Troxler TroxAlert User manual

Instruction Manual
TROXALERT
Radiation Survey Meter
Troxler Electronic Laboratories, Inc.
and subsidiary
Troxler International, Ltd.
3008 Cornwallis Road, P.O. Box 12057
Research Triangle Park, North Carolina 27709
Tel [phone] Fax [phone]
Web: www.troxlerlabs.com

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Copyright 1987, 1993-1995, 1999, 2001
Troxler Electronic Laboratories, Inc.
All Rights Reserved.
No part of this document may be reproduced or transmitted in
any form or by any means, electronic or mechanical, including
photocopying, recording, or information storage and retrieval
systems, for any purpose without the express written permission
of Troxler Electronic Laboratories, Inc.
PN 104260
October 2001
Edition 7.0

TroxAlertRadiation Survey Meter 3
INTRODUCTION
The TroxAlertRadiation Survey Meter provides an
inexpensive means of fulfilling the survey requirements of an
ALARA (As Low As Reasonably Achievable) program. The
TroxAlert is a basic tool that can be used to survey storage areas
and work sites to ensure a safe working environment.
The TroxAlert uses a Geiger-Mueller (G-M) tube to detect
alpha, beta, gamma, and x-ray radiation. The measured radiation
is shown on the scale and on the LED on the front of the case.
The TroxAlert also beeps when radiation is detected.
NOTE
TroxAlert reactions to natural background
radiation are normal and expected.
The TroxAlert has two switches: the ON–OFF–BATT rocker
switch on the left-hand side of the case and the 3-position range
switch on the front of the case.
The range switch is used to set the measurement range of the
TroxAlert. With the switch in the X1 position, the scale
measures from 0 to 1 mrem per hour (0-10 µSv/h). In the X10
position, multiply all readings by 10 [0 to 10 mrem/h
(0-100 µSv/h)]. In the X100 position, multiply all readings by
100 [0 to 100 mrem/h (0-1000 µSv/h)].

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CHECKING THE TROXALERT
The TroxAlert is powered by a 9-volt alkaline battery. The
battery life is about 2,000 hours under normal operating
conditions.
Always test the battery before using the TroxAlert. To test the
battery, press and hold the top half of the ON–OFF–BATT
switch. When the switch is pressed, the meter needle should
move into the BATT range on the right of the display. If the
needle does not move into this range, then replace the battery.
To access the battery, turn the meter over. Slide the cover on the
bottom of the meter off.
To check the TroxAlert, use any nuclear surface gauge as a
check source. After checking the battery voltage as described
above, turn the meter power on and set the range switch to the
X10 position (change the range as needed). Hold the meter
about 1 foot (0.3 m) away from the gauge and point the meter at
the gauge. Slowly bring the meter closer to where the source rod
meets the gauge top shell. The meter reading [mrem/h (µSv/h)]
should increase as you approach the gauge. If the needle does
not deflect and there are no changes in the alarm, then the
TroxAlert is not working properly.
In case of an accident that involves a nuclear gauge, notify your
Radiation Safety Officer (RSO) as soon as practical. If the only
available gauge is damaged, then check the TroxAlert battery. If
needed, replace the battery. Assume the TroxAlert is working
properly. Use the TroxAlert to locate the source. If you cannot
locate the source, immediately contact your RSO, the licensing
agency, and the gauge manufacturer.

TroxAlertRadiation Survey Meter 5
USING THE TROXALERT
After checking the battery and, if needed, the TroxAlert, the
user is ready to take a measurement. Start with the range switch
in the X100 position. Point the TroxAlert toward the suspected
radiation source. Lower the range until the meter detects
radiation or until the switch reaches the X1 position.
CAUTION
Do not allow the TroxAlert to come in contact with
a radioactive source. Such contact may
contaminate the TroxAlert and render it useless.
In case of TroxAlert contamination, dispose of it properly.
Failure to do so is illegal and dangerous. DO NOT ship a
contaminated TroxAlert to Troxler under any
circumstances.Please call the Troxler Service Department or
Radiation Safety Department at [phone] for instructions.

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CALIBRATION
The TroxAlert responds to alpha, beta, gamma, and x-ray
radiation (gamma and x-ray at a minimum energy level of
40 keV).
Two points on each of the three meter ranges are verified at the
factory by placing the TroxAlert in a field of known radiation.
A cesium-137 (Cs-137) gamma source that is traceable to the
U.S. National Institute of Standards and Technology (NIST) is
used for this calibration. The accuracy of any single reading
based on this calibration is ±20%.
Note that environmental conditions and user technique affect the
accuracy of the TroxAlert reading.
The TroxAlert should be re-calibrated at least once every year
or as required by the user’s license to insure readings within the
stated accuracy range.
For additional information regarding re-calibration procedures,
contact the Troxler Radiation Safety Department at
[phone].

TroxAlertRadiation Survey Meter 7
SPECIFICATIONS
MEASUREMENT SPECIFICATIONS
Detector Geiger-Mueller tube, halogen quenched
Window Thickness 1.5 – 2.0 mg/cm2
Detectable Alpha, beta, gamma, and x-ray
Radiation
Display Range 0 – 1 mrem/h (0 – 10 µSv/h)
0 – 10 mrem/h (0 – 100 µSv/h)
0 – 100 mrem/h (0 – 1000 µSv/h)
Accuracy ±20% of indicated reading,
Cs-137 gamma
Calibration Two points per range using Cs-137
gamma source traceable to the U.S.
National Institute of Standards and
Technology (NIST), Washington, DC.

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ELECTRICAL SPECIFICATIONS
Power Requirement 9V alkaline battery (NEDA 1604A;
included)
Battery Life Up to 2000 hr (normal operational
conditions)
MECHANICAL SPECIFICATIONS
Case Size 5.75 L x 3.25 W x 1.5 D in
(14.6 L x 8.26 W x 3.8 D cm)
Weight 7.68 oz (0.22 kg) with battery
6.08 oz (0.17 kg) without battery
Temperature Range 68 to 122 °F (–20 to 50 °C)
Humidity 20 – 95% (non-condensing)