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160

Radioactive Materials in Detector Structure

0.04

0.005

0.002

Lacquer

0.19

0.01

0.006

Epoxy

4.5

1.3

0.25

Cement (Portland)

< 0.1

< 0.06

< 0.04

Electrical tape—3M

Disintegrations/min per gram of Material

40K

238U

232Th(583 keV)

Material

2.7

4.5

4.5

Apiezon Q

2.0

1.0

0.12

Rubber

0.36

< 0.01

< 0.008

Neoprene

9.0

3.0

4.4

Molecular sieve

< 0.07

< 0.018

< 0.018

Quartz window

3.8

0.27

0.45

Pyrex window

< 0.2

< 0.06

<0.05

Copper (sheet)

< 0.2

< 0.06

< 0.02

Beryllium copper alloy

< 0.05

< 0.03

< 0.05

Magnesium (from PGT)

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