Download PDF by Alan Martin, Sam Harbison, Karen Beach, Peter Cole: An Introduction to Radiation Protection 6E

By Alan Martin, Sam Harbison, Karen Beach, Peter Cole

ISBN-10: 1444146076

ISBN-13: 9781444146073

ISBN-10: 1444146084

ISBN-13: 9781444146080

A brand new version of the UK's average creation to the dangers offered via ionizing radiation and the equipment of safeguard and control.

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Extra info for An Introduction to Radiation Protection 6E

Sample text

Components of cell: nucleus, cytoplasm and outer membrane. Nucleus contains chromosomes, which are thread-like structures made up of genes. Genes carry the information which determines the characteristics of daughter cells. Mitosis: the process by which single cells reproduce. Meiosis: a stage in the formation of the reproductive cells – the sperm in the male and the ovum in the female. Effects of radiation on cells: inhibition of mitosis, chromosome aberrations. Acute effects: effects occurring within a few weeks of a very large exposure; owing to the depletion of cell populations.

Cells are able to reproduce in order to compensate for cells that die. The life of different types of human cells, and hence the rate of reproduction, varies from a few hours to many years. Reproduction of cells occurs in two ways, known as mitosis and meiosis. The mitotic cells are the ordinary cells in the body and in mitosis the chromosomes duplicate by splitting lengthways. The original cell then divides into two new cells, each identical to the original. Meiosis is a special kind of division which occurs during the formation of the sexual reproduction cells, namely the sperm in the male and the ovum in the female.

Thus the child receives two complementary sets of genes, one from each of its parents. In general, it is found that one gene is ‘dominant’ and the other is ‘recessive’. The dominant gene determines the particular characteristic with which it is associated. Recessive genes are only recognized when, by chance, two of the recessive-type genes come together. A considerable number of diseases are associated with recessive genes and will therefore manifest themselves only when both parents have the same recessive genes.

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An Introduction to Radiation Protection 6E by Alan Martin, Sam Harbison, Karen Beach, Peter Cole


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