By Herman Cember, Thomas E. Johnson
A dynamic, all-inclusive review of the sphere of future health physics
A Doody's center identify for 2011!
If it really is a massive subject within the box of wellbeing and fitness physics, you can find it during this depended on textual content . . . in sections on actual ideas, atomic and nuclear constitution, radioactivity, organic results of radiation, and instrumentation. This extraordinary consultant spans the total scope of the sphere and provides a problem-solving procedure that would serve you all through your career.
- a radical review of need-to-know subject matters, from a assessment of actual rules to an invaluable examine the interplay of radiation with topic
- More than 380 "Homework difficulties" and a hundred seventy five+ "Example difficulties"
- crucial heritage fabric on quantitative hazard evaluation for radiation publicity
- Authoritative radiation defense and environmental wellbeing and fitness assurance that helps the foreign fee on Radiological Protection's criteria for particular populations
- High-yield appendices to extend your comprehension of bankruptcy fabric
- NEW! crucial assurance of non-ionizing radiation, lasers and microwaves, laptop use in dose calculation, and dose restrict recommendations
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Extra info for Introduction to Health Physics
Solution The work done is, from Eq. 4 × 10−6 C × 5 × 10−6 C − 2 C 1m 2m = 1 N · m = 1 J. In this example, 1 J of energy was expended in moving the 5 μC of charge from a to b . The work per unit charge is W J 1J = 200, 000 = −6 q C 5 × 10 C 18 CHAPTER 2 We therefore say that the potential difference between points a and b is 200,000 V, since, by deﬁnition: One volt of potential difference exists between any two points in an electric ﬁeld if one joule of energy is expended in moving a charge of one coulomb between the two points.
The magnitude of the force, therefore, increases rapidly as the charge q approaches Q, and increasingly greater amounts of work are done when the exploring charge q is moved a unit distance. The movement of the exploring charge may be accomplished by a series of inﬁnitesimally small movements, during each of which an inﬁnitesimally small amount of work is done. The total energy expenditure, or increase in potential energy of the exploring charge, is then merely equal to the sum of all the inﬁnitesimal increments of work.
The electromagnetic spectrum. 38 CHAPTER 2 Generally, the speed of an electromagnetic wave in any medium depends on the electrical and magnetic properties of that medium: on the permittivity and the permeability. The speed is given by v= 1 . 58) In free space, N A 1 μ = μ0 = 4π × 10−7 ∈ = ∈0 = 4π × 9 × 109 N · m2 C2 . Substituting the values above into Eq. 58) gives the speed c of an electromagnetic wave in free space: ⎛ ⎞1/2 2 9 N·m ⎜ 4π × 9 × 10 C2 ⎟ ⎟ = 3 × 108 m . v=c =⎜ ⎝ ⎠ N −7 s 4π × 10 A2 An electromagnetic wave travels more slowly through a medium than through free space.
Introduction to Health Physics by Herman Cember, Thomas E. Johnson