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: 234Th: 63.29 and 92.59 keV
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: 277.371, 583.19, 860.557 and 2614.53 keV,
228Ac: 209.253, 338.320, 463,004, 911.21, 964.766 and 968.971 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 from the background table.
If a measurement is below the background then the upper bound shown is the 90% confidence limit.
QBITS-CUTE Measurements:




























QBITS-CUTE 01 Homemade IR filters (CNTs) 68.8 g 13.408 220712
220720
220721
22072101		 Jul 12, 2022 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
IR Filter
3 Pieces

Jul 26, 2022 (mBq/kg) 3.53 +- 1.61 193.30 +- 37.37 5.38 +- 0.61 9.63 +- 2.04 57.84 +- 34.61 <0.89

<3.62








(ppb or ppm) 0.29 ppb +- 0.13 ppb 15.66 ppb +- 3.03 ppb 9.47 ppb +- 1.07 ppb 2.37 ppb +- 0.5 ppb 1.87 ppm +- 1.12 ppm













Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co












(mBq/kg) 753.24 +- 876.40 0.87 +- 0.59 <0.15

11.46 +- 3.13 <0.063

<0.34











(ppb or ppm) 61.01 ppb +- 70.99 ppb





2.82 ppb +- 0.77 ppb









QBITS-CUTE 02
6.2 g 8.708 220726
220728
220729
22072901		 Jul 26, 2022 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
NbTI Coaxial Cable with Connectors


220731
220803		 Aug 5, 2022 (mBq/kg) 56.60 +- 13.82 17470.00 +- 1043.00 352.20 +- 13.31 509.40 +- 33.78 137.77 +- 146.40 <58.40

<9.25








(ppb or ppm) 4.58 ppb +- 1.12 ppb 1415.07 ppb +- 84.48 ppb 619.87 ppb +- 23.43 ppb 125.31 ppb +- 8.31 ppb 4.45 ppm +- 4.73 ppm













Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 11055.00 +- 4231.00 <150.20

<16.52

527.00 +- 49.22















(ppb or ppm) 895.46 ppb +- 342.71 ppb





129.64 ppb +- 12.11 ppb









QBITS-CUTE CW03
10.0 g 6.711 230210 Feb 10, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Used Sample Holder Circuit Boards
5 Units

Feb 17, 2023 (mBq/kg) 270.40 +- 18.18 419.30 +- 94.71 15.22 +- 2.70 220.50 +- 18.03 3593.40 +- 686.70 <39.71

9.72 +- 15.07






(ppb or ppm) 21.9 ppb +- 1.47 ppb 33.96 ppb +- 7.67 ppb 26.79 ppb +- 4.75 ppb 54.24 ppb +- 4.44 ppb 116.07 ppm +- 22.18 ppm













Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 1610.10 +- 717.70 <42.98

<15.71

200.90 +- 26.82















(ppb or ppm) 130.42 ppb +- 58.13 ppb





49.42 ppb +- 6.6 ppb









QBITS-CUTE CW04
10.7 g 6.866 230217 Feb 17, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
New Sample Holder Circuit Boards
5 Units

Feb 24, 2023 (mBq/kg) 241.60 +- 16.41 459.10 +- 83.62 11.70 +- 2.48 208.70 +- 16.62 1802.20 +- 517.10 <40.46

<25.22








(ppb or ppm) 19.57 ppb +- 1.33 ppb 37.19 ppb +- 6.77 ppb 20.59 ppb +- 4.36 ppb 51.34 ppb +- 4.09 ppb 58.21 ppm +- 16.7 ppm













Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) <984.90

47.63 +- 40.28 <13.69

174.60 +- 24.30















(ppb or ppm) <79.78 ppb







42.95 ppb +- 5.98 ppb









QBITS-CUTE CW05 Kurt-J Lesker (99.999% Pure) 4.246 g 6.759 230224
230228		 Feb 24, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Aluminum Pellets (New)



Mar 3, 2023 (mBq/kg) <13.58

<133.00

<6.66

16.20 +- 13.42 <754.90

<90.26

<12.60








(ppb or ppm) <1.1 ppb

<10.77 ppb

<11.72 ppb

3.99 ppb +- 3.3 ppb <24.38 ppm















Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co

24Na









(mBq/kg) <967.10

<128.60

<15.93

41.26 +- 18.96 9.16 +- 4.55 <16.20

<38.64








(ppb or ppm) <78.34 ppb







10.15 ppb +- 4.66 ppb









QBITS-CUTE CW06 Alfa Aeser Puratonics (99.999% Pure) 1.97 g 13.031 230303
230314		 Mar 3, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Aluminum Slugs (New)



Mar 17, 2023 (mBq/kg) <17.31

<131.90

<7.83

<18.91

1780.10 +- 962.00 <209.00

<38.08








(ppb or ppm) <1.4 ppb

<10.68 ppb

<13.78 ppb

<4.65 ppb

57.5 ppm +- 31.07 ppm













Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co

24Na









(mBq/kg) <1762.00

<160.60

<37.99

53.61 +- 43.65 <15.02

<27.79

<47.76








(ppb or ppm) <142.72 ppb







13.19 ppb +- 10.74 ppb









QBITS-CUTE CW07 Kurt-J Lesker (99.995% Pure) 2.66 g 10.704 230317 Mar 17, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Titanium Pellets (New)



