By Alan Martin, Sam Harbison, Karen Beach, Peter Cole
A brand new version of the UK's normal creation to the dangers offered by way of ionizing radiation and the tools of safeguard and control.
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Additional info for An Introduction to Radiation Protection 6E
For doses above about 10 Gy, survival time drops abruptly to between 3 and 5 days. It remains at about this ﬁgure until much higher doses are reached. In this region, the radiation dose causes severe depletion of the cells lining the intestine. Gross damage occurs in the lining of the intestine, followed by severe bacterial invasion. This is called the region of gastrointestinal death. At much higher doses, survival times become progressively shorter. There are very few human data in this region, but from animal experiments the symptoms indicate some damage to the central nervous system and hence the region is called the region of central nervous system death.
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. Late effects: effects occurring at later times, typically some years after exposure; main effect is cancer induction.
Some of these radioisotopes, particularly 14C, can be absorbed by plant life and subsequently cycled into the whole food chain. 3 RADIATION FROM TERRESTRIAL SOURCES The rocks and soil of the Earth’s strata contain small quantities of the radioactive elements uranium and thorium and their daughter products. The concentration of these elements varies considerably depending on the type of rock formation. In sandstone and limestone regions the concentration is much lower than in granite. Thus the dose rate depends on the geographic location.
An Introduction to Radiation Protection 6E by Alan Martin, Sam Harbison, Karen Beach, Peter Cole