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.
HALO Measurements:




























HALO CW01 HALO Cf-252 Source 34.012 g
221104 Nov 4, 2022 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
SRS-10-003 Cf-252 Source



Nov 4, 2022 (mBq/kg)






















Special measurement to determine strength of the HALO source



(ppb or ppm)




























Results: 210Pb:
7Be:

54Mn:

228Ac:


















(mBq/kg)



























(ppb or ppm)





















HALO CW02 HALO Cf-252 “Dummy” Source 51.03 g 11.412 221107
22110701		 Dec 7, 2022 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
SRS-10-003 Cf-252 “Dummy” Source



Dec 19, 2022 (mBq/kg) 2.08 +- 1.70 <42.61

<0.61

9.59 +- 2.22 <40.49

<8.46

2.68 +- 1.47






(ppb or ppm) 0.17 ppb +- 0.14 ppb <3.45 ppb

<1.07 ppb

2.36 ppb +- 0.55 ppb <1.31 ppm















Results: 210Pb:
7Be:

54Mn:

228Ac:

57Co

58Co












(mBq/kg) <537.50

<9.77

<1.82

10.03 +- 3.52 <1.07

<2.86











(ppb or ppm) <43.54 ppb







2.47 ppb +- 0.87 ppb









In Progress and To Be Measured:




























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






















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:


















(mBq/kg)



























(ppb or ppm)