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.
PICO Measurements:




























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






















PICO G01
51.483 g 7.458 240305 Mar 5, 2024 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
PICO Kapton Heater Material



Mar 15, 2024 (mBq/kg) <9.24

<131.20

<3.77

45.30 +- 8.85 377.53 +- 71.26 <5.92

<7.33








(ppb or ppm) <0.75 ppb

<10.63 ppb

<6.64 ppb

11.14 ppb +- 2.18 ppb 12.19 ppm +- 2.3 ppm














Results: 210Pb:
7Be:

54Mn

228Ac:
















(mBq/kg) <313.20

46.15 +- 41.92 <2.52

12.45 +- 12.88

















(ppb or ppm) <25.37 ppb







3.06 ppb +- 3.17 ppb











PICO G02




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)























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:
210Po:














(mBq)





























(ppb or ppm)