Radiation Detection & Measurement

Welcome to my collection of radiation detection and identification equipment. While I showcase many of my items here, this represents only a portion of the inventory—I have a wide range of additional detectors, probes, survey meters, spectrometers, and specialized nuclear instrumentation that are not currently listed online. If you are searching for a specific probe, meter, or piece of equipment, I encourage you to contact me directly, as I may have exactly what you need.

Eberline E600 Gamma Set

The Eberline E600 Survey Meter system, offered here with a Smart Adapter, SPA-3 2×2 NaI scintillation probe, Low Energy Gamma (LEG) probe, and calibration cable, is a professional, full-featured radiation detection setup used throughout the nuclear industry. The E600 was designed as a versatile, digital survey instrument capable of interfacing with Eberline’s SMART probe technology, allowing automatic probe recognition, optimized calibration, and precise measurements across a wide range of radiation types and energies.

The included SPA-3 2×2 NaI scintillator provides high sensitivity for gamma radiation detection, making it ideal for environmental surveys, source searches, and contamination assessment. The Low Energy Gamma Probe extends the system’s capability into lower-energy photon detection, commonly required in nuclear facilities, laboratories, and remediation work. The addition of the calibration cable completes a robust and historically significant instrumentation package that reflects the advanced radiological monitoring technology used by health physics teams, power plants, and government agencies.

AUCTION PRICE - $4,000

Ludlum Model 2350 Data Logger

The Ludlum Model 2350 Data Logger with Keypad is a professional-grade radiation data logging instrument designed for advanced survey work, contamination tracking, and environmental monitoring. The Model 2350 is capable of storing and accommodating calibration and operating parameters for up to 16 different probes, allowing users to quickly switch between detectors without reconfiguring the instrument. This made it especially valuable for health physics teams and nuclear facilities conducting multi-probe surveys in the field or laboratory.

In addition to its data logging capabilities, the integrated keypad allows for direct data entry, probe selection, and on-device review of stored measurements. The ability to manage multiple probe settings, combined with durable construction and digital recordkeeping, reflects the transition to more advanced radiological monitoring systems.

AUCTION PRICE: $1,750

Eberline E600 Smart Meter

The Eberline E600 Smart Survey Meter is a professional-grade radiation detection instrument designed for use in nuclear facilities, environmental monitoring, emergency response, and health physics applications. Built to interface with Eberline’s SMART probe technology, the E600 automatically recognizes compatible probes and applies the correct calibration and operating parameters, allowing for fast, accurate measurements across a wide range of radiation types. Its digital display, rugged construction, and flexible probe compatibility made it a trusted tool throughout the nuclear industry.

AUCTION PRICE: $950

Optional Accessory: A SmartPAC adapter is available for this meter for an additional surcharge. The SmartPAC expands the E600’s probe compatibility, enabling use with additional detector types and configurations. This optional upgrade enhances the versatility of the system and is ideal for users or collectors seeking a more complete and capable Eberline SMART instrumentation setup.

AUCTION PRICE WITH SMARTPAC: $1,350

Eberline ASP-1 Smart Portable Meter

The Eberline ASP-1 Smart Portable Detector is a professional-grade radiation detection instrument developed for field use in nuclear facilities, environmental monitoring, and radiological safety operations. Designed for portability and reliability, the ASP-1 was widely used by health physics teams, emergency response personnel, and industrial operators who required accurate, real-time radiation monitoring in demanding environments.

The counter is extremely easy to calibrate and works with a large variety of detectors and types – GM, scintillators, neutron detectors, gas proportional counters, etc. There are 3 selectable pre-programmed calibration factors for use with different detectors. Display scale for the High voltage supplied to the detector and the internal meter's calibration current for quick recalibration in the field.

AUCTION PRICE: $350

Ludlum Model 2

The Ludlum Model 2 is a classic, professional-grade radiation survey meter widely used for detecting alpha, beta, and gamma radiation when paired with the appropriate probe. Compact, rugged, and highly reliable, the Model 2 was designed for fieldwork in nuclear facilities, laboratories, environmental monitoring, and health physics operations where portability and accuracy were essential.

