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UK DM project: radioactivity test results

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Rock data (underground sites)

sample (source)

analysis

U conc.
(ppb)

Th conc.
(ppb)

K conc.
(ppm)

comments

by

method

ZS3 Evaporite (halite)

S
I
J

AA
NAA
GES

-       
< 60
10(10)

-       
< 100
220(40)

> 400 (a)
-       
750(50)

 

ZS3 Evaporite (halite) - JIF

E

GDMS

15(2)

25(2)

1200(120)

~ 1 g paler part of mid-JIF sample

ZS3 Evaporite (halite)

U

GES

105(10)
70(10)

140(10)
125(10)

1280(200)
1130(200)

`Old' cavern
New (JIF) cavern

Gran Sasso (LNGS)
    Lab A
    Lab B
    Lab C

B

GES

180 - 670
< 650
420(100)
670(140)

60 - 400
< 120
60(20)
70(25)

100 - 2000
< 160
160(40)
95(45)


214Bi ~ 80(20) ppb U

SNO: range
    Norite

A

NAA

103 - 2.5104
1200

2103 - 7104
3300


1.15104

 

Soudan

R

GES

80 - 100 (b)

200 - 250 (c)

800 - 4104

 

Possible SNBO sites: Nevada
        WIPP/Carlsbad
 



J



GES

3000 - 5000
30 - 110
440(80)

(1.5 - 2.3)104
80 - 150
970(260)

(3.4 - 4.5)104
100 - 5000
4870(60)

 

 

Analysts:

Analysis methods:

A: AECL

AA: Atomic Absorption spectroscopy

B: E. Bellotti

GES: Gamma Emission Spectroscopy

I: ICI Tracerco

NAA: Neutron Activation Analysis

J: J. C. Barton

 

R: K. Ruddick

 

S: RAL

 

U: UK Dark Matter Collaboration

 

Notes:

(a):

K extraction by H2O - may be incomplete.

(b):

from 214Bi g count, U chain assumed in equilibrium; 2.20 gs in chain.

(c):

from 208Tl g count, Th chain assumed in equilibrium; 2.65 gs in chain.

SNBO:

Supernova Neutrino Burst Observatory (see D. Cline et al.)

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