Hence, the calculation for 241 Am content and total TRU follow:
Bulk soil = (1.2 x 106 em3)(1.5 g/em3)(2300 pCi/g)
= 4.2 mCi
"Hot" bags =(1000 g/bagX3 bags)(2.3 x 105 pCi/g)
= 0.7 mCi
Jars = 92uCi
0.1 mCi
Concrete chunk = 260uCi
0.3 mCi
241 Am Sum
5.3 mCi
239,240 py (10 x 24l am)
53 mCi
Total TRU
60 mCi
Recommendations
Since the total contained radioactivity in the bunker is small relative to the TRU already deposited
in the Cactus Crater and is a small volume (approximately 2 cubic yards total), it is reeommended
that the radioactive debris stored in the bunker be removed and disposed of in the Cactus Crater
dome.
This includes all of the remaining bags, loose sand and soil, and the metal cans, jars and
wooden box. These items should all be treated as being alpha contaminated and disposed of in the
most expeditious manner.
TABLE B-14-1. RESULTS OF FIELD GROSS GAMMA ANALYSIS OF SELECTED
SAMPLES IN YVONNE STORAGE BUNKER
241 am
Sample No.
pCi/g or ECi*
Comments
1
1300
Composite of loose soil at rear of bunker
3
4
340
2200
Composite of torn bags
Composite of loose soil near center of pile
6
7
Jar 1
Jar 2
Concrete
1100
580
2
3
420
Composite of torn bags
5200
Soil from torn bag #181
14
78
260
Soil from torn bag near entrance
Sand/soil from floor near entrance
Weathered metal part
Flaked gray metal with soil
Concrete chunk with bluish gray metal in
*Petri sample data (pCi/g) based on measurements at approximately 10 em from detector. Discrete
source data (-Ci) based on measurements at 1m from detector. Calibration data follows: (1) Net
epm with PG-2 at 3, 4 and 5 inches from a 31,600 dpm 24l4m soil standard were 48, 23 and 14,
respectively (approximate background of 30 epm, 1.6 x 10-8 epm/pCi at 4 inches); (2) Net epm
with PG-2 at 1 meter from 0.52HCi 241 4m plated source was 30(58 epm/uCi).
B-14-3
Te
center