This general purpose, handheld analog ratemeter supports GM, proportional, and scintillation type detectors. The analog meter face comes in a variety of options to support the measurement units and ranges for the optional external detector selected. The front panel controls include a rotary switch for selecting the four-decade range, instrument shut-off and battery test, an audio on/off switch, a fast/slow response switch, a high voltage display button, and a count reset button.

Auction Price - $350

Ludlum Model 3

The Ludlum Model 3 General Purpose Survey Meter is one of the most widely recognized and trusted radiation detection instruments ever produced. Known for its rugged construction, reliability, and ease of use, the Model 3 has been a standard tool for health physics professionals, nuclear facilities, emergency responders, and environmental monitoring teams for decades. Its modular design allows it to be paired with a variety of probes, making it a versatile instrument for detecting alpha, beta, gamma, and X-ray radiation depending on configuration.

This meter represents a cornerstone of practical radiation safety and monitoring throughout the nuclear age. Used at power plants, research laboratories, remediation sites, and during incident response, the Ludlum Model 3 reflects the essential role of instrumentation in protecting workers and the public.

AUCTION PRICE: $500

Ludlum Model 3

AUCTION PRICE: $500

Ludlum Model 5 Geiger Counter

The Ludlum Model 5 is a professional-grade radiation survey meter designed for accurate measurement of gamma and X-ray radiation in demanding field and laboratory environments. Known for its precision, durability, and analog reliability, the Model 5 has been widely used by health physics personnel, nuclear power plants, research facilities, and environmental monitoring teams where dependable exposure-rate measurements are critical.

The Model 5 is a gamma exposure ratemeter equipped with two internally housed, energy-compensated GM detectors that measure over the range of 0 to 20 mSv/h (0 to 2000 mR/hr). The front-panel controls include a rotary switch for selecting the five display ranges and instrument shut-off, an audio on/off switch, a fast/slow response switch, and push-buttons for count reset and battery test.

Auction Price - $250

Ludlum Model 2401-P Survey Meter

The Ludlum Model 2401‑P Survey Meter is a professional-grade radiation detection instrument featuring a built-in 2×2 GM (Geiger-Mueller) probe for reliable gamma and X-ray detection. Designed for portability and durability, the 2401‑P provides consistent, real-time measurements in the field, industrial sites, or nuclear facilities without the need for additional probes. Its rugged construction ensures dependable performance in demanding environments, while the intuitive interface makes it easy to operate for both routine surveys and emergency response situations.

This meter is ideal for area monitoring, contamination surveys, source searches, and general radiation safety assessments. With its integrated GM detector, the 2401‑P delivers rapid and accurate readings, making it a highly practical instrument for professionals and a collectible piece of nuclear instrumentation. Its combination of durability, usability, and built-in detection capability exemplifies Ludlum’s focus on functional, field-ready radiation meters.

AUCTION PRICE: $1,250

Ludlum 44-40 Shielded GM Probe

The Ludlum 44-40 Shielded Probe with Sample Tray is a specialized radiation detection probe designed for low-level counting and sample analysis in controlled survey environments. Featuring integral shielding and a built-in sample tray, the 44-40 allows for more accurate measurements by reducing background radiation and positioning samples consistently over the detector. This design made it especially useful for laboratory work, contamination surveys, and health physics applications where precision and repeatability are essential.

Auction Price - $500

Ludlum Lead Detector Collimator

This Ludlum lead collimator for a 2-inch probe is a specialized radiation-measurement accessory designed to provide directional control and improved measurement accuracy when using compatible Ludlum detectors. By limiting the field of view of the probe, the collimator allows operators to better isolate radiation sources, reduce background interference, and perform more precise surveys in complex or high-background environments. The collimator is constructed from lead (99% lead and 1% antimony) and coated with beige powder coat paint.

Auction Price - $250

Custom 3" NaI Scintillation Probe

This custom 3-inch NaI (Sodium Iodide) scintillation probe is a high-sensitivity gamma radiation detector designed for use in survey work, source searches, and environmental monitoring. Featuring a large 3" crystal, this probe offers enhanced detection efficiency compared to smaller scintillators, making it especially effective for locating low-level gamma sources and conducting wide-area surveys. Custom-built probes of this size are far less common than standard configurations, adding to both their practical value and collectibility.

Compatible with a range of survey meters and counting systems (depending on connector and high-voltage requirements), this probe reflects the type of specialized instrumentation used by nuclear facilities, research laboratories, and health physics teams. Its size, performance, and custom construction make it an excellent choice for professionals seeking increased sensitivity.

