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.
COSINUS Measurements:



























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






















COSINUS P01 Goodfellow Cambridge Ltd. 14.5 g 25.464 Apr 1, 2025 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Polyaramid Fiber SO-04-0003703
JH
1000029571
500010951
Run: 250401
250416		 Apr 28, 2025 (mBq/kg) 10.04 +- 11.21 42.27 +- 380.50 3.87 +- 6.77 <20.57

591.22 +- 172.70 <10.10

<3.11



Cache SDS Code: AR300


(ppm / ppb / ppt) 0.81 ppb +- 0.91 ppb 3.42 ppb +- 30.82 ppb 6.82 ppb +- 11.92 ppb <5.06 ppb

19.1 ppm +- 5.58 ppm













Results:
7Be:

54Mn




228Ac:















(mBq/kg) <80.98

<0.35




<40.73


















(ppm / ppb / ppt)








<10.02 ppb













COSINUS P02
287.0 g 7.916 May 12, 2025 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Aluminum Foil – Not Cleaned

Run: 250512 May 20, 2025 (mBq/kg) 1.82 +- 4.58 10460.00 +- 711.60 191.20 +- 7.42 988.60 +- 32.70 71.13 +- 34.36 3.02 +- 3.65 <2.18







(ppm / ppb / ppt) 0.15 ppb +- 0.37 ppb 847.26 ppb +- 57.64 ppb 336.51 ppb +- 13.05 ppb 243.2 ppb +- 8.04 ppb 2.3 ppm +- 1.11 ppm













Results:
7Be:

54Mn




228Ac:















(mBq/kg) <27.80

<5.25




23.90 +- 8.63
















(ppm / ppb / ppt)








5.88 ppb +- 2.12 ppb











COSINUS P03
285.6 g 12.854 May 20, 2025 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Aluminum Foil – Cleaned

Run: 250520
250526
250528		 Jun 2, 2025 (mBq/kg) <7.09

10250.00 +- 632.40 185.30 +- 6.18 891.40 +- 27.71 51.60 +- 25.25 <4.90

<2.33







(ppm / ppb / ppt) <0.57 ppb

830.25 ppb +- 51.22 ppb 326.13 ppb +- 10.87 ppb 219.28 ppb +- 6.82 ppb 1.67 ppm +- 0.82 ppm













Results:
7Be:

54Mn




228Ac:















(mBq/kg) <22.88

2.97 +- 1.92


33.09 +- 6.76
















(ppm / ppb / ppt)








8.14 ppb +- 1.66 ppb











In Progress and To Be Measured:



























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






















Next Sample



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)