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.
HALO 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
HALO 1 John Deere Green, Gloss, Code 27039X 145 852.1 g 2.050 Apr 15, 2009 (mBq/kg) 1000.12 +- 30.61 1328.75 +- 270.61 79.98 +- 8.37 989.05 +- 26.56 547.11 +- 81.85 <0.27

<0.92




Paint Tremclad, Tremco, Toronto, ON, Made in Canada

Apr 16, 2009 (ppb or ppm) 84.19 ppb +- 2.48 pb 107.63 ppb +- 21.92 ppb 140.77 ppb +- 14.73 ppb 243.31 ppb +- 6.53 ppb 18.54 ppm +- 2.64 ppm








HALO 2 Green, Gloss, Code 27029X 145 845.1 g 3.805 Apr 16, 2009 (mBq/kg) 681.19 +- 20.54 940.58 +- 204.02 78.72 +- 6.9 720.82 +- 18.06 265.89 +- 44.94 <1.89

0.71 +- 1.79
Paint Tremclad, Tremco, Toronto, ON, Made in Canada

Apr 20, 2009 (ppb or ppm) 57.31 ppb +- 1.66 ppb 76.19 ppb +- 16.53 ppb 138.55 ppb +- 12.15 ppb 177.32 ppb +- 4.44 ppb 8.59 ppm +- 1.45 ppm








HALO 3 Lepage (Henkel) 758.4 g 1.922 Feb 15, 2010 (mBq/kg) 887.32 +- 29.56 584.93 +- 239.04 78.28 +- 8.29 353.15 +- 14.74 7272.55 +- 443.31 <3.76

<4.13


No More Nails Adhesive


Feb 17, 2010 (ppb or ppm) 71.87 ppb +- 2.39 ppb 47.38 ppb +- 19.36 ppb 137.78 ppb +- 14.59 ppb 86.88 ppb +- 3.63 ppb 234.90 ppm +- 14.32 ppm








HALO 4 Via Chem Inc. 76.3 g 7.180 Feb 22, 1010 (mBq/kg) <4.07

57.67 +- 129.75 2.8 +- 5.12 <1.05

<13.26

<4.32

<1.09


Home Bond Epoxy Two-Part Slow Setting Time Epoxy

Mar 1, 2010 (ppb or ppm) <0.33 ppb

4.67 ppb +- 10.51 ppb 4.93 ppb +- 9.02 ppb <0.26 ppb

<428.41 ppb










HALO 5 Styron 663 882.5 g 9.753 Sep 20, 2010 (mBq/kg) 1.16 +- 0.71 <14.30

0.25 +- 0.89 0.71 +- 0.68 <11.50

0.23 +- 0.61 <0.10

7Be Signal:
Polystyrene Beads


Oct 1, 2010 (ppb or ppm) 0.09 ppb +- 0.06 ppb <1.16 ppb

0.44 ppb +- 1.57 ppb 0.18 ppb +- 0.17 ppb <371.35 ppb







5.78 mBq/kg +- 3.29 mBq/kg
HALO 6 Styron 666D 1026.3 g 6.961 Feb 7, 2011 (mBq/kg) 3.70 +- 0.81 0.00 +- 21.43 <0.43

0.20 +- 0.61 1.85 +- 7.02 0.97 +- 0.68 <0.14


Polystyrene Beads


Feb 14, 2011 (ppb or ppm) 0.299 ppb +- 0.066 ppb 0.00 ppb +- 1.74 ppb <0.76 ppb

0.049 ppb +- 0.149 ppb 59.80 ppb +- 226.60 ppb








HALO 7 Batch # 2806-090910
F 400 Grit		 1099.0 g 1.005 Feb 21, 2012 (mBq/kg) 753.05 +- 36.15 721.11 +- 609.37 34.06 +- 8.36 629.48 +- 27.27 562.42 +- 105.55 <3.67