AUCTION PRICE: $750

Ludlum Model 44-9

The Ludlum Model 44‑9 is a rugged, high-performance radiation detection probe designed for durability, reliability, and ease of use in demanding environments. Engineered to withstand the rigors of fieldwork, industrial monitoring, and nuclear facility operations, the 44‑9 combines a sturdy construction with user-friendly ergonomics, making it ideal for both professional health physics personnel and scientific collectors. Its design ensures consistent performance even under harsh conditions, including exposure to dust, moisture, and repeated handling, reflecting Ludlum’s reputation for building instruments that last decades.

This probe is compatible with a wide range of Ludlum survey meters and counting systems, providing accurate measurements for alpha, beta, and gamma radiation depending on configuration. Its portability and intuitive interface make it suitable for contamination surveys, area monitoring, source searches, and educational or demonstration purposes. The Model 44‑9 exemplifies the balance of durability, usability, and reliability, making it both a practical instrument for active use and a valuable addition to a collection of historic radiation detection equipment.

AUCTION PRICE: $500

Ludlum Model 44-16

The Ludlum Model 44‑16 is a professional low-energy gamma NaI scintillation probe, designed for accurate detection of low-energy gamma radiation in laboratory, industrial, and field environments. Built with Ludlum’s renowned durability, the 44‑16 features rugged construction that ensures reliable operation under demanding conditions, from routine contamination surveys to long-term monitoring applications. Its ergonomic design and straightforward interface make it easy to handle and integrate with compatible Ludlum survey meters or counting systems.

Specialized for low-energy gamma detection, this probe is ideal for applications such as environmental monitoring, radioactive sample analysis, contamination surveys, and low-energy isotope identification. The 44‑16 combines sensitivity, precision, and ease of use, making it both a practical instrument for professionals and a highly collectible piece of nuclear instrumentation. Its robust design and reliable performance exemplify Ludlum’s commitment to long-lasting, high-quality radiation detection equipment.

AUCTION PRICE: $500

Ludlum Model 43-2

The Ludlum Model 43‑2 is a specialized alpha scintillation probe designed for the detection of alpha radiation in laboratory, industrial, and field environments. Engineered for high sensitivity and reliability, the 43‑2 uses a scintillation crystal optimized for alpha particles, providing precise measurements of contamination and low-level alpha sources. Its durable housing and ergonomic design ensure dependable performance under demanding conditions, including routine surveys, decontamination operations, and educational demonstrations.

Ideal for applications such as wipe tests, contamination surveys, laboratory analysis, and source verification, the Model 43‑2 excels at identifying alpha-emitting isotopes with accuracy and efficiency. Compatible with a range of Ludlum survey meters and counting systems, this probe combines sensitivity, usability, and durability, making it a practical instrument for professionals and a highly collectible piece of nuclear instrumentation history.

AUCTION PRICE: $350

Ludlum Model 43-65 Alpha Scintillator

The Ludlum Model 43-65 Alpha Scintillator Probe is a professional-grade instrument engineered for high-sensitivity detection of alpha-emitting contamination in field and laboratory environments. Designed to pair seamlessly with compatible Ludlum survey meters, the 43-65 delivers reliable, repeatable performance for applications where precise alpha monitoring is critical. Its efficient scintillation detector provides fast response and excellent counting efficiency, making it a trusted choice among health physicists, radiation safety officers, and nuclear professionals.

Built with durability and usability in mind, the 43-65 features a rugged housing suited for routine field deployment while maintaining the sensitivity required for low-level alpha surveys. The probe’s design supports direct surface contamination monitoring, allowing users to quickly assess work areas, equipment, and materials for alpha activity. Its stable performance and straightforward operation make it equally effective for decommissioning work, contamination control programs, laboratory surveys, and educational or research use.

AUCTION PRICE: $500

ThermoScientific ASP-1

The Thermo Scientific ASP‑1 NaI Scintillation Probe is a high-sensitivity gamma radiation detector designed for professional health physics, environmental monitoring, and nuclear facility applications. Utilizing a sodium iodide (NaI) scintillation crystal, the ASP‑1 delivers rapid, accurate detection of gamma radiation with excellent efficiency and energy resolution. Its rugged, industrial-grade construction ensures reliable performance in laboratory, field, and industrial environments, while its ergonomic design makes it easy to handle during extended surveys or contamination assessments.

