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159

Radioactive Materials in Detector Structure

A Summary of Activities From Natural Sources In Typical Construction Materials

Disintegrations/min per gram of Material

40K

238U

232Th(583 keV)

Material

< 0.02

< 0.002

< 0.005

Magnesium (4 in.Ø x 4 in. from Dow)

< 0.02

< 0.002

< 0.01

Magnesium (ingot)

0.1

< 0.04

0.06

Magnesium (rod)

< 0.02

< 0.005

< 0.005

Stainless steel (304-L)

< 0.06

< 0.007

< 0.006

Stainless steel (304)

0.56

< 0.026

0.10

Aluminum (3003 from ALCOA)

< 0.11

< 0.026

0.08

Aluminum (1100 from ALCOA)

< 0.06

< 0.017

0.24

Aluminum (1100 from Harshaw)

< 0.05

0.04

0.42

Aluminum (6061 from Harshaw)

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