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Table of Contents
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Summary of Contents for Keison Digilert 100
- Page 1 Nuclear Radiation Monitor Operation Manual 3/06...
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Page 2: Table Of Contents
Contents Page 1 Introduction How the Digilert 100 Detects Radiation 2 Features The Display The Switches The Detector The Ports 3 Operation Units of Measurement Starting the Digilert 100 Operating Modes Operating Ranges and Response Times Taking a Timed Total Count... - Page 3 * Do not put the Digilert 100 in a microwave oven. It cannot measure microwaves, and you may damage it or the oven. * If you expect to not use the Digilert 100 for longer than one month, remove the battery to avoid damage from battery corrosion.
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Page 4: Introduction
Ensure compliance with regulatory standards Check for leakage from X-ray machines and other sources Set the alert level and use the Digilert 100 in Alert mode; if the radiation goes above the level you set, the alert beeper sounds to let you know... -
Page 5: The Display
Whenever the Digilert 100 is operating, the red count light (1) flashes each time a count (an ionizing event) is detected. (1) LCD Display (2) Mode Switch (7) Count Light (3) On/Off/Audio (8) CAL Input Switch (9) Output Illustration 1 (4) Set Button (5) Plus &... -
Page 6: The Switches
MENU (J) appears when you are in the Utility Menu. The Switches The Digilert 100 has two switches on the front, and three buttons on the end panel. Each switch has three settings, which are described below. On/Off/Audio Switch (3) Audio. -
Page 7: The Detector
Geiger tube has a thin disk of mica, which alpha radiation can penetrate, on its end. The screened opening at the top of the Digilert 100 is called the window. It allows alpha and low-energy beta and gamma radiation to penetrate the mica end of the tube. -
Page 8: The Ports
To start the Digilert 100, set the top switch to the mode you want, and set the bottom switch to On or Audio. The Digilert 100 then does a four-second system check, displaying all the indicators and numbers. -
Page 9: Operating Ranges And Response Times
(or μSv/hr) is calculated using a conversion factor optimized for Cesium-137, so this mode is less accurate for other radionuclides, unless you have calibrated the Digilert 100 for a specific radionuclide using an appropriate source. It is more appropriate to measure alpha and beta activity using CPM than using mR/hr. -
Page 10: Taking A Timed Total Count
Utility Menu; see "The Utility Menu" in this chapter. Taking a Timed Total Count The Digilert 100 can give you a total count for a timed period of from one minute to 24 hours. A timed total count is useful for determining the average counts per minute over a period of time. -
Page 11: Using The Alert
For example, if the display shows 00:21, 21 minutes remain. 4. At the end of the timed period, the Digilert 100 beeps three times, and repeats the beeping several times. The number displayed is the total count. -
Page 12: The Utility Menu
Utility Menu mode, and the display will show "0" and "MENU". To adjust another Utility Menu option, repeat the above steps. 5. To exit the Utility Menu at any time, press the SET button again. The Digilert 100 continues with the normal start-up routine. Options Function... -
Page 13: Interfacing To An External Device
Displays software version number Interfacing to an External Device The lower output jack on the left side of the Digilert 100 is a dual miniature jack that provides a data output that can be used to drive external devices. You can use it to record the counts on a computer, data logger, or accumulating counter. -
Page 14: Establishing The Background Count
(for example 6, 12, or 24 hours). Checking an Object To check an object, put the Digilert 100 next to it. The end window should be facing and close to the object; otherwise you may miss alpha and low-level beta radiation. -
Page 15: Maintenance
Digilert 100 properly. Calibration The Digilert 100 should be calibrated as often as your regulations require. The best way to calibrate is using a calibrated source. If no source is available, it is possible to calibrate electronically using a pulse generator. - Page 16 This filters the beta emissions. Follow these steps: 1. Start with the Digilert 100 turned off and the Mode switch set to mR/hr. 2. Hold down the - button on the end panel while you turn the On/Off/Audio switch to On.
- Page 17 5 volts. 2. Plug the cable into the upper jack. 3. Start with the Digilert 100 turned off and the Mode switch set to mR/hr. Hold down the - button on the end panel while you turn the On/Off/Audio switch to On.
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Page 18: Troubleshooting
Troubleshooting The Digilert 100 is a highly reliable instrument. If it does not seem to be working properly, look through the following chart to see if you can identify the problem. Problem Possible Cause What To Check Display is blank... -
Page 19: Basics Of Radiation And Its Measurement
If the Digilert 100 requires servicing, please contact your distributor or the manufacturer at the following address: Do not attempt to repair the Digilert 100; it contains no user-serviceable parts and you could void your warranty. CAUTION: Do not send a contaminated instrument for repair under any circumstances. -
Page 20: Ionizing Radiation
readings. Ionizing Radiation Ionizing radiation is radiation that changes the structure of individual atoms by ionizing them. The ions produced in turn ionize more atoms. Substances that produce ionizing radiation are called radioactive. Radioactivity is a natural phenomenon. Nuclear reactions take place continuously on the sun and all other stars. -
Page 21: Measuring Radiation
The amount of radiation is generally measured by measuring the resulting ionization. The Geiger tube used in the Digilert 100 consists of an anode and a cathode (positive and negative electrodes) separated with a mixture of argon, neon, and either chlorine or bromine gases. The cathode is a thin-walled metallic cylinder sealed at each end with an insulating disk to contain the gas. -
Page 22: Determining What Is A High Reading
A bequerel (Bq) is equivalent to one disintegration per second. Determining What Is a High Reading Due to the random nature of radioactivity, the Digilert 100 reading varies from minute to minute. In one location with only background radiation, the reading in mR/hr might vary in ten minutes from .007 to .018. -
Page 23: Appendix A Technical Specifications
Appendix A Technical Specifications Detector: Halogen-quenched Geiger-Mueller tube with mica end window . Mica window density 1.5-2.0 mg/cm2. Side wall is .012" thick #446 stainless steel. Display: 4-digit liquid crystal display with mode indicators Operating Range: mR/hr: .001 to 110 CPM: 0 to 350,000 Total:... -
Page 24: Appendix B Options
Appendix B - Options Digilert 100 Protective Case Ideal for military applications, this is the ultimate case for protection from severe weather, drops, and more. Made from a nearly indestructible material, it has been designed to house the Inspector in a... -
Page 25: Observer Software
Observer Software The Observer software runs on a Windows platform and can be used with the Inspector, Digilert 50, and Geiger Radiation Monitors. As an option, any of our Radiation Alert® instruments can be modified to interface with the Observer. The Observer reads in Counts, CPM, and CPS and has the ability to collect, log, and perform statistical analysis on the data received. - Page 26 Thank you for reading this data sheet. For pricing or for further information, please contact us at our UK Office, using the details below. UK Office Keison Products, P.O. Box 2124, Chelmsford, Essex, CM1 3UP, England. Tel: +44 (0)330 088 0560 Fax: +44 (0)1245 808399 Email: sales@keison.co.uk...
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