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

4.861

250620

Jun 20, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Silicon Carbide Crystal

(mBq/kg)

64.46

114.00

<627.40

<43.25

50.08

113.80

4652.50

5721.00

<585.00

<330.70

(ppb or ppm)

5.22 ppb

9.23 ppb

<50.82 ppb

<76.12 ppb

12.32 ppb

27.99 ppb

150.28 ppm

184.79 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<4296.00

378.43

588.30

<122.40

<349.30

(ppb or ppm)

<347.98 ppb

<85.93 ppb

RAMPS CW02

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)

In Progress and To Be Measured:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Run Numbers

Counting Dates
(if applicable)

RAMPS CW01

0.715 g

10.835

250620

Jun 20, 2025

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Silicon Carbide Crystal

(mBq/kg)

32.27

70.37

<496.70

<26.91

26.67

77.29

4982.00

3312.00

<610.70

<225.80

(ppb or ppm)

2.61 ppb

5.7 ppb

<40.23 ppb

<47.36 ppb

6.56 ppb

19.01 ppb

160.92 ppm

106.98 ppm

Results:

210Pb:

7Be:

54Mn:

228Ac:

(mBq/kg)

<4013.00

364.82

462.30

<121.00

<222.10

(ppb or ppm)

<325.05 ppb

<54.64 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)