Download An Introduction to Radiation Protection 6E by Alan Martin, Sam Harbison, Karen Beach, Peter Cole PDF
By Alan Martin, Sam Harbison, Karen Beach, Peter Cole
A brand new version of the UK's normal creation to the risks awarded through ionizing radiation and the equipment of defense and control.
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The simplest approach used to reduce ingress of the radon is by sealing walls and ﬂoors and increasing the ventilation. However, in some cases it may be necessary to ﬁt a ‘radon sump’ to vent the gas into the atmosphere outside the building. A sump has a pipe connecting a space under a solid ﬂoor to the outside, and a small electric fan in the pipe continually sucks the radon from under the building and expels it harmlessly to the atmosphere. org/. 2 Passive Radon Metre. Adapted with kind permission from Report HPA-RRP-001 ‘Ionising Radiation Exposure of the UK Population: 2005 Review’ by S J Watson et al (2005), © Health Protection Agency.
Tissue weighting factor, wT: a factor reflecting the radiosensitivity of a particular tissue or organ. Dose = dose rate ¥ time. Flux from point source = Q/4pr2. 25 26 Radiation units REVISION QUESTIONS 1. 2. 3. 4. 5. What is ionization and how can it be used as a means of measuring radiation? What is a gray? Explain why the sievert is a more suitable unit in health physics than the gray. Explain the concepts of equivalent dose and effective dose. 3 m from a neutron source which emits 3 ¥ 107 n/s.
This high background makes it very difﬁcult to establish whether any additional cases of a particular type of cancer are the result of radiation exposure, even in populations that have been exposed to relatively high levels. At the high doses and dose rates experienced by the groups mentioned earlier, the ICRP has estimated that, averaged over a typical population of all ages, a dose of 1 Sv to each individual would result in a radiation-induced fatal cancer in about 10 per cent of the persons exposed.