TROXLER TroxAlert User Manual

Instruction Manual

TROXALER



T

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

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

2

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
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

position, multiply all readings by 10 [0 to 10 mrem/h

(0-100 µSv/h)]. In the
100 [0 to 100 mrem/h (0-1000 µSv/h)].

position, multiply all readings by

X100

ON–OFF–BATT

rocker

X10

TroxAlert Radiation Survey Meter 3

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
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

position (change the range as needed). Hold the meter

X10

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.

ON–OFF–BATT

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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
radiation source. Lower the range until the meter detects
radiation or until the switch reaches the X1 position.

In case of TroxAlert contamination, dispose of it properly.
Failure to do so is illegal and dangerous.

contaminated TroxAlert to Troxler under any
circumstances.

Radiation Safety Department at [phone] for instructions.

position. Point the TroxAlert toward the suspected

X100

CAUTION

Do not allow the TroxAlert to come in contact with
a radioactive source. Such contact may
contaminate the TroxAlert and render it useless.

DO NOT ship a

Please call the Troxler Service Department or

TroxAlert Radiation Survey Meter 5

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].

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SPECIFICATIONS

MEASUREMENT SPECIFICATIONS

Detector

Window Thickness

Detectable
Radiation

Display Range

0 – 10 mrem/h (0 – 100 µSv/h)
0 – 100 mrem/h (0 – 1000 µSv/h)

Accuracy

Cs-137 gamma

Calibration

Geiger-Mueller tube, halogen quenched

1.5 – 2.0 mg/cm

Alpha, beta, gamma, and x-ray

0 – 1 mrem/h (0 – 10 µSv/h)

± 20% of indicated reading,

Two points per range using Cs-137

gamma source traceable to the U.S.
National Institute of Standards and
Technology (NIST), Washington, DC.

2

TroxAlert Radiation Survey Meter 7

ELECTRICAL SPECIFICATIONS

Power Requirement

Battery Life

Up to 2000 hr (normal operational

9V alkaline battery (NEDA 1604A;

included)

conditions)

MECHANICAL SPECIFICATIONS

Case Size

(14.6 L x 8.26 W x 3.8 D cm)

Weight

6.08 oz (0.17 kg) without battery

Temperature Range

Humidity

5.75 L x 3.25 W x 1.5 D in

7.68 oz (0.22 kg) with battery

68 to 122 °F (–20 to 50 °C)

20 – 95% (non-condensing)

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