Microscope

1
Microscope

• A cut away of a 500 mR Dosimeter

View through eyepiece
Ionization Chamber (pink area)
500 mR GAMMA X-RAY DOSIMETER 883
Quartz Fiber Electrometer
Insulating Charging Pin
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Pocket DosimetersHow do they work?

• They are zeroed with a dosimeter charger at the
  Insulating Charging Pin. This device puts a
  positive charge on the Quartz Fiber Electrometer.
  This charge pushes the Quartz Fiber away from
  the Electrometer.
• As the Ionization Chamber is exposed to Gamma or
  X-rays, negative ions are attracted to the
  positively charged Electrometer. This attaction
  bleeds off the Electrometer charge, causing the
  Quartz Fiber to move toward the Electometer.
• A meter scale is located after the front lens of
  the Microscope. When viewed through the
  eyepiece, the meter scale and Quartz Fiber appear
  as one and indicate the exposure.
• The meter indication will continue to increase
  until the positive charge is removed from the
  Electometer, at which time the dosimeter must be
  rezeroed.