NDS Products — ND-15 Personal Rate Alarm

Personal Radiation Rate Alarm with Two Audible Range Alarms
SKU: ND-15

Overview

The NDS Products ND-15 is a compact personal radiation rate alarm designed to provide an audible warning when the wearer enters an area where radiation levels exceed preset alarm thresholds.

The unit features two audible range alarms, allowing personnel to receive escalating warning indications as the detected radiation rate increases. This makes the ND-15 useful as an additional personal awareness device for industrial radiography, radiation-controlled areas, nuclear operations, maintenance activities, laboratories, and other environments where ionizing radiation may be present.

Designed for individual use, the ND-15 can be carried or worn by personnel working around X-ray or gamma-ray sources. It is intended to supplement—not replace—required personal dosimetry, survey meters, controlled-area procedures, and other radiation-protection measures.

What's Included

Note: Personal dosimeter, survey meter, batteries, calibration documentation, belt clip, carrying case, and other accessories should be confirmed separately unless specifically included.

Box Dimensions & Shipping Weight (Estimated)

Actual shipping dimensions and weight may vary depending on packaging and included accessories.

Key Specifications

Note: Exact alarm thresholds, energy response, operating range, detector type, battery requirements, and calibration interval should be confirmed against the specific ND-15 configuration and applicable radiation-safety program.

Dual Audible Alarm System

The ND-15 incorporates two audible alarm ranges, giving the wearer a progressive warning as radiation conditions change.

This dual-alarm configuration can help provide:

• Initial warning when radiation reaches the first preset threshold

• Higher-level warning when radiation reaches the second threshold

• Immediate audible awareness without needing to continuously view an instrument display

• Faster recognition of changing radiation conditions

• Additional support when working near controlled or restricted radiation areas

Alarm settings and required response actions should follow the facility's radiation-protection procedures.

Performance Features

Two Audible Radiation Alarms
Provides two distinct alarm levels to help alert personnel as radiation-rate conditions increase.

Personal Portable Design
Intended to be carried or worn during work around radiation-producing equipment or radioactive sources.

Immediate Warning Capability
Audible indications can help personnel recognize elevated radiation conditions without continuously observing a meter.

Supports Radiation Awareness
Provides an additional layer of awareness when entering or working near radiation-controlled locations.

Field-Oriented Operation
Suitable for personnel performing industrial radiography, NDT, maintenance, inspection, and radiation-safety work.

Simple Personal Monitoring Concept
Designed to provide a direct warning function without replacing the more detailed measurements provided by a radiation survey meter.

User-Friendly Design

• Compact personal format

• Two-level audible warning system

• Designed for easy carrying during field work

• Provides hands-free radiation awareness when worn

• Suitable for industrial radiography crews

• Supports routine controlled-area work

• Simple alarm-based operation

• Can supplement personal dosimetry programs

• Practical for inspection and maintenance personnel

Built for Radiation-Controlled Environments

• Suitable for professional radiation-safety applications

• Useful during industrial X-ray inspection

• Practical for gamma-ray radiography operations

• Suitable for maintenance near radiation-producing equipment

• Supports controlled-area access procedures

• Useful for nuclear and laboratory environments

• Can provide additional awareness during source handling

• Intended for use by trained personnel under established radiation-safety procedures

Personal Rate Alarm vs. Dosimeter

A personal rate alarm and a personal dosimeter perform different functions.

Personal Rate Alarm

• Warns the wearer of elevated radiation-rate conditions

• Provides immediate audible notification

• Helps indicate changing radiation fields

• Supports real-time awareness

Personal Dosimeter

• Measures or records accumulated radiation dose

• Supports occupational exposure tracking

• May be passive or electronic

• Is typically required as part of a formal radiation-protection program

The ND-15 should not be considered a replacement for required dosimetry.

Personal Rate Alarm vs. Survey Meter

The ND-15 is also not a substitute for a calibrated radiation survey meter.

