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
Background runs for the Well Detector
If a measurement in the signal region is below the sideband regions then the 90% confidence limit is calculated.
Sample Description Manufacturer Mass (g) Live Time (days) Run Numbers Counting Dates
(if applicable)


238U from 226Ra

238U from 234Th

235U

232Th

228Ac

137Cs

210Pb
Comments
Background CW1

38.281 121121
121123
121130
121229
Nov 21, 2012 (mBq) 0.153 +/- 0.053 0.100 +- 0.071 0.345 +- 0.065 0.216 +/- 0.097 0.073 +/- 0.278 <0.269

0.151 +/- 0.276


Completely Empty Detector


Dec 31, 2012


















1.98
13.13


Background CW2

23.184 130328
130330
130406
130419
Mar 28, 2013 (mBq) 0.225 +/- 0.063 0.020 +- 0.089 0.227 +- 0.066 0.308 +/- 0.098 0.759 +/- 0.378 0.700 +/- 0.700 0.195 +/- 0.332


Completely Empty Detector



Apr 22, 2013


















1.77
9.07


Background CW3

10.681 130722
130727
130730
130802
Jul 22, 2013 (mBq) 0.187 +/- 0.078 0.058 +- 0.196 0.116 +- 0.038 0.218 +/- 0.099 <0.518

<1.508

<0.172


Completely Empty Detector



Aug 13, 2013


















0.00
33.80


Background CW4

14.158 130929
131111
13111101
Oct 29, 2013 (mBq) 0.080 +- 0.078 0.100 +- 0.089 0.065 +- 0.032 0.028 +- 0.099 <0.201

<1.195

<0.391


Completely Empty Detector



Nov 13, 2013


















0
6.54


Background CW5

6.721 140814
Aug 18, 2014 (mBq) 0.080 +/- 0.083 <0.206

0.012 +- 0.086 <0.250

0.186 +- 0.759 <3.159

1.500 +- 0.700
Completely Empty Detector



Aug 25, 2014


















3.06
2.04


Background CW6

44.129 141215
150107
150116
15011601
Dec 15, 2014 (mBq) 0.178 +- 0.039 0.100 +- 0.059 0.051 +- 0.018 0.164 +- 0.054 0.230 +- 0.245 <0.23

0.921 +- 0.210
Completely Empty Detector



Jan 29, 2015


















20.88
22.68


Background CW7

12.386 150224
150227
15022701
050301
150308
150309
Feb 24, 2015 (mBq) 0.132 +- 0.070 <0.100

0.012 +- 0.033 0.379 +- 0.099 <0.364

<2.19

0.65 +- 0.37
Completely Empty Detector


Mar 10, 2015


















4.75
7.30


Background CW8

25.147 151218
151219
15121901
151224
151231
15123101
160101
Dec 18, 2015 (mBq) 0.209 +- 0.055 <0.011

<0.021

0.294 +- 0.078 0.838 +- 0.361 <0.735

0.62 +- 0.29
Completely Empty Detector



Jan 13, 2016


















7.37
11.89


Background CW9

25.098 160608
160819
160828
16062801
Jun 8, 2016 (mBq) 0.162 +- 0.051 0.011 +- 0.073 <0.008

0.314 +- 0.082 <0.280

0.69 +- 0.84 0.74 +- 0.25
Completely Empty Detector



Jul 7, 2016


















11.84
16.00


Background CW10

52.569 161202
161213
161215
161229
170111
Dec 2, 2016 (mBq) 0.123 +- 0.035 0.030 +- 0.051 0.044 +- 0.015 0.211 +- 0.054 0.092 +- 0.220 <0.187

0.47 +- 0.18
Completely Empty Detector


Jan 25, 2017


















14.51
30.86








Additional Backgrounds:
7Be:

54Mn:
























(mBq) <0.198


2.50 +- 2.64

















Background CW11

20.398 180925
180930
181005
181008
Sep 25, 2018 (mBq) 0.172 +- 0.058 0.097 +- 0.092 0.035 +- 0.025 0.188 +- 0.082 0.189 +- 0.331 <1.33

1.38 +- 0.43
Completely Empty Detector


Oct 17, 2018






























Additional Backgrounds:
7Be:

54Mn:
























(mBq) 1.34 +- 1.73 <4.61



















Background CW12

10.726 181102 Nov 2, 2018 (mBq) 0.077 +- 0.080 0.241 +- 0.126 <0.022

0.12 +- 0.11 0.71 +- 0.56 <1.72

0.84 +- 0.56
Completely Empty Detector



Nov 13, 2018






























Additional Backgrounds:
7Be:

54Mn:
























(mBq) <0.34

<12.86



















Background CW13

53.002 200324
200430
Mar 24, 2020 (mBq) 1.105 +- 0.145 0.128 +- 0.075 0.024 +- 0.009 0.346 +- 0.067 0.46 +- 0.19 <0.57

0.42 +- 0.20
Completely Empty Detector



May 19, 2020






























Additional Backgrounds:
7Be:

54Mn:
























