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.
DarT Measurements:



























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






















DArT P01 McMaster-Carr 320.0 g 12.812 Mar 15, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Acrylic Tube PN: 8486K642
Run: 230315
23031801		 Mar 28, 2024 (mBq/kg) <0.80

28.99 +- 32.90 <0.70

<2.78

<21.67

<0.46

<0.25



3.3” ID


(ppm / ppb / ppt) <64.8 ppt

2.35 ppb +- 2.66 ppb <1.23 ppb

<0.68 ppb

<0.7 ppm















Results:
7Be:

54Mn




228Ac:















(mBq/kg) <4.22

0.71 +- 0.50


<4.16


















(ppm / ppb / ppt)








<1.02 ppb













DArT P02 McMaster-Carr 595.0 g 13.736 Mar 28, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Acrylic Tube PN; 8486K635
Run: 240328 Apr 11, 2024 (mBq/kg) 0.58 +- 0.66 <28.65

<0.46

<1.74

<10.27

<0.96

<0.26



ID: 3.75”


(ppm / ppb / ppt) 47.29 ppt +- 53.35 ppt <2.32 ppb

<0.81 ppb

<0.43 ppb

<331.72 ppb















Results:
7Be:

54Mn




228Ac:















(mBq/kg) <3.93

<0.30




<1.72


















(ppm / ppb / ppt)








<0.42 ppb













In Progress and To Be Measured:



























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






















Next Sample



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)