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Environmental
Restoration ERC Team
Contractor
Interoffice Memorandum
TO' D. A. St. John I.0-19 LATE: l-ebruary 27. 1998
"O''' F'` ' See 13clow
FROM:
* Av
S. L. Winslow
RadCon Enginuing
X3-41/531-0706
suwECT: CURIE ESTIMATE FOR SHIPPING CONCRETE CORE SAMPLES
Concentration_(^Ci/;>
2.55 pCi/g
I.2F.3 pCi/g
4.95 pCi/g
7.5E-1 pCi/g
2.55E2 pCi/g
7.5F.-2 pCi/g
1.5 2C.Ug
1.46E3 pCiig
Job No. 22172
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The ibllowing calculations show that core samples with a direct reading of equal to or less than
400,000 dpm/100cm' will be below the definition of radioactive mate rial as defined in 49 CFR 173.40±
of 70 Bq/g (2F3 pCi/g). Lach sample will consist of concrete materi al from [our. two inch core
samples and enough water to make a slurry consistency. 'fhe dislrihution cdmdionuclides is based on
previous concrete samples taken front the below grade Fuel Stora ge Bas in that would also be
representative of these com:rctc samples.
'ven:
Cylinder Volume = nr'h Radius of concrete core (r) = I inch
Concrete Density = 2 3 5 ylem' Ileight of care sample taken (h) - 0.25 inches
27 pCi = Bq Maximum direct reading on :ore = 400.00 0 dpnl/lUUcn1`
2.22 dpm = pCi
Calculations:
V - (3.14) (1 in.) 2( 0.25in) = 0.78 in' (16.4 can `/in) (4 cure samples) = 51.2 cm'
(400.000 dpm/51.2 cm) (cm'2.35 g) = 3.32E3 dpm/g
3.3213 dpnn'g (pCi/2.2 dpm) = 1.5E3 pC'i/g or 55.4 Bq/g
SI VAld
Percent Distribution( 7o )
'"Co 0.17
"'Cs 82
1 1 Lu 0.33
"°Eu 0.05
"°Sr 17
'°' Arn 0.005
"°'="'Pu 0.1
TOTAL
Copies:
S. 6. Marske X5-53
P. A. Newman X3-41
RadCun Enginee ri ng File/LB XO-23
Document and Info Se rvices 110-09
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