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Radiation therapy departments use Cs-137 isotope for cancer treatment. The room walls have concrete to shield the radiation. The half value layer for Cs-137 radiation is 4.8 cm concrete. The concrete wall to reduce the gamma rays to 0.5% of original intensity is _____ cm thick.

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RADIATION DOSIMETRY A THEORY RADIATION DOSES non-SI units (relationship between units) Dose Formula SI units ΔΕ J/kg = Gray (Gy) Absorbed Dose, rad 1 Gy = 100 rad Δm AE is the energy lost from the radiation beam, and Am is the mass of the material into which the energy is absorbed. ΔQ Roentgen (R) 1R = 2,58 · 104 C/kg Exposure dose, C/kg Δm where AQ is the electric charge freed by such radiation in a specified volume of air divided by the mass Am of that air. Relationship between absorbed dose and exposure dose D = f · X D is adsorbed dose , f is a coefficient depending on the kind of tissue being irradiated. H = Q · D where H is dose equivalent, Q is relative biological effectiveness of a particular kind of radiation, D is adsorbed dose. Equivalent Dose, Sievert rem Н (Sv) 1 Sv =100 rem Effective H ΣΗT Sievert rem 1 Sv =100 rem Equivalent Dose , Hef where HT = Wr · H, is the tissue-weighted dose equivalent to an organ or tissue, H, is the dose equivalent to the organ or tissue and the…
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