http://iet.metastore.ingenta.com
1887

Radiation sensors and actuators

Radiation sensors and actuators

For access to this article, please select a purchase option:

Buy chapter PDF
$16.00
(plus tax if applicable)
Buy Knowledge Pack
10 chapters for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
Sensors, Actuators, and Their Interfaces: A multidisciplinary introduction — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

The modern world has an almost innate fear of nuclear radiation. It may be the heritage of Hiroshima and Nagasaki or it may be that we just fear the unknown, the invisible, and of course there are some very good reasons to be careful. Nuclear radiation can cause damage to cells and in high doses is known to cause cancer or even death. However, radiation comes in many shades and forms. All electromagnetic waves fall in the same general category of radiation, the difference being only in frequency (and with it in energy). If one were to imagine an instrument with a dial that can change the frequency from zero to infmity, then as the frequency would rise, it would first generate low-frequency fields, first in the audio range, then into ultrasonics, then above about 200 kHz, into what colloquially is called radio waves. Further up, the instrument will pass through very high frequency (VHF), ultra-high frequency (UHF), and then into the microwave region. Beyond that lies millimeter waves and then infrared (IR) radiation, followed by visible light and ultraviolet (UV), then into X-rays, α, β, and γ rays, and further up into cosmic rays. As the frequency increases, the energy associated with the waves increases, and the radiation effects become more pronounced. As is generally known, UV and X-rays are harmful radiation and are part of the cumulative effect of radiation in our lives and health. It is expected that people working with X-rays will naturally be exposed to more radiation than those who may only have a scan in a lifetime. Pilots and frequent fliers will necessarily be affected by cosmic rays as are astronauts in space. But beyond these, there is a background radiation level more or less constant over the globe. It is a low-level radiation caused by radioactive isotopes in rocks and soils of the order of 20-50 becquerel/minute (Bq/min) that can be detected with Geiger counters. This radiation is of no consequence to health, as it is too low to do any damage. The exposure level is, on an average, about 2.4 millisievert/year (mSv/yr). But there are locations and conditions in which the background radiation can be higher and of more concern. Granite rocks and hot springs tend to have higher radiation levels, and certain areas around the globe have naturally occurring high radiation levels as high as 250 mSv/yr or higher. On the other hand, sedimentary rocks and limestone have lower levels. Underground locations, including quarries, mines, or even basements, can have higher levels primarily from radon (a decomposition by-product of naturally occurring uranium and its isotopes), and radon can be found in the atmosphere as well as in water. However, beyond reasonable caution, it should be remembered that these are natural sources that have been there from time immemorial and will be with us for any imaginable future.

Chapter Contents:

  • 9.1 Introduction
  • 9.2 Units of radiation
  • 9.3 Radiation sensors
  • 9.3.1 Ionization sensors (detectors)
  • 9.3.1.1 Ionization chambers
  • 9.3.1.2 Proportional chamber
  • 9.3.1.3 Geiger–Muller counters
  • 9.3.2 Scintillation sensors
  • 9.3.3 Semiconductor radiation detectors
  • 9.3.3.1 Bulk semiconductor radiation sensor
  • 9.3.3.2 Semiconducting junction radiation sensors
  • 9.4 Microwave radiation
  • 9.4.1 Microwave sensors
  • 9.4.1.1 Radar
  • 9.4.1.2 Reflection and transmission sensors
  • 9.4.1.3 Resonant microwave sensors
  • 9.4.1.4 Propagation effects and sensing
  • 9.5 Antennas as sensors and actuators
  • 9.5.1 General relations
  • 9.5.2 Antennas as sensing elements
  • 9.5.2.1 Triangulation, multilateration, and the global positioning system
  • 9.5.3 Antennas as actuators
  • 9.6 Problems

Inspec keywords: gamma-ray detection; alpha-particle detection; beta-ray detection

Other keywords: beta-rays; Geiger counters; cosmic rays; X-rays; microwave region; granite rocks; alpha-rays; very high frequency; radiation sensors; limestone; radioactive isotopes; electromagnetic waves; gamma-rays; sedimentary rocks; ultra-high frequency; radio waves; nuclear radiation

Subjects: Particle and radiation detection and measurement; Radiation measurement, detection and counting

Preview this chapter:
Zoom in
Zoomout

Radiation sensors and actuators, Page 1 of 2

| /docserver/preview/fulltext/books/ce/pbce127e/PBCE127E_ch9-1.gif /docserver/preview/fulltext/books/ce/pbce127e/PBCE127E_ch9-2.gif

Related content

content/books/10.1049/pbce127e_ch9
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address