Calculation Sheet For Safe Distances 1/3 0.20 inch 5.08 mm Source Ativity 25.00 Curie Source intensity (Io) 12.00 Rem/hr 1.00 meter 304.8 mm Shield Thickness (t) 0.00 inch 25.4 mm 3.00 Rem/hr 2.00 Meter 2000 mm 3.00 Rem/hr 1.00 Feet 304.8 mm ### Rem/hr 63.25 Feet 1.93E+04 mm ### Rem/hr 244.95 Feet 7.47E+04 mm Governing Equations 1) Invers Square Formula 2) H.V.L Calculations Half value layer (Lead)(τ) Do I1 D1 I2 D2 I3 D3 I4 D4 I 1 I 2 = D 2 2 D 1 2 I t =I 0 ( 1 2 ) t τ Io Do I1 D1 I2 D2 I3 D3 I4 D4 Safe Distance (involved person) Sa ( Source Shield

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Sheet1Half value layer (Lead)()0.20inch5.08mmSource Ativity25.00CurieSource intensity (Io)12.00Rem/hrDo1.00meter304.8mmShield Thickness (t)0.00inch25.4mmI13.00Rem/hrD12.00Meter2000mmI23.00Rem/hrD21.00Feet304.8mmI37.5E-04Rem/hrD363.25Feet1.93E+04mmI45.0E-05Rem/hrD4244.95Feet7.47E+04mmGoverning Equations1) Invers Square Formula2) H.V.L Calculations

&C&"Times New Roman,Bold"&14&UCalculation Sheet For Safe Distances&C&P/&NIoDoI1D1I2D2I3D3I4D4Safe Distance (involved person)Safe Distance (noninvolved person)SourceShield

Sheet2REMSV2.5E-032.5E-0511.0E-022.00E+002.00E-024.00E+037.500E-03

Sheet3

MBD0002BA63.unknown

MBD0002BA64.unknown