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

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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