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What is a Pocket Dosimeter?
Direct Read Pocket Dosimeter
Arrow-Tech dosimeters are rugged, precision instruments about the size of a pocket fountain pen, which are used to measure accumulative doses or quantities of gamma & X-ray radiation.
A metal clip is used to attach the dosimeter to an individual's pocket or to any available object in an area to be monitored for total radiation exposure.
It is pocket-size, conductive-fiber electroscope with an ion chamber for detecting and indication integrated exposure to gamma and x-radiation. It has a thin wall which permits the penetration and detection of radiation.
Range and Model Information
The model 138, 138-S,500 and 500-S are available with a protective hard window which prevents the lens from being scratched. Other models can be special ordered with this feature.
Check out our 200mR dosimeter with an added Rate Meter scale.
0 - 200mR 138
0-200mR/RM 138 RM
0 - 2mSv 138-S
0 - 500mR 500
0 - 5mSv 500-S
0 - 1000mR 715
0 - 2R 720
0 -5R 725
0 - 20R 730
0 - 100R 740
0 - 200R 742
0 -600R 746
Rate Meter RM
If your Dosimeter is going to be used in harsh conditions where scratching of the lens is a concern we recommend a synthetic sapphire window to protect the lens even in the toughest of conditions.
Reading a Dosimeter
The way we "read" a dosimeter is to just point it at a light source so that we can look through it and see the scale. The conductive fiber moves across a very clear well marked scale that produces the reading.
Our dosimeters use an extremely sensitive fiber electrometer type voltmeter and a small volume of air to measure the total amount of radiation to which the instrument has been exposed.
A reading may be made at any time by merely looking at a source of light through the eyepiece end of the instrument. The reading here is at zero. This particular dosimeter is the 200 mR model.
The graduated scale shown is what is viewed when looking through the Dosimeter
Wearing a Dosimeter
You can wear the dosimeter like a pen in your pocket, or clip it to your belt. You can also set it outside for an hour, this will tell you the radiation rate. You don't have to have a radiation meter if you have a dosimeter and are not in a hurry to measure the rate.
Also, if ten or a hundred people are together or going somewhere, only one or two of them need to wear a dosimeter.
So long as they all stay together, the radiation dosage that one gets will be what they all get. It is nice to have two or three, so that you can use one to check the other and make sure that they are working.
The dosimeter is charged (reset to zero) so the dosimeter can be used over and over again. This is usually done before each
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