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Detector Style
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Your choices are...
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Detector Sensing Element Only
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"Raw" element only, e.g. Scintillation Materials.
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Fixed Installation
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A permanently installed detector.
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Portable Detector
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A transportable detector; can be worn or carried.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Types of Radiation Detectors
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Your choices are...
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Ionization Chamber
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An instrument in which an electric field is applied across a volume of gas. Often its geometry is cylindrical. Electrons become attached to neutral molecules to form negative ions. When an electric field is applied to the gas, the ions drift along the lines of force to produce an ionization current.
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Proportional Counter
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When the electric field strength at the center electrode of a pulse ionization chamber is increased above a certain level, the size of the output pulse from the chamber starts to increase but is still proportional to the initial ionization. A device operated in this way is called a proportional counter. It allows on to detect a very low initial ionization, even down to a single ion pair.
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Geiger-Mueller Counter
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Uses the ionization of a medium as the basic detection process. It consists of a cylindrical metal tube is filled with a gas at low pressure and a long wire along the axis of the tube. When a high energy particle or photon enters the tube through a thin window at one end, some of the atoms of the gas become ionized. An "avalanche" of electrons results in the region of intense electric field near the wire, producing a current pulse at the output of the tube. After the pulse is amplified it can be used to trigger an electronic counter or delivered to a loud speaker, which clicks every time a particle is detected.
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Scintillation Detector
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Usually uses a solid or liquid material whose atoms are easily excited by the incoming radiation. These excited atoms emit visible light when they return to their ground state. Common materials used as scintillators are crystals of sodium iodide and certain plastics. If such a material is attached to one end of a photomultiplier tube the photons emitted by the scintillator can be converted to an electric signal. This pulse can, in turn, be sent to an electronic counter. The scintillator device is much more sensitive than the Geiger Counter, mainly because of the higher density of the detecting medium.
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Semiconductor Diode Detector
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Essentially a reverse-bias-p-n junction. As an energetic particle passes through the junction, electrons are excited into the conducting band and holes are formed in the valence band. The internal electric field sweeps the electrons toward the positive (n) side and the hole toward the negative (p) side. This creates a pulse of current, which can be measured with an electronic counter.
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Dosimeter
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A dosimeter is a detector specifically designed to measure radiation dose (exposure). Dosimeter types are: pocket (ion) chambers, based on integrated circuit components, film badge, thermoluminescent device (TLD) and neutron moderation (spherical) dosimeters.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Your choices are...
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Alpha Particles
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Heavy charged particles.
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Beta Particles
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Fast Electrons.
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Gamma Ray
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Electromagnetic radiation originating from transitions within the nucleus.
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X-Ray
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Electromagnetic radiation originating emitted in the rearrangement of electron shells of atoms.
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Neutron
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Generated in various nuclear processes.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Detectable Activity Range
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Expected Energy Range.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Your choices are...
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Count Rate
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Radiation quanta per unit time. The device records each individual quantum of radiation that interacts with the detector.
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Dose
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The total amount of radiation exposure irrespective of the rate of exposure.
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Dose Rate
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Output is the rate of radiation exposure. A ratemeter is a dose rate device.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Area Monitoring?
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This type of instrument is set up to monitor ambient conditions.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Personnel Monitoring?
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This type of instrument will monitor worker's environment for danger of exposure to radiation.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Output Options
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Your choices are...
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Analog Voltage
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Any analog voltage output. Output voltage is a simple (usually linear) function of the measurement.
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Analog Current
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Often called a transmitter. A current is imposed on the output circuit proportional to the measurement. Feedback is used to provide the appropriate current regardless of line noise, impedance, etc. Useful when sending signals over long distances.
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Frequency / Modulated Frequency
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Frequency or modulated frequency output (Ex. sine wave, pulse train, AM, FM). A format that uses continuous physical variables such as voltage amplitude or frequency variations to transmit information.
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Switch or Alarm
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The output is a switch or alarm.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Local Interface
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Your choices are...
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Analog
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Has analog user inputs such as potentiometers, dials, switches, etc.
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Digital
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Setup or program through the front panel using digital keypad, menus, etc.
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Computer
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Can be controlled or monitored remotely with a computer via interface.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Computer Interface Options
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Your choices are...
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Serial
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Serial communication protocol such as RS-232, RS-485, USB.
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Parallel
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Parallel communication protocol such as GPIB / IEEE-488 / HPIB.
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Other
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Special requirements such as modem, RF transmitter, etc.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Application Software Included?
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For control or for monitoring power source performance.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Your choices are...
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Analog
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Has an analog meter or simple visual indicator.
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Digital
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Has a digital display for numerical values.
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Video
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CRT, LCD or other multi-line display.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Audio Alarm/Indicator?
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The instrument has an audio alarm or indicator.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Visual Alarm/Indicator?
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The instrument has a visual alarm or indicator.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Self-Diagnostics?
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The instrument can perform self-diagnostics to assess any errors.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Memory for Data Storage?
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The instrument has memory to store data for use at a later time.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Hermetically Sealed?
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The instrument has an insulating glass unit that is sealed against moisture.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Plug in Probes?
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The instrument comes with plug in interchangeable probes.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Operating Temperature
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The temperature range over which the device must operate.
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Search Logic:
|
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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