5.53 +- 3.90
Boron Carbide Powder Panadyne Inc., Warminster, PA 18974

Feb 22, 2012 (ppb or ppm) 61.00 ppb +- 2.93 ppb 58.41 ppb +- 49.36 ppb 59.95 ppb +- 14.72 ppb 154.85 ppb +- 6.71 ppb 18.17 ppm +- 3.41 ppm








HALO 8
997.3 g 6.812 Aug 17, 2015 (mBq/kg) 0.28 +- 0.63 12.85 +- 15.22 0.37 +- 0.75 3.29 +- 0.73 7.25 +- 6.83 0.08 +- 0.60 <0.14


HALO Wash from Cf Source Equipment, May 2016


Aug 24, 2015 (ppb or ppm) 0.023 ppb +- 0.051 ppb 1.04 ppb +- 1.23 ppb 0.65 ppb +- 1.31 ppb 0.81 ppb +- 0.18 ppb 234.00 ppb +- 220.69 ppb








HALO 9 Sample prepared on Oct. 30, 2015 869.3 g 3.062 Nov 23, 2015 (mBq/kg) 0.70 +- 1.12 <36.73

<1.24

<1.05

<14.29

0.61 +- 1.06 2.15 +- 0.84 54Mn Signal:
HALO Rinse Solution from Cf Source Inner Encapsulation


Nov 26, 2015 (ppb or ppm) 0.057 ppb +- 0.090 ppb <2.98 ppb

<2.17 ppb

<0.26 ppb

<461.44 ppb







1.03 mBq/kg +- 0.77 mBq/kg
HALO 10 Sample prepared on January 30, 2016 1078.0 g 2.735 Feb 2, 2016 (mBq/kg) 0.35 +- 0.91 <23.91

<2.22

23.38 +- 2.66 49.00 +- 17.24 <1.39

<0.33


HALO Cf Source Stage 10 Wash Solution


Feb 5, 2016 (ppb or ppm) 0.028 ppb +- 0.074 ppb <1.94 ppb

<3.90 ppb

5.75 ppb +- 0.65 ppb 1.58 ppm +- 0.56 ppm









Additional Activities:
(mBq/kg)





228Ac: <1.27

Note that the sample is contaminated with Pb212. After 20 Pb212 half lives the effective strength of the Th chain is calculated to be: <55.84








(ppb or ppm)




(Not in Equilibrium with other Th daughters) <0.31 ppb

<13.74 ppb







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

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
HALO 11 Sample prepared on January 30, 2016 747.0 g 2.924 Feb 26, 2016 (mBq/kg) 2.05 +- 1.42 <17.72

<1.37

<1.28

25.28 +- 17.03 <1.67

<0.73


HALO Cf Source, Stage 8 scrub and sand, Wash Solution


Feb 29, 2016 (ppb or ppm) 0.17 ppb +- 0.12 ppb <1.44 ppb

<2.40 ppb

<0.32 ppb

816.62 ppb +- 550.10 ppb








HALO 12 Sample prepared on Feb. 8, 2016 1029.7 g 2.736 Feb 9, 2016 (mBq/kg) 0.62 +- 0.95 25.56 +- 25.41 <1.69

<1.24

<10.38

<1.25

<0.29


HALO Cf Source, Outer Encapsulation Wash and Rinse


Feb 12, 2016 (ppb or ppm) 0.050 ppb +- 0.077 ppb 2.07 ppb +- 2.06 ppb <2.97 ppb

<0.31 ppb

<335.36 ppb










HALO 13 Sample prepared on Feb. 8, 2016 962.5 g 3.717 Feb 12, 2016 (mBq/kg) 1.24 +- 0.92 <24.91

0.69 +- 1.09 0.83 +- 0.73 14.41 +- 10.43 <0.26

<0.24


HALO Dummy Source Wash and Rinse Solution


Feb 16, 2016 (ppb or ppm) 0.101 ppb +- 0.074 ppb <2.02 ppb

1.22 ppb +- 1.92 ppb 0.20 ppb +- 0.18 ppb 465.42 ppb +- 336.73 ppb








In Progress and To Be Measured:
































(mBq/kg)


























(ppb or ppm)