Radiation Survey Meters


The Radiation Safety Section annually calibrates all survey meters at UIC.  There is no charge for this service.  If you obtain a new meter, notify us as soon as possible at extension 6-7429.  We will pick up the meter, check the calibration in our calibration range, and obtain a check source reading.  Loaners are available while your meter is being calibrated.

Operational Checks

Quarterly operational checks are performed by the Radiation Safety Section on all survey meters.  This procedure takes only a few minutes and we will perform the checks in your laboratory.

Recommended Survey Meter

Experience has shown that all survey meters are not created equally.  Some meters cannot be properly calibrated even when new.  Others are not durable and will not withstand the test of time.  We have significant experience with Ludlum survey meters and recommend them for use at UIC.  If you decide to purchase a different meter, we strongly recommend that you contact us in advance.

We endorse the meter pictured below, a Ludlum Model 3 with a Model 44-7 end window detector.  This moderately priced general purpose Geiger Counter instrument is well suited for detecting all commonly used radionuclides except tritium (H-3) and Fe-55.  It has a built-in speaker powered by the same batteries that operate the meter, and can be switched "on" or "off" while the meter is in use.  Leaving the speaker switch "on" does not drain the battery if the main switch is in the "off" position.  In addition, each meter range has a separate calibration potentiometer.  Survey meters with only one calibration potentiometer are usually difficult to calibrate and in many cases all scales cannot be adjusted to the required accuracy.   All ranges of the Ludlum Model 3 can be easily calibrated to current regulatory standards if the recommended meter face 202-085 is chosen.  In daily use we have found the Ludlum Model 3 to be a very rugged instrument.  With proper care, this meter should provide many years of flawless operation.

Ludlum Model 3 Geiger Counter
Ludlum 202-085 Scale

Ludlum Model 44-7 Detector
BNC Connector, 40-1008 BNC, second from left


This meter may be obtained directly from Ludlum Instruments or from Contemporary Science.  Both addresses are provided below.  When ordering this meter, specify the following information on the purchase order.
Technology, Inc.
Price as of 10/01
(Includes 3% discount for UIC)
Ludlum Measurements, Inc.
Price as of 10/01
Ludlum Model 3 Geiger Counter with 202-085 meter dial and 40-1008 BNC connector
Ludlum Model 44-7 detector with a 1.7 ± 0.3 mg/cm2 end window
Total Price 

Recommended Vendors

Image Technology, Inc.
   840 7th Ave
   Marion, IA 52302-5747
   Contact: Larry Craig, Sales Representative
                (715) 256-4956
FEIN: 42-1440703

Telephone: 1-800-599-2643
FAX: 1-319-373-2210
E-Mail: LarryCraig@USA.NET

Ludlum Measurements, Inc.
   P.O. Box 810
   501 Oak Street
   Sweetwater, Texas 79556
FEIN: 75-1085764
Telephone: 1-800-622 0828
FAX: 1-915-235-4672
E-Mail: ludlum@camalott.com