Activity Listing for EXO Plastic Samples, activated at MIT 5/30-6/4/2003



Zelimir Djurcic and Andreas Piepke
University of Alabama
(Status 6/27/2003)


We summarize the activities found in the activated samples UA 110, 111, 112, 115, 116, 117 and 118 (UA sample designation NA 14). Samples UA 115 and UA 116 arrived as a mixed powder in a plastic bag. We did not count these two samples. The activities listed refer to 6/3/2003 11:00 (initial counting after receipt of the samples while still in their activation vials). We only list the principal activities as determined by gamma ray spectroscopy using a shielded Ge detector. The listed activities are given in units of [Bq]. The quoted errors were derived by adding the statistical and a 10% systematic error in quadrature. ND means "not detected" (statistically insignificant).

Activity [Bq]
Sample Duration 24Na 42K 46Sc 51Cr 59Fe 60Co 65Zn 82Br 122Sb 140La 182Ta 187W 198Au 233Pa 239Np
UA 110
Machine grade Teflon 		13.047 h 119±12 5.3±0.6 0.7±0.1 15±2 0.9±0.1 3.5±1.0 0.7±0.1 4.4±0.5 13±2 1.3±0.2 2.4±0.3 660±70 3.1±0.4 0.3±0.1 <0.4
UA 111
Virgin Teflon 		13.047 h (3.4±0.34)·104 2570±260 2.3±5.0 30±10 2.5±1.3 ND 39±4 15±8 266±27 6500±650 41±18 (8.4±0.8)·104 46±5 990±100 (1.8±0.2)·104
UA 112
Macrolan (Polycarbonate) 		25.047 h (2.3±0.2)·104 1590±160 17±10 <170 <28 34±9 129±30 333±35 537±60 (1.1±0.1)·104 87±40 (8.9±0.9)·104 321±40 1390±150 (1.0±0.1)·104
UA 117
Blank 		25.047 h (1.8±0.2)·104 1180±120 <11 <86 <86 <7 59±20 <21 301±40 6360±640 41±20 6850±700 60±9 1540±160 (1.9±0.2)·104
UA 118
Flux standard 		0.857 h 666±70 51±6 ND 129±13 ND ND ND 454±46 23±3 ND ND ND ND 2125±220 6900±700
Sample Duration 24Na 42K 46Sc 51Cr 59Fe 60Co 65Zn 82Br 122Sb 140La 182Ta 187W 198Au 233Pa 239Np


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