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At one time, strontium-90 was the major man-made beta emitter in the environment. Fallout from atmospheric nuclear testing from the 1950's to the early 1970's spread strontium-90 worldwide. However, most of the strontium-90 from these tests has now decayed away. Testing also released large amounts of cesium-137 into the environment. Although, cesium-137 emits beta radiation, its gamma radiation is of greater concern. Some cesium-137 from fallout remains in the environment, but most of it has decayed as well.
beta radiation is the emission of a high-energy electron or positron
State CA
Location San Francisco
Date Posted 03/30/2011
Date Collected 03/18/2011
Sample Type Air Filter
Unit pCi/m3
Ba-140
Co-60
Cs-134 - 0.000921
Cs-136
Cs-137 - 0.0013
I-131 - 0.068
I-132 - 0.0066
I-133 - 0.002
Te-129
Te-129m
Te-132 - 0.0075
government, data, radiation, japan, radnet, epa, milk, precipitation, drinking, water, rain, snow, sleet, air, filter, cartridge
The beta gross count rate measures the radiation from all radionuclides that emit beta particles, which is indicated by the term gross or total. The term count rate tells us how quickly beta particles are being detected, which indicates how much radioactivity the monitor is seeing.
Originally posted by DancedWithWolves
reply to post by NoAngel2u
That means it tracked from the South and then spread north then west...based on these few hits. Great find.
Originally posted by DancedWithWolves
Being the level these spikes are - what would be the risk to human health with that significant of a spike? I can't imagine it is "negligible."
most beta particles can be stopped by a few millimeters of aluminum