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Determine the average background radiation.

2. Image

Which is most radioactive?

Background Radiation
Counts
First minute
15
Second minute
18
Third minute
19
Total counts
Average counts

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Radiation from sources
Counts per
Source Counts
Type of Item
Background
Type of Radiation
minute (cpm)
per minute (cpm)
alpha, beta, and
Source 1
Fiesta-ware plate
167
gamma
Source 2
Instant coffee
31
beta
Source 3
Salt substitute
26
beta
Source 4
Smoke alarm
33
alpha
Source 5
Cream of tartar
35
beta

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