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Ludlum Measurements 23 Technical Manual

Electronic personal dosimeter
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MODEL 23 AND 23-1
ELECTRONIC PERSONAL DOSIMETER
May 2024

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Summary of Contents for Ludlum Measurements 23

  • Page 1 MODEL 23 AND 23-1 ELECTRONIC PERSONAL DOSIMETER May 2024...
  • Page 2 MODEL 23 AND 23-1 ELECTRONIC PERSONAL DOSIMETER May 2024...
  • Page 4 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.
  • Page 5 Ludlum Measurements, Inc. May 2024...

  • Page 6: Table Of Contents

    Description of Controls and Functions Parts and Features Display Operation Preparing the Instrument for Use Display During Normal Operation Display During Abnormal Situation Operating Procedure Alarm Safety Considerations Environmental Conditions for Normal Use Precautions Cleaning Instructions Recycling Calibration Procedure Ludlum Measurements, Inc. May 2024...

  • Page 7: Introduction

    It can be compared to the size of an ink pen. The Model 23 is sensitive to a wide range of energies from 35 keV to 3 MeV. Dose, dose equivalent rate, and alarm values are easily seen on the four-digit LCD screen.

  • Page 8: Getting Started

    Replace the battery with the following procedure: 1. Press and hold the power switch (color: red) for approximately two seconds until the Model 23 turns off. 2. Remove the battery door. 3. Extract the used battery using miniature pliers or something similar and insert the new battery with the negative (-) side facing upward.
  • Page 9 Technical Manual Section 2 Caution: Always turn off the Model 23 EPDi before replacing the battery. Be sure to observe proper polarity when replacing the battery. This product operates on the CR2450 battery (3.0 V) only (Part # 21-8639). Only use the battery specified.

  • Page 10: Specifications

    2 cpm per µSv/h (20cpm/mR/hr) Sensitivity: 600 records (optional IR reader required for data Data Logging: transmission to PC). When the Model 23 is turned off, the accumulative dose data is automatically deleted. if Data Reset setting is effective, accumulated dose and Data Reset: operating time shall be reset at the time of startup automatically.
  • Page 11 Model 23 & 23-1 Technical Manual Section 3 ≤90% (non-condensing) Operating Humidity: operates properly after a vertical drop test from 20 cm Shock Resistant: one each coin-type lithium battery (CR2450) Power: typically one month at 8 hours per day in non-alarm status Battery Life: 12 x 30 x 112.8 mm (0.5 x 1.2 x 4.4 in.) (H x W x D) without clip...

  • Page 12: Description Of Controls And Functions

    Model 23 & 23-1 Technical Manual Section 4 Section Description of Controls and Functions Parts and Features LED Lamp Normal operation: green flash Eyelet Warning: red flash Selection Buttons Power Switch Buzzer Display Infrared Communication Window Battery Cover Clip Ludlum Measurements, Inc.

  • Page 13: Display

    LCD display, black and white are inverted and you cannot change brightness. Display During Normal Operation Display (Accumulated Dose) Indicates that the Model 23 measures accumulated dose of gamma rays in Measurement Mode. When the indicated value exceeds the upper limit of the...

  • Page 14: Operation

    Section Operation Preparing the Instrument for Use To start the Model 23 EPDi, press and hold the power switch (color: red) for approximately two seconds. If data reset is effective, accumulated dose and operating time shall be reset at the time of startup automatically.

  • Page 15: Display During Abnormal Situation

    Model 23 turns ON. Operating Procedure Point the “body side” (display side) of the Model 23 towards your body and insert the Model 23 into your pocket, securing it with the clip as shown below. To turn off the Model 23, press and...
  • Page 16 Model 23 & 23-1 Technical Manual Section 5 The operational flow of the Model 23 is as follows: The Model 23 operates in two modes – Measurement Mode and Configuration Mode. Measurement Mode: The Model 23 continuously measures gamma ray accumulated dose and gamma ray dose rate.
  • Page 17 Model 23 & 23-1 Technical Manual Section 5 Ludlum Measurements, Inc. Page 5-4 May 2024...

  • Page 18: Alarm

    Model 23 & 23-1 Technical Manual Section 5 Alarm Alarm Indicator Conditions Alarm Buzzer When Accumulated The short-pitched Dose or the Dose beep (0.1 second) Rate of gamma rays sounds every reaches the preset second five times. values, the pre-alarm ALM DOSE activates.
  • Page 19 Model 23 & 23-1 Technical Manual Section 5 Alarm Indicator Conditions Alarm Buzzer Activates when the (No Alarm Buzzer) Red flashes every over Accumulated Dose two seconds (Overflow) has reached 100 rem or when the Dose Rate is equal to or greater than 100 rem/h.

  • Page 20: Safety Considerations

    Pollution Degree 2 (as defined by IEC 664) JIS Waterproof Grade 1: water resistant under normal living conditions Notice! The Model 23 Dosimeter may not measure pulsed radiation accurately. Also, do not use it as a survey meter. Warning: To prevent short-outs, protect exposed terminals with insulating tape prior to disposal.

  • Page 21: Cleaning Instructions

    Caution! Do not force open the clip, as it may be damaged. Cleaning Instructions The Model 23 Dosimeter may be cleaned externally with a dry cloth if contaminated with dirt. Caution! The operator or responsible body is cautioned that the protection provided by the equipment may be impaired if the equipment is used in a manner not specified by Ludlum Measurements, Inc.

  • Page 22: Recycling

    To this end, Ludlum Measurements, Inc. strives to supply the consumer of its goods with information regarding reuse and recycling of the many different types of materials used in its products. With many different agencies - public and private - involved in this pursuit, it becomes evident that a myriad of methods can be used in the process of recycling.

  • Page 23: Calibration Procedure

    Cs and Co. A dose rate should be measured by placing the source at the distance from the reference point of the Model 23, and it should be traceable to the National Standard. 1. Determine a reference dose rate value (R a.
  • Page 24 Model 23 & 23-1 Technical Manual Section 8 In general, the calibration factor (C ) is calculated by the following formula: : Original Calibration Factor 4. Set up the calibration factor. To change the calibration factor, perform the following procedures: a.

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