This probe is ideal for gamma contamination surveys, environmental monitoring, radiation source searches, and low-to-moderate energy gamma spectroscopy. Compatible with a wide range of Thermo Scientific instruments and portable survey meters, the ASP‑1 provides precise, real-time measurements and integrates seamlessly into professional radiation monitoring programs. Its combination of sensitivity, durability, and ease of use makes it both a practical tool for active radiation monitoring and a collectible piece of modern nuclear instrumentation.

AUCTION PRICE: $750

Ludlum Model 44-38 GM Probe

The Ludlum Model 43-68 Shielded Geiger-Mueller (GM) Probe is a specialized, professional-grade detector designed for accurate radiation measurement in elevated or mixed-field environments where unshielded probes can become overwhelmed. Featuring an integrated shielding assembly, the 43-68 significantly reduces low-energy beta and gamma response, allowing users to focus on higher-energy gamma radiation and obtain more meaningful, controlled readings in challenging conditions.

Engineered for use with compatible Ludlum survey meters, this probe is widely employed in nuclear facilities, hot cells, waste handling areas, reactor sites, and emergency response applications. The shielding not only improves measurement selectivity but also enhances probe survivability in high-dose fields, making it a dependable choice for extended surveys where durability and stability are essential. Its GM tube provides fast response and a wide dynamic range, ideal for locating sources, mapping radiation fields, and verifying shielding effectiveness.

Built to Ludlum’s exacting standards, the Model 43-68 features robust construction, dependable electronics, and straightforward operation, ensuring long service life in demanding professional use. For collectors, this probe represents a serious, industrial-grade instrument commonly seen in real-world nuclear operations, not a consumer novelty.

AUCTION PRICE: $350

Technical Associates AB-2 Absorber Set

The Technical Associates Model AB-2 Absorber Set is a professional, laboratory-grade collection designed for precise radiation attenuation studies, detector calibration, and educational demonstrations. This comprehensive set includes 30 individual absorbers spanning a wide mass-thickness range from 0.00 mg/cm² to 1770 mg/cm², allowing users to systematically analyze the absorption characteristics of alpha, beta, and low-energy gamma radiation.

Each absorber is clearly labeled and manufactured to consistent standards, enabling controlled, repeatable experiments when paired with GM tubes, scintillation probes, or proportional detectors. By progressively increasing absorber thickness, users can accurately characterize radiation energy, determine particle type, study shielding effectiveness, and evaluate detector response curves. Sets like the AB-2 are widely used in health physics programs, nuclear engineering labs, training environments, and research facilities.

For professionals, this absorber set is an indispensable tool for instrument verification, teaching, and analytical work. For collectors, it represents an authentic piece of working nuclear laboratory equipment, seldom encountered as a complete set.

AUCTION PRICE: $250

Ludlum Model 2500 Scaler/Ratemeter

The Ludlum Model 2500 is a professional-grade radiation survey and counting instrument designed for precision measurements in laboratory, field, and nuclear facility environments. Known for its versatility and digital accuracy, the Model 2500 supports a wide range of Ludlum detectors and probes, making it suitable for contamination monitoring, sample counting, and detailed radiological surveys. Its configurable settings and clear digital interface allow for reliable data collection across multiple applications.

Commonly used by health physics professionals, research laboratories, and environmental monitoring programs, the Model 2500 reflects a more advanced generation of nuclear instrumentation focused on accuracy, flexibility, and repeatable measurements.

AUCTION PRICE: $750

*There are 3 units available

Ludlum Model 2600 Spectrometer

The Ludlum Model 2600 is a high-performance, professional radiation survey and counting instrument designed for advanced radiological measurement in both field and laboratory environments. In addition to its survey capabilities, the Model 2600 functions as a portable gamma spectrometer, allowing users to analyze energy spectra and distinguish between different gamma-emitting radionuclides when paired with compatible scintillation probes. This capability made it especially valuable for applications where simple count rates were not sufficient and energy discrimination was required.

