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UK DM project: radioactivity test results

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Soudan data

sample (source) analysis U conc.
(ppb)
Th conc.
(ppb)
K conc.
(ppm)
comments
by method
G-10 boards J ? 100 - 150(a) 100 - 150(a)   U + Th 2 - 3 Mru
NAT E80 boards J ? < 5(a) < 5(a)   U + Th < 90 kru
NAT PC75-CEM (cellulose) boards J ? 90(a) 90(a)   U + Th 1.7 Mru
Steel (ex-RAL) H GES       total activity: 5(3) kru;
< 1 kru (2 samples)
Steel (ex-US) H GES       total activity: 67(5) kru
Analysts: Analysis methods:
H: Harwell GES: Gamma Emission Spectroscopy
J: D. Jankowski & T. Fields

Notes:

(a): from (U + Th) rates, assuming conc(U) = conc(Th).

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 1 Mru = 106 decays/day/kg