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Environmental
Restoration ERC Team
Contractor 1>.D. WA
CCN: 055088
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Interoffice Memorandum a' ^'' w° iWA w^ ran ^
S C
SMw•CoA 11!0
TO: D. A. St. John LO-19 °ATE: I ebnwy 27. 1999
Scc Bclow MO.% S. L. Winsl ow
RadCuu Engine ering
X3-41/531-0706
suuecT: CURIF. ESTIMATE FOR SJUPPINCCONCRETFE, CORE SAMPLES
The following calculation simw that core sampleswith a direct reading of equal to or less IlLin
400.000 dpm/1 00cm'will be below the definition ofradivactive material as de fi ned in 49 CFR 173.40;
of 70 Bq/g (2F3 pCl/g). Lach sample will consistofeoncrete mate rial from flour, two inch core
samples and enough water to make a slurry consisrncy. 'fhe distrihutiun of radionuclides is hased ern
previous concrete samples taken front the below gmdt! Fuel Storage Basin that would also be
represcniative of these cunercic samples.
'iven:
Cylinder Volume = nih Radius of co acte core (r) = I inch
Concrete Density = 1 35 g/cm' height of care sample taken (h) - 0.25 inches
27 pC; i =13q Maximum Jana reading on core = 400,000 dprni i UUcni'
2?2 dpm = pCi
Calculations
V — (3.14) (I in.)'(U._5in) = 0.78 in' (16.4 ctrl'/in^ (4 care santplcs) = 51? cm
(400.000 dpni/5 L2 cm') (cm'2.35 g) = 3.32E3 dim/g
3.32L3 dpin"l; (pCi2 2 dpm) = 1.5E3 pCi/g or 55.4 Bq/g
SINAld
Percent Distribution(%) Conceatration (VOW,
nCo 0.17 2.55 pCi/g
"'Cs 82 1.2F.3 pCilg
'''lEu 0.33 4.95 pCi/g
"'Eu 0.05 7.5E-1 pC ilg
°"Sr 1 7 2.55E2 pCi/g
SA'Atn 0.005 7.5E-Z pCi/g
'39n 'Pu 0.1 1 5 nCU
Co ics:
S. G. lvlarske X5-53
P. A. Newnlatt X:>-4 1
RadCon Enginee ri ng FildlLB X0-23
Document and Into Services 110- 0 1)
TU'fAL_ 1.46U3 pCi/g
61 115