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



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)























COSINUS P02



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)























In Progress and To Be Measured:



























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























COSINUS P01 Goodfellow Cambridge Ltd. 14.5 g 25.930 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) 9.53 +- 11.32 67.97 +- 388.60 3.74 +- 6.84 <20.99

566.28 +- 172.90 <9.74

<3.26



Cache SDS Code: AR300


(ppm / ppb / ppt) 0.77 ppb +- 0.92 ppb 5.51 ppb +- 31.48 ppb 6.58 ppb +- 12.03 ppb <5.16 ppb

18.29 ppm +- 5.58 ppm













Results:
7Be:

54Mn




228Ac:















(mBq/kg) <86.54

<9.10




<39.80


















(ppm / ppb / ppt)








<9.79 ppb













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)