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.
QBITS-CUTE Measurements:



























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






















QBITS-CUTE 01
377.9 g 8.791 Jul 26, 2022 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Amumetal Circulators with Cryoperm Shield

Run: 220726
220728
220729
22072901		 Aug 5, 2022 (mBq/kg) 41.11 +- 3.30 135.00 +- 115.50 10.07 +- 1.91 22.43 +- 3.22 45.50 +- 18.64 <1.84

2.52 +- 0.95



220731
220803
(ppm / ppb / ppt) 3.33 ppb +- 0.27 ppb 10.94 ppb +- 9.36 ppb 17.72 ppb +- 3.36 ppb 5.52 ppb +- 0.79 ppb 1.47 ppm +- 0.6 ppm












Results:
7Be:

54Mn




228Ac:
57Co
58Co











(mBq/kg) <15.03

<1.08




24.04 +- 4.63 <5.92

<2.21












(ppm / ppb / ppt)








5.91 ppb +- 1.14 ppb











QBITS-CUTE 02 Cables include non-magnetic connectors 20.2 g 9.715 Aug 5, 2022 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
EZForm Cables

Run: 220805
220807
220809
220811
220813		 Aug 17, 2022 (mBq/kg) <37.71

787.70 +- 1024.00 <14.16

<38.93

233.56 +- 289.60 <21.04

<2.78





220815
22081501
220816
220817
(ppm / ppb / ppt) <3.05 ppb

63.8 ppb +- 82.94 ppb <24.92 ppb

<9.58 ppb

7.54 ppm +- 9.35 ppm












Results:
7Be:

54Mn




228Ac:
57Co
58Co











(mBq/kg) <163.70

<9.38




44.08 +- 38.06 <67.73

8.50 +- 8.25










(ppm / ppb / ppt)








10.84 ppb +- 9.36 ppb











QBITS-CUTE 03
15.6 g 14.569 Aug 17, 2022 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Amumetal Plate

Run: 22081701
220825		 Sep 1, 2022 (mBq/kg) <19.97

572.50 +- 544.60 <15.10

<36.87

1017.90 +- 305.10 <13.73

<4.42







(ppm / ppb / ppt) <1.62 ppb

46.37 ppb +- 44.11 ppb <26.58 ppb

<9.07 ppb

32.88 ppm +- 9.85 ppm












Results:
7Be:

54Mn




228Ac:
57Co
58Co











(mBq/kg) <144.30

<8.38




71.58 +- 35.55 37.42 +- 27.09 <20.99












(ppm / ppb / ppt)








17.61 ppb +- 8.75 ppb











QBITS-CUTE 04 Kurt J Lesker (99.999% Pure) 139.063 g 6.854 Feb 24, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Used Aluminum Old Melts Plussys E-Beam
Run: 230224 Mar 3, 2023 (mBq/kg) <3.94

<85.72

<2.78

9.48 +- 3.60 <26.85

<1.73

<0.65



5 Units


(ppm / ppb / ppt) <0.32 ppb

<6.94 ppb

<4.89 ppb

2.33 ppb +- 0.89 ppb <0.87 ppm














Results:
7Be:

54Mn




228Ac:
57Co
58Co

24Na








(mBq/kg) <24.16

<1.46




<8.38

<2.99

<0.81

<0.92









(ppm / ppb / ppt)








<2.06 ppb













QBITS-CUTE 05 Kurt J Lesker (99.999% Pure) 24.851 g 13.159 Mar 3, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Used Aluminum Old Melts Plussys E-Beam
Run: 230303
230314		 Mar 14, 2023 (mBq/kg) <3.57

<403.50

<4.80

83.00 +- 12.13 97.45 +- 86.53 <5.44

<3.35



2 Units


(ppm / ppb / ppt) <0.29 ppb

<32.68 ppb

<8.45 ppb

20.42 ppb +- 2.98 ppb 3.15 ppm +- 2.79 ppm












Results:
7Be:

54Mn




228Ac:
57Co
58Co

24Na








(mBq/kg) <66.02

3.57 +- 3.68


<16.06

<6.04

<1.86

<2.05









(ppm / ppb / ppt)








<3.95 ppb













QBITS-CUTE 06 Chalmers University of Technology 94.08 g 7.889 Mar 20, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Copper Piece Copper Sample
Run: 230320
230322		 Mar 28, 2023 (mBq/kg) <2.36

<130.80

1.23 +- 1.58 <4.86

<65.12

<5.91

<0.83







(ppm / ppb / ppt) <0.19 ppb

<10.59 ppb

2.16 ppb +- 2.79 ppb <1.2 ppb

<2.1 ppm














Results:
7Be:

54Mn




228Ac:
57Co
58Co











(mBq/kg) <14.98

<3.12




<9.31

8.03 +- 4.37 3.27 +- 1.64










(ppm / ppb / ppt)








<2.29 ppb













QBITS-CUTE 07 Chalmers University of Technology 33.207 g 6.868 Apr 4, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Aluminum Alloy Semi-Disk

Run: 230404 Apr 11, 2023 (mBq/kg) 16.15 +- 14.37 7385.00 +- 1143.00 166.10 +- 15.81 339.40 +- 33.35 <193.20

<29.50

<3.79







(ppm / ppb / ppt) 1.31 ppb +- 1.16 ppb 598.19 ppb +- 92.58 ppb 292.34 ppb +- 27.83 ppb 83.49 ppb +- 8.2 ppb <6.24 ppm














