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UK DM project: radioactivity test results

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Borex/ino (Raghavan et al.) data

sample (source)	analysis		U conc. (ppb)	Th conc. (ppb)	K conc. (ppm)	comments
	by	method
Acrylic	M?	?	0.001	0.001	0.01
Glass (Schott)	M?	?	18	18	30
PM tube	M?	?	59	170	750
Pseudocumene	M?  K?	? TIMS	3 × 10-6 3 × 10-6	5 × 10-6 7 × 10-6		(R)
Pseudocumene (source I)	K K	TIMS TIMS	2.6 × 10-6 7.1 × 10-5	1.2 × 10-5 1.4 × 10-4		(F) feedstock still residue
Pseudocumene (source II)	K K K	TIMS TIMS TIMS	1.1 × 10-5 1.2 × 10-5 8.4 × 10-6	1.3 × 10-4 > 0 1.5 × 10-4		(F) feedstock still residue distillate
Steel	M?	?	5	5	10
Trimethyl borate (TMB)	M	FTA	< 6.2 × 10-5	< 0.002		(M)
Trimethyl borate	M?	?	< 3 × 10-6	< 10-6	< 10-4
Trimethyl borate as supplied	K?	TIMS	~ 3 × 10-5	~ 10-5		(R) (1 evaporated)
Trimethyl borate, distilled	K?	TIMS	< 6 × 10-6	< 10-6		(R) (1 evaporated)
Trimethyl borate, distilled	K?	TIMS	~ 5 × 10-7			(R) (100 evaporated)
Water (de-ionized)	M?	?	< 0.01	< 0.01

Notes:
Solid information on Borex has always been hard to come by; all the above values except those for TMB and those with (F), (M), or (R) in the `comments' column come from Campanella's Table 4 (see Data sources for references), in which the values for steel and PM tube alone are described as `measured values'; whether the others are sound expectations or merely inspired guesses is not apparent.

The lower TMB limits are in the text of Campanella's paper; the higher from Mitchell & Raghavan (M).

(F) values are from Fassett & Kelly; I have used the sums of their tabulated extraction(s) and residue values, since their extractions appear to be incomplete.

Other remarks: