Transcription of Chapter 4 RADIATION MONITORING INSTRUMENTS
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101 Chapter 4 RADIATION MONITORING INSTRUMENTSG. R AJA NMedical Physics and Safety Section,Bhabha Atomic Research Centre,Mumbai, Maharashtra, IndiaJ. I Z E W S K ADivision of Human Health,International Atomic Energy Agency,Vienna INTRODUCTIONR adiation exposure to humans can be broadly classified as internal and external exposure. Sealed sources, which are unlikely to cause internal exposure, are used almost exclusively in radiotherapy. This Chapter deals with the MONITORING of external exposures. External exposure MONITORING refers to measuring: RADIATION levels in and around work areas; RADIATION levels around radiotherapy equipment or source containers; Equivalent doses received by individuals working with RADIATION .
detectors or solid state detectors (e.g. scintillator or semiconductor detectors). A gas filled detector is usually cylindrical in shape, with an outer wall and a central electrode well insulated from each other. The wall is usually made of tissue equivalent material for ionization chamber detectors and of brass or copper for other types of ...
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