Mar 28, 2023 (mBq/kg) 21.97 +- 20.06 <154.40

5.00 +- 4.34 <23.08

<1538.00

<129.80

<72.47








(ppb or ppm) 1.78 ppb +- 1.62 ppb <12.51 ppb

8.8 ppb +- 7.63 ppb <5.68 ppb

<49.68 ppm















Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) <2802.00

<137.70

<45.93

<47.48

















(ppb or ppm) <226.96 ppb







<11.68 ppb











QBITS-CUTE CW08 Chalmers University of Technology 4.806 g 6.866 230328 Mar 28, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Tin Plated Printed Circuit Boards



Apr 4, 2023 (mBq/kg) 5386.00 +- 191.30 9544.00 +- 688.60 304.20 +- 16.54 6481.00 +- 250.10 7503.00 +- 1695.00 <70.62

<69.07



13 units



(ppb or ppm) 436.27 ppb +- 15.5 ppb 773.06 ppb +- 55.78 ppb 535.39 ppb +- 29.11 ppb 1594.33 ppb +- 61.52 ppb 242.35 ppm +- 54.75 ppm













Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 3163.10 +- 1665.00 <376.80

199.85 +- 78.96 6254.00 +- 253.10















(ppb or ppm) 256.21 ppb +- 134.87 ppb





1538.48 ppb +- 62.26 ppb









QBITS-CUTE CW09 Chalmers University of Technology 12.9568 g 6.812 231129 Nov 29, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
IR Filter from Bluefors



Dec 6, 2023 (mBq/kg) <8.66

1459.00 +- 216.50 28.91 +- 3.36 20.58 +- 9.11 505.53 +- 297.60 <40.70

<20.96



Sample #2



(ppb or ppm) <0.7 ppb

118.18 ppb +- 17.54 ppb 50.88 ppb +- 5.92 ppb 5.06 ppb +- 2.24 ppb 16.33 ppm +- 9.61 ppm













Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 77515.00 +- 5479.00 <55.55

8.86 +- 9.63 23.51 +- 13.18















(ppb or ppm) 6.28 ppm +- 0.44 ppm





5.78 ppb +- 3.24 ppb









QBITS-CUTE CW10 Chalmers University of Technology 5.092 g 5.843 231206
231209		 Dec 6, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Screws M2 Brass screws small 16 units Skruvcenter


Dec 12, 2023 (mBq/kg) <14.96

<62.19

<6.64

<11.83

391.51 +- 525.70 <79.64

27.71 +- 28.12

Sample #5
16 units



(ppb or ppm) <1.21 ppb

<5.04 ppb

<11.69 ppb

<2.91 ppb

12.65 ppm +- 16.98 ppm













Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) <603.70

<146.40

<15.44

<30.20

















(ppb or ppm) <48.9 ppb







<7.43 ppb











QBITS-CUTE CW11 Chalmers University of Technology 0.584 g 6.860 231212 Dec 12, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
PCB Circuits AlOx Tin plated PCB from CERcuits


Dec 19, 2023 (mBq/kg) 3337.00 +- 276.70 8104.00 +- 1197.00 189.50 +- 41.39 6149.00 +- 407.20 14077.00 +- 7897.00 <679.10

<469.20



Sample #6



(ppb or ppm) 270.3 ppb +- 22.41 ppb 656.42 ppb +- 96.96 ppb 333.52 ppb +- 72.85 ppb 1512.65 ppb +- 100.17 ppb 454.69 ppm +- 255.07 ppm









2 Units



Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) <4672.00

984.92 +- 946.92 <228.90

4253.00 +- 573.20















(ppb or ppm) <378.43 ppb







1046.24 ppb +- 141.01 ppb









QBITS-CUTE CW12 Chalmers University of Technology 1.506 g 9.007 231219 Dec 19, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Circuit Boards PCB from CIRcuits


Dec 28, 2023 (mBq/kg) 3144.00 +- 161.80 6719.00 +- 604.50 215.90 +- 21.15 5079.00 +- 256.10 2901.80 +- 2820.00 <323.40

<153.20



Sample #8-1



(ppb or ppm) 254.66 ppb +- 13.11 ppb 544.24 ppb +- 48.96 ppb 379.98 ppb +- 37.22 ppb 1249.43 ppb +- 63 ppb 93.73 ppm +- 91.09 ppm









5 Units



Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 1439.30 +- 1707.00 <335.30

132.08 +- 109.00 4354.00 +- 307.10















(ppb or ppm) 116.58 ppb +- 138.27 ppb





1071.08 ppb +- 75.55 ppb









In Progress and To Be Measured:




























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






















Next Sample




Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments






(mBq/kg)



























(ppb or ppm)




























Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg)



























(ppb or ppm)