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UK DM project: radioactivity test results

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MINOS data

sample (source) analysis U conc.
(ppb)
Th conc.
(ppb)
K conc.
(ppm)
comments
by method
Epoxy 2216: A
                     B
A GES < 11
< 25
< 25
< 40
< 50
< 70
Equal masses of A and B.
Epoxy DP190: A
                        B
A GES 830(80)
600(60)
5500(530)
4500(440)
610(65)
340(33)
Equal masses of A and B.
Steel A GES       60Co < 1.5 kru
TiO2, 60% in polystyrene A GES 110(25) 170(50) 130(80) 60Co: 53(7) kru
Analysts: Analysis methods:
A: ANL GES: Gamma Emission Spectroscopy

Notes:

(a): Preliminary data, supplied in confidence. 60Co in steel plates reported as 1 decay/minute/kg; all others converted from reported decays/s in sample measured - details in Excel spreadsheet here.

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