Journal of Medical Physics
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Year : 1986  |  Volume : 11  |  Issue : 3  |  Page : 527

Theoretical Calculation For Thermal Test For a Type B Package Containing 10000 Ci Of Cobalt - 60 Teletherapy Source


Correspondence Address:
Amiya Sharma


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A package which is designed to withstand normal conditions of transport is a Typo A package. A Type B package in one which is designed to withstand accident conditions of transport. In order to Demonstrate that a package own indeed withstand accident conditions of transport it has to fulfill certain test requirements. The tests applicable to type B packages include the mechanical test, the thermal test and the water immersion test. The response of the package to the tests can be assessed either by the actual performance of the test on full-scale/reduced scale model or by calculative methods. Here we present the results of our theoretical assessment of the ability of a package intended for the transport of a cobalt-60 teletherapy scarce of strength 10000 Ci to withstand the thermal test. This test requires the operation to be expected to a thermal environment of temperature 800o C fer 30 minutes. First we have studied the temperature distribution in the lead container by solving the best conduction equation. Considering the package to be a sphere, the equation for limar flor with internals surfaces is. The solution of this equation indicates that the temperature inside the container is such more than the melting point of lend. This will lead to thermal expansion of lead cursing stress to develop within the container. This may result in oraoks in the steel encasing. To avoid this, acne wood lining to the package is necessary so that the temperature rise may be controlled. How much wood lining should be provided and what will be the effect of the wood on temparature distribution is also calculated here.


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