Tag Archives: physics

☢ Detecting Natural Neutron Radiation! ☢

Filed under Radiation, Science
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Natural Sources of Neutron Radiation! I detect neutrons from thermal to as high as 14 MeV!

[Neutron Detector/Gamma Spectrometer]
http://www.polimaster.us/products/spectroscopic_personal_radiation_detectors/pm1703mb/

[PoliSmart Dosimeter]
http://www.polimaster.us/products/electronic_dosimeters/pm1904a_/

Uranium Glassware Shopping!

Filed under Radiation, Science
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I journey to Fredericksburg VA to find uranium glassware to buy!

(Radiation and Geiger Counters) How to Separate Alpha, Beta, Gamma

Filed under Radiation, Science
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Background 38 CPM
Total 19,262 CPM *
Beta+Gamma 14,116 CPM *
Gamma 1,392 cpm *

* values shown minus background (e.g. 19300 CPM total becomes 19,262 CPM after 38 CPM removed)

This is how we figure it out:

Alpha = Total – Beta+Gamma
Beta = Beta+Gamma – Gamma
Gamma = Gamma

We can replace the words for real values from above:
Alpha = (19262 CPM) – (14116 CPM) = 5146 CPM
Beta = (14116 CPM) – (1392 CPM) = 12724 CPM
Gamma = (1392 CPM) = 1392 CPM

The results sum back to the total, which helps us check our work:
Alpha + Beta + Gamma = 5146 CPM + 12724 CPM + 1392 CPM = 19262 CPM
——————————————————————————————

Here’s that bit about the copper lol I added it for fun, but it is correct.
Sheilding HVL of Copper: 10.2 mm
Thickness of Sample: ~4mm
Most Common Energy of Gamma: 214Bi 609.31 keV at 44.8%
e^-log(2)4mm/10.2mm = 0.76199, where d/dx e^-((ln(2)/10.2mm)*x) = (4^((-2+x)/x) log(2))/x^2

☢ Radioactive Tc99m ☢

Filed under Radiation, Science
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Technetium 99m has a half life of 6.01 hours and transitions to normal Technetium 99 via the release of surplus energy in the form of a gamma photon at 140.21 keV

Statistically Valid Detections

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The basic idea comes from z-score * sqrt(2*background)