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Environmental
Restoration ERC ream
Contractor
Interoffice Memorandum
TO'' D. A. St. John LO-19 arc
nrua'
5).W:dld
Set; Below Fa"`
Percent DistrihutionM
°Co 0.17
(IT C." 82
132 E 0.33
'"Eu 0.05
A7Sr 17
'"'Ain 0.005
'''"'"'Pu 0.1
TDTAL:
T_ -^7n
l-ebruary 27.1998
S. L. Winslow
RadCun Engiw:cring
X341/531-0706
sualacr: CVRIK FSTIMATE FOR Stl1PP1N000NCUTF. CORE SAMPLES
Job No. 22172
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CCN- 055088
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The IbIlowing calculations show that con; sampltswith a direct reading of equal to or less than
400.000 dpm/100cm' will be below the definition of riftwctive material as defined in 49 CFR 173.40-,
of 70 By/g (2F3 901g). Lach sample will consist ofcoacrctc material from four. two inch co re
samples and enough water to make a slurry consisxncy. '11w distribution of radionuclides is based on
previous concrete samples taken front the below Vade Fuel Sloragc Basin that would also he
representative of these cuncretc samples.
(jiven:
Cylinder Volume = nrh Radius of concrete core (r) = I inch
Concrete Density = 2.35 gJcm' height of core sample taken (h) - 0.25 inches
27 pCi = Bq Maximum &vet reading on con = 400,000 dpm/lUucalt
2.22 dpm = pCi
Calculations:
V-(3.14)(1 in.) `(025in) = 0.78 in' (16.4cm `/inj(4 van: samples) = 512 Lm'
(400.000 dpm/5 L2 cm) (cm/2.35 g) = 3.32E3 dpm/g
3.321:3 dpm/g (pCi/2.2 dpm) = 1.5E3 pCi/g or 55.4 kg
C(Mics:
S. (. Marskc X5-53
P. A. Newman X3-41
RadCun Engineering He!LB XO-23
Document and info Services 130-09
Cona mtration (uC:V0
2.55 pCiig
1.2F3 pCi/g
4.95 pCiig
7.5E-1 pCilg
2.55E2 pCi/g
7.5F.-Z pCi/g
1.5 OCUZ
1.460 pCi/g
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0103