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.
COSINUS Measurements:




























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






















COSINUS CW01 Rope is 1 m long 0.71 g 18.471 241121 Nov 21, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Kevlar Rope



Dec 10, 2024 (mBq/kg) <33.26

<339.20

34.81 +- 11.77 13.86 +- 58.67 4895.80 +- 2542.00 <550.50

<115.40








(ppb or ppm) <2.69 ppb

<27.48 ppb

61.27 ppb +- 20.72 ppb 3.41 ppb +- 14.43 ppb 158.13 ppm +- 82.11 ppm












Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) <2620.00

<423.50

<46.78

122.30 +- 111.50















(ppb or ppm) <212.22 ppb







30.09 ppb +- 27.43 ppb









COSINUS CW02 Rope is 1 m long 0.71 g 13.939 250218
250301		 Feb 18, 2025 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Kevlar Rope – Soaked in UPW The rope was soaked in UPW and then dried for counting


Mar 10, 2025 (mBq/kg) <97.17

<483.30

<28.42

244.40 +- 71.17 4618.50 +- 2679.00 <554.9

<130.70








(ppb or ppm) <7.87 ppb

<39.15 ppb

<50.02 ppb

60.12 ppb +- 17.51 ppb 149.18 ppm +- 86.53 ppm












Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 164280.00 +- 9623.00 <576.00

<62.15

359.40 +- 125.50















(ppb or ppm) 13.31 ppm +- 0.78 ppm





88.41 ppb +- 30.87 ppb









COSINUS CW03 ID: 0140081010000800 4.879 g 13.725 250331 Mar 31, 2025 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
AISI 316 Steel Pins Werkstoff: 1.4401 (316 Steel)


Apr 14, 2025 (mBq/kg) <15.04

<214.30

<3.63

<20.52

13121.00 +- 664.70 <95.64

<40.93



Charge: BA-170560



(ppb or ppm) <1.22 ppb

<17.36 ppb

<6.39 ppb

<5.05 ppb

423.81 ppm +- 21.47 ppm












Results: 210Pb:
7Be:

54Mn:

228Ac:













Quantity: 100



(mBq/kg) <7794.00

<64.72

6.16 +- 14.53 37.31 +- 22.53















(ppb or ppm) <0.63 ppm







9.18 ppb +- 5.54 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)