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Table T2. X-ray CT scanner standards. (See table notes.)

Date Local time
(h)		 CT number
Air Air SD Water Water SD Aluminum Aluminum SD
29 Nov 2007 0025 — — –1.32 10.30 2476.58 75.93
30 Nov 2007 0140 — — 1.47 13.27 2487.36 72.51
1 Dec 2007 0035 — — –1.51 12.85 2474.02 60.63
2 Dec 2007 0120 — — –0.91 12.95 2485.93 72.16
3 Dec 2007 0045 –1006.97 7.18 –1.80 14.68 2464.83 58.96
3 Dec 2007 0411 –1005.18 9.18 –0.56 15.40 2464.34 59.91
4 Dec 2007 0044 –1006.01 7.85 –0.95 13.96 2480.22 68.76
5 Dec 2007 0115 –1006.34 8.03 –2.45 12.59 2457.37 58.27
6 Dec 2007 0035 –1005.99 8.53 –2.43 12.61 2471.55 73.09
6 Dec 2007 2230 –1006.28 7.65 –1.10 14.81 2416.43 66.24
7 Dec 2007 2355 –1006.55 7.32 0.97 13.43 2482.68 51.00
8 Dec 2007 2230 –1006.37 7.98 1.32 13.94 2473.31 65.17
8 Dec 2007 2305 –1006.42 9.45 0.78 12.11 2477.33 60.64
9 Dec 2007 2330 –1007.67 9.42 –1.89 11.27 2477.90 64.79
11 Dec 2007 0530 –1003.81 7.97 2.94 13.27 2471.29 71.91
12 Dec 2007 0330 –1002.25 8.29 1.56 13.36 2480.52 67.64
13 Dec 2007 0025 –1004.16 9.98 2.43 15.73 2471.53 65.62
14 Dec 2007 0150 –1006.17 7.93 1.17 14.30 2469.05 57.42
14 Dec 2007 2127 –1004.81 8.18 5.95 10.35 2464.15 61.73
15 Dec 2007 0220 –1002.44 8.08 3.32 12.82 2488.04 58.74
16 Dec 2007 0305 –1003.41 7.30 3.30 13.98 2466.78 63.24
17 Dec 2007 0320 –1003.48 7.62 2.30 12.85 2483.48 57.90
17 Dec 2007 1905 –1005.27 8.61 0.16 13.91 2486.22 62.75
17 Dec 2007 2233 –1003.26 7.73 5.28 11.65 2484.65 57.73
19 Dec 2007 0105 –1004.91 7.93 2.40 14.53 2473.45 65.36
19 Dec 2007 2240 –1004.20 8.40 2.72 12.82 2491.59 56.61
20 Dec 2007 2125 –1003.65 8.36 –0.62 14.58 2471.07 67.74
22 Dec 2007 0450 –1003.09 8.51 3.43 14.18 2482.15 73.99
23 Dec 2007 0015 –1004.15 7.30 0.57 12.96 2486.75 71.53
23 Dec 2007 2343 –1003.98 9.30 3.85 12.12 2480.02 55.38
24 Dec 2007 2320 –1002.94 7.56 –0.55 13.03 2471.83 60.78
26 Dec 2007 0139 –1004.18 8.01 2.95 12.40 2469.37 63.02
27 Dec 2007 0032 –1003.12 7.30 3.10 12.36 2491.96 74.09
28 Dec 2007 0045 –1003.02 9.37 2.94 14.07 2482.29 51.89
29 Dec 2007 1230 –1003.47 8.30 3.88 12.70 2474.84 61.07
30 Dec 2007 0627 –1003.45 8.62 1.20 13.74 2477.12 64.19
31 Dec 2007 1217 –1003.82 8.46 4.21 14.96 2479.53 65.73
1 Jan 2008 1054 –1003.95 8.11 3.44 13.22 2473.77 64.81
2 Jan 2008 0139 –1003.07 8.56 2.58 14.07 2478.18 61.81
3 Jan 2008 0037 –1003.87 9.90 2.72 14.48 2476.27 73.87
4 Jan 2008 0100 –1004.11 7.81 4.85 12.83 2479.77 73.58
5 Jan 2008 0230 –1003.29 10.44 3.78 12.07 2499.10 65.39
6 Jan 2008 0100 –1003.10 8.77 0.93 14.27 2490.04 63.26
7 Jan 2008 0200 –1003.88 8.93 3.15 11.91 2488.13 54.52
8 Jan 2008 0300 –1003.44 7.87 4.65 11.50 2481.04 69.99
9 Jan 2008 0124 –1004.66 9.26 2.17 13.84 2493.52 58.56
10 Jan 2008 0155 –1002.89 8.98 4.03 13.05 2478.90 59.86
11 Jan 2008 0226 –1003.08 8.45 3.57 12.13 2474.85 76.48
12 Jan 2008 0458 –1003.14 8.72 2.98 11.89 2478.49 61.49
13 Jan 2008 0100 –1002.43 8.67 5.79 15.66 2481.09 58.77
14 Jan 2008 0045 –1003.57 7.41 4.33 11.58 2478.08 69.03
16 Jan 2008 0405 –1004.73 8.65 3.99 13.35 2490.35 66.63
17 Jan 2008 0400 –1003.95 9.75 3.75 12.73 2482.42 61.65
18 Jan 2008 0031 –1003.11 8.80 3.55 12.76 2479.81 54.10
19 Jan 2008 0022 –1002.96 7.91 3.42 12.63 2467.33 65.76
20 Jan 2008 0230 –1004.15 8.33 4.25 12.88 2477.43 58.90
21 Jan 2008 0112 –1004.76 8.90 5.22 12.03 2475.83 61.85
22 Jan 2008 0238 –1004.38 7.73 2.38 15.35 2474.89 64.25
23 Jan 2008 0037 –1002.22 7.96 2.53 15.50 2486.50 62.49
24 Jan 2008 0112 –1004.52 8.57 1.58 12.55 2482.14 67.98
25 Jan 2008 0105 –1002.53 8.32 7.31 13.70 2478.10 68.51
26 Jan 2008 0225 –1003.77 8.69 3.52 14.62 2487.23 60.25
27 Jan 2008 0340 –1002.89 8.75 5.18 11.67 2474.84 66.95
28 Jan 2008 0340 –1002.44 6.27 0.99 13.17 2487.55 70.33
29 Jan 2008 0358 –1003.50 7.11 4.65 12.85 2483.66 65.14
30 Jan 2008 0115 –1003.30 7.58 2.01 14.99 2480.34 62.72
31 Jan 2008 0122 –1003.21 9.15 0.46 12.59 2483.98 71.88

Notes: SD = standard deviation. — = not determined.

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