A survey meter is used to:

• Measure radiation-rate values

• Establish radiation boundaries

• Confirm controlled-area conditions

• Verify source return or shielding

• Perform formal radiation surveys

The ND-15 is intended primarily to provide personal audible warning.

Ideal Applications

• Industrial radiography

• X-ray NDT inspection

• Gamma-ray NDT inspection

• Pipeline radiography

• Weld radiography

• Radiation-controlled areas

• Nuclear facilities

• Power-generation facilities

• Research laboratories

• Medical or industrial radiation environments

• Source-handling operations

• Maintenance near radiation sources

• Emergency-response support

• Radiation-safety programs

• Field NDT service work

Typical Users

The ND-15 may be suitable for:

• Industrial radiographers

• Radiographic assistants

• NDT technicians

• Radiation Safety Officers

• Nuclear maintenance personnel

• Laboratory technicians

• Source-handling personnel

• Inspection supervisors

• Field service technicians

• Workers entering controlled radiation areas

Operating Guidelines

Before use:

• Inspect the device for physical damage

• Verify the battery condition

• Perform any required functional or alarm test

• Confirm calibration status when applicable

• Verify that both alarm levels operate correctly

• Ensure the device is positioned where the audible alarm can be heard

• Follow facility-specific pre-use requirements

During use:

• Wear or carry the alarm as required by procedure

• Remain attentive to alarm indications

• Respond immediately if an alarm activates

• Do not rely solely on the personal alarm to establish radiation boundaries

• Use an appropriate survey meter for quantitative radiation measurements

• Follow instructions from the Radiation Safety Officer or site procedure

Alarm Response

If the ND-15 activates:

• Stop the activity if required by procedure

• Move away from the suspected radiation source

• Increase distance from the radiation field

• Notify the responsible radiation-safety personnel

• Use a calibrated survey meter to evaluate the area

• Verify source position and shielding

• Do not re-enter until conditions have been confirmed safe

• Document the event when required

Specific response requirements depend on the facility, radiation source, applicable regulations, and operating procedure.

Compatibility

The ND-15 can be used as part of a radiation-protection program alongside:

• Electronic personal dosimeters

• Passive dosimeters

• Radiation survey meters

• Area radiation monitors

• Gamma-ray exposure devices

• Industrial X-ray equipment

• Radiation warning barriers

• Controlled-area signs

• Radiation alarm systems

• Source-handling equipment

• NDT radiography procedures

Radiation Safety Considerations

The ND-15 should be used as a supplementary warning device.

It should not replace:

• Required personal dosimetry

• Calibrated radiation survey instruments

• Radiation boundary control

• Source accountability

• Shielding requirements

• Regulatory monitoring

• Site-specific radiation-safety procedures

• Qualified radiation-safety supervision

Personnel using the device should be trained in radiation hazards and appropriate alarm-response actions.

Care and Handling

• Avoid dropping or striking the device

• Keep the enclosure clean and dry

• Protect from excessive moisture

• Do not expose the unit to temperatures beyond its intended operating limits

• Inspect the housing and controls regularly

• Check battery condition before field use

• Perform functional checks according to procedure

• Store in a clean, protected location

• Remove batteries during extended storage if recommended

• Do not attempt unauthorized internal modification

Calibration and Functional Checks

For dependable operation:

• Follow the applicable calibration program

• Verify alarm response at required intervals

• Maintain calibration or service records when required

• Perform pre-use operational checks

• Remove the unit from service if alarms do not function correctly

• Have repairs or calibration performed by qualified personnel

• Follow regulatory and facility-specific requirements

About NDS Products

NDS Products supplies radiation-monitoring and radiation-safety equipment for industrial, NDT, laboratory, and controlled-area applications. Products such as personal alarms and related monitoring devices support personnel working around X-ray and gamma-ray radiation by providing additional awareness within established radiation-protection programs.

User Manual