(mBq) 1.63 +- 1.08 0.00 +- 0.67

















Background CW14

40.956 200811
20081101
Aug 11, 2020 (mBq) 0.168 +- 0.104 0.136 +- 0.749 <0.011

0.208 +- 0.067 0.19 +- 0.18 <0.87

0.44 +- 0.20
Completely Empty Detector



Sep 2, 2020






























Additional Backgrounds:
7Be:

54Mn:

60Co




















(mBq) <0.75

<1.22

1.07 +- 2.15














Combined Background Combined Backgrounds of runs CW1, CW2, CW3, CW4, CW5, CW6, CW7, CW8, CW9, CW10, CW11 & CW12
283.566

(mBq) 0.230 +- 0.040 0.044 +- 0.027 0.023 +- 0.008 0.75 +- 0.22 0.25 +- 0.11 <0.024

0.221 +- 0.072


Completely Empty Detector

































Additional Backgrounds:
7Be:

54Mn:
























(mBq) <0.54 .
0.79 +- 0.97

















Background CW15 This is the first background run with the Fast Discriminator set to Low Energy N/A 33.032 210322
210405
Mar 22, 2021 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Completely Empty Detector


Apr 26, 2021 (mBq) 0.259 +- 0.031 0.515 +- 0.159 0.0074 +- 0.0057 0.204 +- 0.029 4.16 +- 1.12 0.043 +- 0.028 0.225 +- 0.063

RT: 18.4 uSec
FT: 1.2 uSec
Pole Zero: 2048


































Results: 210Pb:
7Be:

54Mn

228Ac:
















(Mbq) <1.01

<0.17

0.031 +- 0.036 0.295 +- 0.080










































Background CW16 This is the second background run with the Fast Discriminator set to Low Energy N/A 40.479 210729
21080501
210812
21081201
Jul 29, 2021 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Completely Empty Detector

210823
210901
21090101
Sep 10, 2021 (mBq) 0.022 +- 0.022 1.634 +- 0.249 <0.0046

0.050 +- 0.022 0.80 +- 1.44 0.033 +- 0.025 0.094 +- 0.058

RT: 18.4 uSec
FT: 1.2 uSec
Pole Zero: 2048


































Results: 210Pb:
7Be:

54Mn

228Ac:
















(Mbq) <2.21

<0.30

<0.032

0.097 +- 0.065










































Background CW17 This is the third background run with the Fast Discriminator set to Low Energy N/A 20.798 220114 Jan 14, 2022 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Completely Empty Detector


Feb 4, 2022 (mBq) 0.114 +- 0.033 <0.37

0.0124 +- 0.0075 0.119 +- 0.033 3.89 +- 1.50 <0.068

0.206 +- 0.077

RT: 18.4 uSec
FT: 1.2 uSec
Pole Zero: 2048


































Results: 210Pb:
7Be:

54Mn

228Ac:
















(Mbq) <1.31

0.06 +- 0.17 0.066 +- 0.047 0.417 +- 0.093










































Background CW18 This is the forth background run with the Fast Discriminator set to Low Energy N/A 103.809 220805
220807
220809
220811
220813

Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Completely Empty Detector

220815
22081501

(mBq) 0.123 +- 0.016 0.243 +- 0.079 0.0044 +- 0.0034 0.195 +- 0.017 7.56 +- 0.92 <0.023

0.133 +- 0.030

RT: 18.4 uSec
FT: 1.2 uSec
Pole Zero: 2048


220816
220817
220825
220906





























220919
22091901
220920

Results: 210Pb:
7Be:

54Mn

228Ac:














221014
221021
221024
221025
22102701

(Mbq) <0.55

<0.15

<0.033

0.229 +- 0.043















22110401
221219
230117


























Background CW19
N/A 63.332 230419
230613
230614
230620

Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Completely Empty Detector



(mBq) 0.153 +- 0.021 0.154 +- 0.104 0.0076 +- 0.0048 0.204 +- 0.023 6.88 +- 1.13 0.031 +- 0.026 0.171 +- 0.042




































Results: 210Pb:
7Be:

54Mn

228Ac:
















(Mbq) <0.65

0.23 +- 0.11 <0.041

0.228 +- 0.058










































Background Runs In Progress:




























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























Background CW20
N/A 35.57 230916
23091801
230927
230929
23092901
Sep 16, 2023 Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments
Completely Empty Detector

230930
23093001
231001
231003
23100401
Oct 26, 2023 (mBq) 0.166 +- 0.027 0.194 +- 0.131 0.0082 +- 0.0060 0.195 +- 0.028 6.03 +- 1.35 0.069 +- 0.031 0.090 +- 0.050




231008
231012
231014
231018
23101801





























231023
231024
23102401
231025

Results: 210Pb:
7Be:

54Mn

228Ac:
















(Mbq) <1.19

0.10 +- 0.14 0.023 +- 0.036 0.248 +- 0.074










































Next




Results:
238U from 226Ra

238U from 234Th

235U

232Th

40K

137Cs

60Co
Comments






(mBq/kg)



























(ppm / ppb / ppt)




























Results: 210Pb:
7Be:

54Mn

228Ac:
















(mBq/kg)





























(ppm / ppb / ppt)