My inbox has filled up with questions about a video that appeared on youtube this past evening after the storm blew through:
Simply put, before you read all the thanks and details.. it seems that potrblog might have gotten an unintended false high reading due to the metal he was wiping on , or the other material in the grit on the metal.
The actual precipitation is only returning moderate amounts of radiation (less than half of alert levels).
It is important to use something that is clean, and only shows the precipitation.. others must try to avoid any other particulates contaminating the samples .
I have seen several false high readings appear on youtube coming from windshields (brake pad dust is ceramic and returns false high readings for instance).. or people doing a test near large rocks like Granite .. or even people using ceramic plates to hold their measurements (ceramic produces a non-harmful high radioactive return).
It may just be that the grit on the metal and possibly the metal itself would throw off his reading. Grit/sand could easily be made up of granite -- producing a false high. Metal can produce high readings after it has oxidized.
One must collect the water in a clean plastic or glass container.. and do the test using clean tissue --- prefer to have the tissue dipped and then dry or just partially damp.. since the H20 itself can block alpha particles .
The point of these tests is to determine how much radiation is in the PRECIPITATION -- which means one should NOT introduce other particulate matter into the test .
Here is the video in question from http://www.youtube.com/potrblog --- showing VERY high returns in Saint Louis (STL) Missouri :http://www.youtube.com/watch?v=LRgpiD4TpAU
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Tonight, 10/18/2012 at 1050pm CDT -- Using a basic collection method of clean tissue absorbing water precipitation freshly accumulated on the grass tops.. I collected precipitation from the same storm in the same general location as potrblog
Location : South Saint Louis City Missouri
Measurements were made using the same kind of Geiger counters that potrblog is using -- two of the same make and model to reduce the chance of false readings.. and also to double up on 10 minute counts (2 counters for ten mintues = 20 minutes of counting)..
thus the levels can be more easily determined via average over a set time period (10 minutes is a standard count).
Total counts :
Geiger #1 : 454 over 10 minutes or 45.4 CPM (counts per minute)
Geiger#2 : 468 over 10 minutes or 46.8 CPM (counts per minute )
----------------------
Overall this is good news --- alert level (on radiation network as one example) is set to 1000 over 10 minutes .. or 100 CPM (counts per minute).
Meaning that with these readings -- we are half way between 0 (which is impossible to achieve due to natural radiation) and 100 which is alert level.
45 CPM and 46CPM ... Saint Louis Missouri .. South Side at 1100pm CDT .. low to moderate midrange levels of radiation detected.
-------------------
Special thanks to the owners of International Medcom for sending a 2nd identical geiger counter!! If you wish to purchase this model.. here is the DIRECT manufacturer : http://www.medcom.com
And even MORE thanks to all who donated during 2011 to purchase the first geiger counter for the first round of measurements across the country.. also going to the reactors in Chicago, and Nebraska to take measurements after the leaks nd floodings...
watch all my previous radiation tests here:http://www.youtube.com/playlist?list=PL55hQ9ietGo21flF5S79gEGc3IxHYcqM2
-----------------
Here is a whole post on radiation stations globally (realtime).. also conversion charts for exposure:http://sincedutch.wordpress.com/2012/04/26/4252012-radiation-monitoring-links/
Simply put, before you read all the thanks and details.. it seems that potrblog might have gotten an unintended false high reading due to the metal he was wiping on , or the other material in the grit on the metal.
The actual precipitation is only returning moderate amounts of radiation (less than half of alert levels).
It is important to use something that is clean, and only shows the precipitation.. others must try to avoid any other particulates contaminating the samples .
I have seen several false high readings appear on youtube coming from windshields (brake pad dust is ceramic and returns false high readings for instance).. or people doing a test near large rocks like Granite .. or even people using ceramic plates to hold their measurements (ceramic produces a non-harmful high radioactive return).
It may just be that the grit on the metal and possibly the metal itself would throw off his reading. Grit/sand could easily be made up of granite -- producing a false high. Metal can produce high readings after it has oxidized.
One must collect the water in a clean plastic or glass container.. and do the test using clean tissue --- prefer to have the tissue dipped and then dry or just partially damp.. since the H20 itself can block alpha particles .
The point of these tests is to determine how much radiation is in the PRECIPITATION -- which means one should NOT introduce other particulate matter into the test .
Here is the video in question from http://www.youtube.com/potrblog --- showing VERY high returns in Saint Louis (STL) Missouri :http://www.youtube.com/watch?v=LRgpiD4TpAU
-------------
Tonight, 10/18/2012 at 1050pm CDT -- Using a basic collection method of clean tissue absorbing water precipitation freshly accumulated on the grass tops.. I collected precipitation from the same storm in the same general location as potrblog
Location : South Saint Louis City Missouri
Measurements were made using the same kind of Geiger counters that potrblog is using -- two of the same make and model to reduce the chance of false readings.. and also to double up on 10 minute counts (2 counters for ten mintues = 20 minutes of counting)..
thus the levels can be more easily determined via average over a set time period (10 minutes is a standard count).
Total counts :
Geiger #1 : 454 over 10 minutes or 45.4 CPM (counts per minute)
Geiger#2 : 468 over 10 minutes or 46.8 CPM (counts per minute )
----------------------
Overall this is good news --- alert level (on radiation network as one example) is set to 1000 over 10 minutes .. or 100 CPM (counts per minute).
Meaning that with these readings -- we are half way between 0 (which is impossible to achieve due to natural radiation) and 100 which is alert level.
45 CPM and 46CPM ... Saint Louis Missouri .. South Side at 1100pm CDT .. low to moderate midrange levels of radiation detected.
-------------------
Special thanks to the owners of International Medcom for sending a 2nd identical geiger counter!! If you wish to purchase this model.. here is the DIRECT manufacturer : http://www.medcom.com
And even MORE thanks to all who donated during 2011 to purchase the first geiger counter for the first round of measurements across the country.. also going to the reactors in Chicago, and Nebraska to take measurements after the leaks nd floodings...
watch all my previous radiation tests here:http://www.youtube.com/playlist?list=PL55hQ9ietGo21flF5S79gEGc3IxHYcqM2
-----------------
Here is a whole post on radiation stations globally (realtime).. also conversion charts for exposure:http://sincedutch.wordpress.com/2012/04/26/4252012-radiation-monitoring-links/
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