Results:
7Be:

54Mn




228Ac:
57Co
58Co

24Na








(mBq/kg) <121.40

<14.51




128.20 +- 35.77 <31.25

<6.11

<8.26









(ppm / ppb / ppt)








31.54 ppb +- 8.8 ppb











QBITS-CUTE 08 Chalmers University of Technology 8.164 g 7.778 Apr 11, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Gold Plated Printed Circuit Boards Two Units
Run: 230411 Apr 19, 2023 (mBq/kg) 1579.00 +- 88.90 8911.00 +- 1977.00 79.73 +- 23.91 2032.00 +- 117.60 1840.50 +- 493.90 <72.45

<23.66







(ppm / ppb / ppt) 127.9 ppb +- 7.2 ppb 721.79 ppb +- 160.14 ppb 140.32 ppb +- 42.08 ppb 499.87 ppb +- 28.93 ppb 59.45 ppm +- 15.95 ppm












Results:
7Be:

54Mn




228Ac:















(mBq/kg) <300.40

63.255 +- 33.25


1676.00 +- 152.00
















(ppm / ppb / ppt)








412.3 ppb +- 37.39 ppb











QBITS-CUTE 09 Chalmers University of Technology 18.036 g 19.798 Apr 19, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Aluminum Alloy Disks Four Units
Run: 230419 May 9, 2023 (mBq/kg) <9.56

465.70 +- 335.20 <11.00

273.10 +- 20.97 <106.90

<11.05

<2.03







(ppm / ppb / ppt) <0.77 ppb

37.72 ppb +- 27.15 ppb <19.36 ppb

67.18 ppb +- 5.16 ppb <3.45 ppm














Results:
7Be:

54Mn




228Ac:















(mBq/kg) <105.70

<4.55




<38.27


















(ppm / ppb / ppt)








<9.41 ppb













QBITS-CUTE 10 Chalmers University of Technology 220.0 g 6.875 Nov 29, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Sample Holder Sample #1
Run: 231129 Dec 6, 2023 (mBq/kg) 20.37 +- 3.28 1099.00 +- 195.40 28.56 +- 2.62 38.44 +- 4.70 60.24 +- 25.46 <3.02

<0.80







(ppm / ppb / ppt) 1.65 ppb +- 0.27 ppb 89.02 ppb +- 15.83 ppb 50.27 ppb +- 4.61 ppb 9.46 ppb +- 1.16 ppb 1.95 ppm +- 0.82 ppm













Results:
7Be:

54Mn




228Ac:















(mBq/kg) <12.60

<2.07




43.43 +- 6.71
















(ppm / ppb / ppt)








10.68 ppb +- 1.65 ppb











QBITS-CUTE 11 Chalmers University of Technology 7.835 g 5.875 Dec 6, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
PCB ELCO Bluefors: Elco BV, Hofsttetter, EPIG Plating
Run: 231206
231209		 Dec 12, 2023 (mBq/kg) 1499.00 +- 101.20 6132.00 +- 1973.00 106.50 +- 27.94 2232.00 +- 138.90 1380.10 +- 567.80 <37.97

<26.02



Sample #3
2 units


(ppm / ppb / ppt) 121.42 ppb +- 8.2 ppb 496.69 ppb +- 159.81 ppb 187.44 ppb +- 49.17 ppb 549.07 ppb +- 34.17 ppb 44.58 ppm +- 18.34 ppm













Results:
7Be:

54Mn




228Ac:















(mBq/kg) 314.92 +- 346.20 <49.27




2210.00 +- 196.10
















(ppm / ppb / ppt)








543.66 ppb +- 48.24 ppb











QBITS-CUTE 12 Chalmers University of Technology 38.46 g 6.889 Dec 12, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Ceramic Strips Sample #7-1
Run: 231212 Dec 19, 2023 (mBq/kg) 18.60 +- 10.11 3233.00 +- 642.40 50.44 +- 8.31 137.20 +- 19.81 <166.50

<11.50

<4.99







(ppm / ppb / ppt) 1.51 ppb +- 0.82 ppb 261.87 ppb +- 52.03 ppb 88.77 ppb +- 14.63 ppb 33.75 ppb +- 4.87 ppb <5.38 ppm















Results:
7Be:

54Mn




228Ac:















(mBq/kg) 16.97 +- 50.94 <11.47




32.63 +- 19.47
















(ppm / ppb / ppt)








8.03 ppb +- 4.79 ppb











QBITS-CUTE 13 Chalmers University of Technology 10.645 g 9.083 Dec 19, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Ceramic Plates Sample #7-2
Run: 231219 Dec 28, 2023 (mBq/kg) <35.00

3718.00 +- 1045.00 71.15 +- 16.22 36.63 +- 31.79 <266.70

<30.40

<7.33



Sample #3
3 units


(ppm / ppb / ppt) <2.84 ppb

301.16 ppb +- 84.65 ppb 125.22 ppb +- 28.55 ppb 9.01 ppb +- 7.82 ppb <8.61 ppm















Results:
7Be:

54Mn




228Ac:















(mBq/kg) <124.70

<15.35




<35.19


















(ppm / ppb / ppt)








<8.66 ppb













In Progress and To Be Measured:



























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






















Next Sample

Queue: Empty
Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments




(mBq/kg)


























(ppm / ppb / ppt)



























Results:
7Be:

54Mn




228Ac:















(mBq/kg)




























(ppm / ppb / ppt)