COSMIC RAYS Cosmic vs. Terrestrial Radiation Research & Testing by Bill DiPuccio Solar Noon
COSMIC RAYS ~ 43.9 cpm
TERRESTRIAL ~ 35.2 cpm
COSMIC RAYS
COSMIC RAYS
~ 40.9 cpm
~ 40.5 cpm
TERRESTRIAL ~ 35.5 cpm
TERRESTRIAL ~ 35.7 cpm
COSMIC RAYS ~ 40.2 cpm
TERRESTRIAL ~ 35.0 cpm
Orientation of detector
This graph shows the cosmic ray signal superimposed on ionizing terrestrial background radiation. Since it is impossible to isolate the detector from terrestrial radiation, the two sources will necessarily overlap. Nevertheless, the signals are quite distinct, being separated on average by a 6 cpm difference. The level of cosmic rays appears to track roughly with the sun’s altitude against a constant background of terrestrial radiation. Though most cosmic rays originate from deep space, some particles emanate from the sun, especially during solar events. Primary cosmic rays (mostly protons) can only be detected at high altitudes. These collide with atmospheric molecules to produce other particles which quickly decay into muons near the surface. The experiment was performed using a Geiger counter with a “pancake” detector. The flat cylindrical shape of the GM tube (13mm x 45mm) provides a large detection area across its diameter and very small detection area along its side. By placing the tube on its side, most of the muons can be eliminated from the count. These nulls are shown above as terrestrial radiation. When the tube is laid flat, some of the terrestrial radiation is eliminated and the tube becomes more sensitive to muons. These are shown above as peaks on the graph. A snug fitting aluminum cover (fashioned from the bottom of a soda can) was left on the detector throughout the experiment to mitigate the influence of airborne Radon decay particles. Measurements were made indoors on March 16. 2011. Data is smoothed to a 15 minute average using Aware Electronics AW-Radw.
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