25 flyby 1AM.png
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upper trace 7311 Sat Jun 25 10:21:00 2016 to Sun Jun 26 07:31:00 2016

EDT facing east up
flyby peak elevation azim expected 714 expected 7311
25-Jun 23:21 24° 72° yes no
26-Jun 01:12 68° 270° yes yes
26-Jun 03:04 11° 289° weak no

26-Jun 10:58 16° 73° yes no
26-Jun 12:51 89° 64° yes yes
26-Jun 14:41 17° 293° weak no
26-Jun 23:31 29° 74° yes weak


Is there a bb code for tabs?


Sun Jun 26, 2016 7:31 am
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Joined: Sat Feb 01, 2014 3:46 pm
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predictor.png
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Taking the above experiment to the next level ( after some problems with the sun overheating the processor)

The yellow dots are the predicted passages for my coordinates (from the list in the previous post and more.)
The upper trace is the pancake GM tube in the open lead box, and the lower trace is the Gamma tube in the window frame facing East at the level of our horizon. (a ridge of hills).
The yellow dots are calculated from the elevation angle divided by 90. So the tracks that will pass most directly overhead the box will be on the top of the screen.
Allowing for a storm approaching tomorrow, I will try to keep it running for as long as it takes to get a good correlation. I am expecting the satellite body to not be emitting gamma if the core was ejected.
The core material (also known as "corium" by some folks) may be in several pieces and our goal is to assign identification signatures to each so they can be matched up with those already identified by radar.


Sun Jun 26, 2016 6:58 pm
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Joined: Fri Jul 03, 2015 7:04 pm
Posts: 147
Location: Toronto Canada
I think you are on the right track. Can your 7311 detector log values every minute and with time stamps? Netc graphs show 10 minute averages minimum, so it is harder to see the 3 minute rise for each orbit (it would usually influence one data point in a 12 hour period, assuming consecutive nearby orbits). With one minute readings, there should be 3 consecutive higher readings during the 2 orbits on June 26 that are over 68° elevation.

I could not find a reference to the SNAP-10A satellite core being ejected, but a reference to ejecting the reflectors (shutting down the reactor), and a later "shedding" or "releasing" of 50 pieces of traceable debris. These terms imply the pieces are in more or less the same orbit as the main piece, not knocked away by an impact or explosion. If the reactor was among the "shed" pieces and is emitting Gamma radiation, it should still follow the pattern, but at some unknown distance away from the main piece. If it has become a trail or cloud of radioactive debris, it will be harder to see with this setup.

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http://netc.com/chart/view.php?n=1%3A77D9CCCA.5 Toronto, Ontario, Canada SBM-20 indoors


Sun Jun 26, 2016 9:21 pm
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Joined: Fri Jul 03, 2015 7:04 pm
Posts: 147
Location: Toronto Canada
I forgot to provide a link to the SNAP-01A reference (this is the Wikipedia reference):
http://ston.jsc.nasa.gov/collections/trs/_techrep/TP-1999-208856.pdf

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http://netc.com/chart/view.php?n=1%3A77D9CCCA.5 Toronto, Ontario, Canada SBM-20 indoors


Sun Jun 26, 2016 11:18 pm
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