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UK DM project: radioactivity test results

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GALLEX data

sample (source) analysis U conc.
(ppb)
Th conc.
(ppb)
K conc.
(ppm)
comments
by method
Cu ? ? < 0.006 < 0.025 < 0.065  
Fe cathode ? ? < 0.002 < 0.007 ~ 0.002  
Quartz ? ? < 0.0067 < 2.5 10-4 < 0.0013  

Notes:
Converted from reported values in mBq kg-1. Hand-written on the transparency appears to be a U concentration in quartz one-tenth of what I obtain; I have no way of telling which value is correct - the printed 1.2 mBq kg-1 or the written .66 ppt.

Other remarks:

ppm: parts per million by weight, = conc. 106 ppb: parts per (US) billion by weight, = conc. 109
ppt: parts per (US) trillion by weight, = conc. 1012   errors: 0.035(10) (e.g.) means 0.035 0.01 (1 s.)
1 kru = 103 decays/day/kg