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.

SNO+ Measurements:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Run Numbers

Counting Dates
(if applicable)

SNO+ G01

Lucas cell cylinder. R=25mm, h=~82.5mm

136.82 g

13.854

241126

Nov 25, 2024

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Lucas Cell

SN: H1

Dec 10, 2024

(mBq/kg)

940.40

22.36

12.77

39.89

<1.73

22.83

3.67

106.57

25.30

<1.59

<2.70

(ppb or ppm)

76.17 ppb

1.81 ppb

1.03 ppb

3.23 ppb

<3.04 ppb

5.62 ppb

0.9 ppb

3.44 ppm

0.82 ppm

Results:

210Pb:

7Be:

54Mn

228Ac:

(mBq/kg)

<103.30

<20.88

<2.00

<7.67

(ppb or ppm)

<8.37 ppb

<1.89 ppb

SNO+ G02

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

(mBq/kg)

(ppb or ppm)

Err:502

0 ppb

Results:

210Pb:

7Be:

54Mn

228Ac:

57Co

58Co:

(mBq/kg)

(ppb or ppm)

Err:502

0 ppb

In Progress and To Be Measured:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Run Numbers

Counting Dates
(if applicable)

SNO+ G02

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

(mBq/kg)

(ppb or ppm)

Err:502

0 ppb

Results:

210Pb:

7Be:

54Mn

228Ac:

57Co

58Co:

(mBq/kg)

(ppb or ppm)

Err:502

0 ppb