LUDLUM 26-1 User manual

LUDLUM MODEL 26-1 FRISKER
USER’S MANUAL
April 2017
Serial Number PF002366
and Succeeding Serial Numbers

LUDLUM MODEL 26-1 FRISKER
USER’S MANUAL
April 2017
Serial Number PF002366
and Succeeding Serial Numbers

Model26-1Frisker User’sManual
STATEMENT OF WARRANTY
Ludlum Measurements, Inc. warrants the products covered in this manual to be free of
defects due to workmanship, material, and design for a period of twelve months from
the date of delivery. The calibration of a product is warranted to be within its
specified accuracy limits at the time of shipment. In the event of instrument failure,
notify Ludlum Measurements to determine if repair, recalibration, or replacement is
required.
This warranty excludes the replacement of photomultiplier tubes, G-M and
proportional tubes, and scintillation crystals which are broken due to excessive
physical abuse or used for purposes other than intended.
There are no warranties, express or implied, including without limitation any implied
warranty of merchantability or fitness, which extend beyond the description of the
face there of. If the product does not perform as warranted herein, purchaser’s sole
remedy shall be repair or replacement, at the option of Ludlum Measurements. In no
event will Ludlum Measurements be liable for damages, lost revenue, lost wages, or
any other incidental or consequential damages, arising from the purchase, use, or
inability to use product.
RETURN OF GOODS TO MANUFACTURER
If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please
send to the address below. All shipments should include documentation containing return shipping
address, customer name, telephone number, description of service requested, and all other necessary
information. Your cooperation will expedite the return of your equipment.
LUDLUM MEASUREMENTS, INC.
ATTN: REPAIR DEPARTMENT
501 OAK STREET
SWEETWATER, TX 79556
800-622-0828 325-235-5494
FAX [phone]

Model26-1Frisker User’sManual

Model26-1Frisker User’sManual
Table of Contents
Introduction 1
Getting Started 2
Unpacking and Repacking 2-1
Battery Installation 2-2
Instrument Operational Test 2-3
Detector Failure Diagnostic 2-5
Detector Over Range 2-5
Instrument Use and Controls 2-6
RATE Mode Operation 2-7
MAX Mode Operation 2-8
COUNT Mode Operation 2-9
Specifications 3
Gamma Energy Compensation 4
Setup mode 5
Setup Overview 5-1
Default Setup Values 5-2
Entering Setup Mode 5-3
Setup Mode Operation 5-4
Safety Considerations 6
Environmental Conditions for Normal Use 6-1
Warning Markings and Symbols 6-1
Cleaning and Maintenance Precautions 6-2
Revision History 7
Recycling 8
Maintenance and Spare Parts 9
Maintenance 9-1
Spare Parts 9-1

Model26-1Frisker User’sManual

Model26-1Frisker User’sManual Section1
Ludlum Measurements, Inc. Page 1-1 April 2017
Introduction
The Model 26-1 is an ergonomic, lightweight instrument, which can be
used for alpha/beta contamination frisking or for measuring gamma
exposure or dose. It features the ability to measure radiation in count
rate, exposure rate/dose, activity rate, integrated exposure/dose, time-
averaged rates, and scaler counts. The Model 26-1 utilizes a standard 15
cm2(0.9 in2) Geiger-Mueller "pancake" detector, which can detect alpha,
beta, or gamma radiation. Caution is needed when handling the
instrument because of the thin radiation detector's window.
Three modes of operation are available for the Model 26-1 – RATE,
MAX, and COUNT. RATE mode operation will display the current
count, exposure, or activity rate. MAX mode is used to capture the
highest count, activity, or exposure rate detected – useful for finding a
peak rate, or frisking when the display is not visible. Primary and
Secondary Units for RATE and MAX modes can be chosen from cps,
cpm, Bq, dpm, mR/h, or µSv/h. COUNT mode allows the user to
perform a count for a predetermined time. Depending on the Count
Units chosen, the result can be a scaler count (in counts or
disintegrations), a time-averaged rate (cpm, dpm, Bq, cps), a time-
averaged exposure or dose (mR/h, µSv/h), or an integrated exposure or
dose (mR or µSv).
Note: The use of the unit to measure gamma dose or exposure
correctly can be enhanced by using an optional snap-on energy
filter. Without this filter, the energy response of the pancake
detector will over-respond to gamma energies in the 20-150 keV
range. See the Gamma Energy Response graph and more
detailed information in Section 4. Ludlum Measurements
recommends the use of its Exposure Filter 4498-334, or the
Ambient Dose Equivalent Filter 2002-1050.
Sectio
n
1