Some Useful Information Concerning the results:
The Conversion factors for the primordial nuclides are given by: 1 Bq 238U/kg = 81 ppb U (81 x 10-9 gU/g) The 238U decay chain gammas used are: 226Ra: 186.1 keV
214Pb: 295.21 and 351.92 keV
214Bi: 609.31, 1120.29, 1764.49 and 2204.21 keV
The relationships are valid for any daughters in the 238U, 235U or 232Th chain only if the chain is in equilibrium. 1 Bq 232Th/kg = 246 ppb Th (246 x 10-9 gTh/g) The 232Th decay chain gammas used are: 212Pb: 238.63 and 300.09 keV
208Tl: 583.19 and 2614.53 keV,
228Ac: 911.21 keV
1 Bq 40K/kg = 32300 ppb K (32300 x 10-6 gK/g) The 40K decay chain gamma used is: 40K: 1460.83 keV
1 Bq 235U/kg = 1.76 ppm U (1.76 x 10-6 gU/g) The 235U decay chain gammas used are: 235U: 143.76, 163.33 and 205.31 keV

The measurements of the samples below take into account the background measurements. If a measurement is below the background then the upper bound shown is the 90% confidence limit.
Picasso Measurements:



























Sample Description Manufacturer Mass (g) Live Time (days) Counting Dates
(if applicable)

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Picasso 1 Gel Sample 1 1322.4 3.446 Oct 20, 2006 (mBq/kg) 18.71 +/- 2.17 22.76 +/- 49.32 9.48 +/- 11.73 3.15 +/- 1.45 381.35 +/- 37.63 3.10 +/- 1.14 N/A

Note 134Cs Signal:
Gel Note: Sample not counted long enough to remove radon contamination

Oct 24, 2006 (ppb) 1.52 ppb +/- 0.18 ppb 1.84 ppb +/- 3.99 ppb 16.68 ppb +/- 20.65 ppb 0.77 ppb +/- 0.36 ppb 12317.67 ppb +/- 1215.35 ppb





17.14 mBq/kg +/- 1.82 mBq/kg
Picasso 2 Gel Sample 1 1332.4 5.745 Nov 13, 2006 (mBq/kg) 6.01 +/- 1.00


16.94 +/- 10.81 1.02 +/- 1.17 361.46 +/- 30.91 1.66 +/- 0.77 0.09 +/- 0.27 Note 134Cs Signal:
Gel Recounted

Nov 27, 2006 (ppb) 0.49 ppb +/- 0.08 ppb


29.81 ppb +/- 19.03 ppb 0.25 ppb +/- 0.29 ppb 11675.29 ppb +/- 998.27 ppb





15.85 mBq/kg +/- 1.13 mBq/kg
Picasso 3 Gel Sample 2 1547.0 11.017 Aug 31, 2007 (mBq/kg) 4.56 +/- 0.67





<0.59

424.24 +/- 28.1 1.94 +/- 0.53 0.14 +/- 0.25 Note 134Cs Signal:
Gel


Sep 11, 2007 (ppb) 0.37 ppb +/- 0.05 ppb





<0.15 ppb

13702.97 ppb +/- 907.54 ppb





17.04 mBq/kg +/- 0.86 mBq/kg
Picasso 4 Gel Sample 3 1773.3 5.739 Feb 19, 2008 (mBq/kg) 4.55 +/- 0.85





<0.26

26.62 +/- 7.12 71.56 +/- 4.40 N/A

Note 134Cs Signal:
Gel


Feb 25, 2008 (ppb) 0.37 ppb +/- 0.07 ppb





<0.06 ppb

859.73 ppb +/- 230.05 ppb





18.20 mBq/kg +/- 1.03 mBq/kg
Picasso 5 Gel Sample 4 1258.7 12.911 Jul 15, 2008 (mBq/kg) <0.12







<0.13

25.66 +/- 6.18 0.32 +/- 0.36 <0.05

Note 134Cs Signal:
Gel


Jul 28, 2008 (ppb) <0.01 ppb







<0.03 ppb

828.86 ppb +/- 199.63 ppb





0.21 mBq/kg +/- 0.13 mBq/kg
Picasso 6 Sample 001_2008 301.9 8.550 Nov 25, 2008 (mBq/kg) <0.60







<0.52

6.96 +- 18.97 75.52 +- 7.65 0.17 +- 0.74 Note 134Cs Signal:
CsCl & Monomer (4x)


Dec 4, 2008 (ppb or ppm) <0.05 ppb







<0.13 ppb

224.68 ppb +- 612.74 ppb





15.70 mBq/kg +- 1.60 mBq/kg






Extra information: There was also a small signal from 232Cs when counting started, however it decayed mostly away by the time counting concluded. The half life of 232Cs is 6.479 d and it is created from 233Cs through fast neutron activation.














Picasso 7 Sample 002_2008 2017.0 19.811 Dec 16, 2008 (mBq/kg) 0.20 +- 0.34 27.32 +- 18.00


0.35 +- 0.27 136.64 +- 9.99 1.29 +- 0.36 <0.24

Note 134Cs Signal:
CsCl Salt Chemetall GmbH

Jan 5, 2009 (ppb or ppm) 0.02 ppb +- 0.03 ppb 2.21 ppb +- 1.46 ppb


0.09 ppb +- 0.07 ppb 4.41 ppm +- 0.32 ppm





35.35 mBq/kg +- 1.24 mBq/kg






Extra information: There was also a small signal from 232Cs. The half life of 232Cs is 6.479 d and it is created from 233Cs through fast neutron activation.














Picasso 8 Gel Sample 5, labelled #259, sample taken Oct. 25-08 1152.9 8.812 Jan 5, 2009 (mBq/kg) 0.69 +- 0.47





<0.54

42.07 +- 9.09 <0.34

<0.08




Gel Gel from Picasso detector 129 (saltless detector)

Jan 14, 2009 (ppb or ppm) 0.06 ppb +- 0.04 ppb





<0.13 ppb

1.36 ppm +- 0.29 ppm








Picasso 9 Gel made by Parker Labs, Fairfield NJ 1041.1 g 7.395 Jun 24, 2009 (mBq/kg) 0.11 +- 0.57





3.44 +- 0.93 <7.67

<0.47

0.25 +- 0.24 228Ac Signal:
(Not in Equilibrium with rest of 232Th Chain)
Aquasonic Gel and Glycerol


Jul 2, 2009 (ppb or ppm) 0.008 ppb +- 0.044 ppb





0.81 ppb +- 0.22 ppb <247.72 ppb







<0.72 mBq/kg or <0.18 ppb
In Progress and To Be Measured:
































(mBq/kg)


























(ppb or ppm)




























(mBq/kg)




























(ppb or ppm)