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.
RAMPS Measurements:




























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






















RAMPS CW01
0.715 g 27.058 250620
250708
25070802		 Jun 20, 2025 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Silicon Carbide Crystal



Jul 8, 2025 (mBq/kg) <71.40

<361.50

<15.08

19.59 +- 54.72 2382.50 +- 2104.00 <618.70

<114.80








(ppb or ppm) <5.78 ppb

<29.28 ppb

<26.54 ppb

4.82 ppb +- 13.46 ppb 76.95 ppm +- 67.96 ppm












Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) <3593.00

164.34 +- 350.50 <86.80

45.60 +- 92.95















(ppb or ppm) <291.03 ppb







11.22 ppb +- 22.87 ppb









RAMPS CW02
1.7 g 3.879 260703
26070301		 Jul 3, 2026 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
SiPM, ARRAY J-60035-4P-PCB



Jul 7, 2026 (mBq/kg) 12130.00 +- 718.60 12470.00 +- 1540.00 633.20 +- 56.55 16690.00 +- 1144.00 47858.00 +- 9992.00 <290.00

153.90 +- 330.30






(ppb or ppm) 982.53 ppb +- 58.21 ppb 1010.07 ppb +- 124.74 ppb 1114.43 ppb +- 99.53 ppb 4105.74 ppb +- 281.42 ppb 1545.81 ppm +- 322.74 ppm












Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) 10403.00 +- 2643.00 <877.10

<239.00

14030.00 +- 1037.00















(ppb or ppm) 842.64 ppb +- 214.08 ppb





3451.38 ppb +- 255.1 ppb









In Progress and To Be Measured:




























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






















RAMPS CW03 Size: 6mm x 6mm 0.456 g 15.401 260707
260714		 Jul 7, 2026 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
SiPM, Hamamatsu, S14160-6050HS (x 4)



(mBq/kg) 2374.00 +- 365.20 1306.00 +- 867.20 182.90 +- 41.30 723.40 +- 215.70 11607.00 +- 7141.00 <909.50

<314.80








(ppb or ppm) 192.29 ppb +- 29.58 ppb 105.79 ppb +- 70.24 ppb 321.9 ppb +- 72.69 ppb 177.96 ppb +- 53.06 ppb 374.91 ppm +- 230.65 ppm












Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg) <4099.00

<1987.00

<278.00

907.70 +- 435.30















(ppb or ppm) <332.02 ppb







223.29 ppb +- 107.08 ppb









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:

57Co

58Co












(mBq/kg)



























(ppb or ppm)