Pekka Aalto

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This paper discusses a simple stochastic model for the spread of messages in a large population with two types of individuals: transmitters and receivers. Transmitters, after receiving the message, start spreading copies of the message to their neighbors. Receivers may receive the message, but will never spread it further. We derive approximations of the(More)
Tissue-air ratio (TAR) is the widely used dosimetric parameter for treatment planning in radiation therapy. Comparison of the measured TAR values of 19 60Co therapy units of eight different types was made with the widely used tabulated data of Gupta & Cunningham (1966). The experimental data, and the analysis of the variation in the TAR values caused by(More)
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