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.

NEWS-G Measurements:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Counting Dates
(if applicable)

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

NEWS-G 001

2267.5 g

6.852

Nov 30, 2015

(mBq/kg)

5.12

0.74

<54.43

0.39

0.61

<0.63

9.58

5.93

<0.61

<0.19

Polyurea Liner Material

Spray-on-Plastics

Dec 7, 2015

(ppb or ppm)

0.41 ppb

0.06 ppb

<4.41 ppb

0.68 ppb

1.07 ppb

<0.16 ppb

309.35 ppb

191.48 ppb

NEWS-G 002

332.8 g

6.549

Apr 20, 2018

(mBq/kg)

<0.98

<77.59

<2.74

<2.53

12.59

15.14

<1.31

<0.56

Copper, Echantillon No. 1

Apr 27, 2018

(ppb or ppm)

<79.54 ppt

<6.29 ppb

<4.81 ppb

<0.62 ppb

406.65 ppb

488.90 ppb

Additional Activities:

(mBq/kg)

57Co:

0.16

2.19

228Ac:

0.88

1.83

58Co:

3.37

1.00

(ppb or ppm)

(Not in Equilibrium with other Th daughters)

0.22 ppb

0.45 ppb

NEWS-G 003

Acid etched using PNNL copper etching procedure

332.8 g

11.868

May 30, 2018

(mBq/kg)

<0.81

<24.38

0.14

1.30

<1.63

10.03

10.98

<1.00

<0.21

Copper, Echantillon No. 1

Jun 13, 2018

(ppb or ppm)

<65.49 ppt

<1.98 ppb

0.25 ppb

2.30 ppb

<0.40 ppb

323.90 ppb

354.62 ppb

Additional Activities:

(mBq/kg)

57Co:

2.42

1.52

228Ac:

1.69

1.71

58Co:

1.64

0.59

(ppb or ppm)

(Not in Equilibrium with other Th daughters)

0.42 ppb

NEWS-G 004

Made by Formlabs Ltd

147.5 g

14.687

Jul 2, 2019

(mBq/kg)

7.04

3.31

101.70

89.43

<5.42

<2.25

27.25

31.19

2.23

3.16

0.77

1.26

3D-Printed Acrylic Pieces

Jul 17, 2019

(ppb or ppm)

0.57 ppb

0.27 ppb

8.24 ppb

7.24 ppb

<9.54 ppb

<0.55 ppb

0.88 ppm

1.01 ppm

NEWS-G 005

Approx 1 foot of 1/8" SS cable with 5 SS balls (1/4") crimped

22.7 g

6.868

Sep 3, 2019

(mBq/kg)

<29.28

536.40

1035.00

<64.29

<19.57

<397.60

24.83

27.42

9.03

11.63

Steel Wire with metal balls

Made by Lexco

Sep 10, 2019

(ppb or ppm)

<2.37 ppb

43.45 ppb

83.84 ppb

<113.15 ppb

<4.81 ppb

<12.84 ppm

NEWS-G 006

Sample made by P.G.

96.8 g

8.750

Jun 23, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Wash Solution from the Naked AmBe Source

AmBe Source is soaked in cleaning solution

Run: 210623
210627
210630

Jul 2, 2021

(mBq/kg)

0.98

3.33

95.81

103.90

<3.61

<2.90

<51.11

<3.80

<0.51

Cleaning Solution: Radiacwash + Water + 2% Nitric Acid

(ppm / ppb / ppt)

0.08 ppb

0.27 ppb

7.76 ppb

8.42 ppb

<6.35 ppb

<0.71 ppb

<1.65 ppm

Results:

7Be:

54Mn

228Ac:

(mBq/kg)

<12.70

<2.15

<5.29

(ppm / ppb / ppt)

<1.3 ppb

NEWS-G 007

Sample made by P.G.

107.5 g

19.735

Jul 9, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Wash Solution from the Inner Encapsulation of the AmBe Source

AmBe Source with inner encapsulation is soaked in cleaning solution

Run:
210709

Jul 29, 2021

(mBq/kg)

<2.63

<38.89

<1.18

<3.90

<25.12

<2.87

<0.44

Cleaning Solution: Radiacwash + Water + 2% Nitric Acid

(ppm / ppb / ppt)

<0.21 ppb

<3.15 ppb

<2.08 ppb

<0.96 ppb

<0.81 ppm

Results:

7Be:

54Mn

228Ac:

(mBq/kg)

<12.50

<1.81

<4.25

(ppm / ppb / ppt)

<1.05 ppb

NEWS-G 008

Sample made by P.G.

109.8 g

10.125

Aug 23, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Wash Solution from Outer Encapsulation of AmBe Source

AmBe Source is soaked in cleaning solution

Run:
210823
210901
21090101

Sep 3, 2021

(mBq/kg)

0.56

2.54

<96.08

1.24

1.65

4.57

3.55

34.31

31.77

<3.01

<1.06

Cleaning Solution: Radiacwash + Water + 2% Nitric Acid

(ppm / ppb / ppt)

0.05 ppb

0.21 ppb

<7.78 ppb

2.18 ppb

2.9 ppb

1.13 ppb

0.87 ppb

1.11 ppm

1.03 ppm

Results:

7Be:

54Mn

228Ac:

(mBq/kg)

<22.12

<0.71

<6.90

(ppm / ppb / ppt)

<1.7 ppb

NEWS-G 009

Sample made by P.G.

328.2 g

6.750

Oct 1, 2021

Results:

238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co

Comments

Wash Solution from the canister container 37Ar gas

37Ar Source canister is soaked in cleaning solution

Oct 8, 2021

(mBq/kg)

2.02

1.45

<62.57

<1.69

1.66

1.75

36.77

16.84

41.56

4.03

0.36

0.48

Cleaning Solution: Radiacwash + Water + 2% Nitric Acid

Run: 21100101
211004

(ppm / ppb / ppt)

0.16 ppb

0.12 ppb

<5.07 ppb

<2.97 ppb

0.41 ppb

0.43 ppb

1.19 ppm

0.54 ppm

Results:

7Be:

54Mn

228Ac:

(mBq/kg)

<9.55

<0.88

0.52

2.14

(ppm / ppb / ppt)

0.13 ppb

0.53 ppb

In Progress and To Be Measured:

Sample Description

Manufacturer

Mass (g)

Live Time (days)

Counting Dates
(if applicable)

Next Sample

Queue: Empty

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)