The Model 2600 was widely used in nuclear power plants, research laboratories, environmental monitoring programs, decontamination and decommissioning projects, and regulatory inspections. Typical applications included radionuclide identification, contamination surveys, sample counting, source characterization, and area monitoring. Its spectrometric functionality, combined with support for multiple probes and operating modes, reflects the evolution of radiation instrumentation toward more sophisticated analysis in the field.

AUCTION PRICE: $1,000

Ludlum Model 2000 Scaler

The Ludlum Model 2000 Scaler is a professional laboratory and field counting instrument designed for precise radiation measurement and sample analysis. Engineered to work with a wide range of Ludlum detectors, the Model 2000 functions as a scaler and ratemeter, allowing users to accurately count radiation events over set time intervals or measure count rates depending on configuration. Its digital design, stable electronics, and straightforward operation made it a reliable tool for health physics, laboratory research, and nuclear facility operations.

The Model 2000 was commonly used in sample counting, contamination analysis, swipe testing, background measurements, and low-level radiation studies. In nuclear power plants and research laboratories, it supported routine radiological surveys, effluent monitoring, and quality control checks. Its precision and adaptability also made it useful for environmental monitoring programs and educational settings.

AUCTION PRICE: $500

EG&G Ortec ACE MCA

The EG&G ORTEC ACE Multi-Channel Analyzer (MCA) is a professional-grade digital spectrometry system designed for high-resolution gamma and alpha spectroscopy. Widely used in nuclear research, health physics, and laboratory environments, the ACE MCA integrates advanced digital signal processing to acquire, analyze, and display radiation energy spectra with exceptional accuracy. Its compact form and modular design made it a versatile solution for both benchtop laboratories and field-deployable spectrometry setups.

When paired with compatible detectors such as NaI(Tl), HPGe, or proportional counters, the ORTEC ACE MCA enables radionuclide identification, isotope analysis, peak fitting, and quantitative spectral analysis. Typical applications include environmental monitoring, nuclear facility operations, safeguards and nonproliferation work, waste characterization, and academic research. Representing a significant evolution from analog spectroscopy systems to fully digital analysis, the EG&G ORTEC ACE MCA is both a powerful analytical tool and a highly collectible piece of modern nuclear instrumentation history.

AUCTION PRICE: $500

EG&G Ortec 92X Spectrum Master

The EG&G ORTEC 92X Spectrum Master is a professional-grade, portable digital multi-channel analyzer (MCA) designed for high-resolution gamma and alpha spectroscopy. Engineered for field or laboratory use, the 92X Spectrum Master allows operators to acquire, store, and analyze radiation spectra with precision, providing reliable energy discrimination and quantitative analysis. Its compact design and intuitive interface made it a versatile tool for health physics, nuclear research, and environmental monitoring applications.

When paired with compatible detectors such as NaI(Tl), HPGe, or proportional counters, the 92X Spectrum Master can be used for radionuclide identification, isotope analysis, contamination assessment, waste characterization, and safeguards inspections. Its portability and advanced digital processing capabilities made it ideal for nuclear facility surveys, field deployment in environmental studies, and academic or research applications. This instrument represents a significant step in digital spectroscopy technology, bridging laboratory-grade performance with field-ready versatility, making it both a functional tool and a collectible piece of modern nuclear instrumentation.

AUCTION PRICE: $750

EG&G Ortec Turbo MCS

The EG&G ORTEC TurboMCS is a high-performance, multi-channel scaler (MCS) designed for advanced radiation detection, spectroscopy, and timing applications. Engineered for laboratory and field use, the TurboMCS provides rapid, accurate counting and real-time spectral acquisition, enabling precise measurement of radiation events over short and long intervals. Its digital architecture, fast data processing, and compatibility with a wide range of detectors make it a versatile tool for both research and applied nuclear monitoring.

The TurboMCS is commonly used for time-resolved measurements, decay studies, coincidence counting, radiation source characterization, and nuclear physics experiments. It is compatible with a variety of detectors, including scintillation counters, proportional counters, and semiconductor detectors, allowing users to adapt it to alpha, beta, or gamma spectroscopy applications. Its portability and robust design made it ideal for laboratory research, educational demonstrations, nuclear facility monitoring, and environmental surveys. Representing a significant advancement in digital nuclear instrumentation, the EG&G ORTEC TurboMCS is both a functional analytical tool and a valuable collectible for enthusiasts of scientific and nuclear instrumentation.

AUCTION PRICE: $500

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