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The Radiation Alert® Area Monitor is one of the most user-friendly, all-inclusive, and state-of-the-art radiation area monitors available. The easy to use interface is an intelligent resistive touch screen display featuring a large five digit LED readout. It comes with either an internal or external detector and free software for monitoring every Radiation Alert® Area Monitor on your network. Includes user selectable warning indicators for low and high radiation alarm levels, low battery, and detector failure. All the settings are stored internally, even when power is disconnected. All units come with a Certificate of Conformance. NIST Source calibrations available upon request.
Radiation Therapy Area Monitor
Model 7008 R/T Radiation Monitor
The Model 7008 R/T is a wall-mounted radiation monitor designed to meet the specific needs of radiation therapy. It is designed to operate continuously from an AC power line. In the event of power failure, the built-in, continuously trickle charged NiMH battery automatically switches in to begin supplying power immediately, assuring interruption-free operation at all times. The monitor features a digital display of radiation rate, audible and visual alarms, and alarm indicator, alarm setpoint adjustability over the entire range, and self diagnostic functions such as low battery, over range, detector saturation and detector failure conditions. A green status light is a positive indication of normal instrument operation.
Model 7008 R Remote Alarm
The optional Model 7008 R remote alarm unit duplicates the alarm indication functions of the main unit It features a green status light, a red light for high alarm, and Sonalert for audible alarm with a disable switch. It is supplied with a 50-foot cable.
Radiation Therapy Area Monitor
The Model 375/2RT is a wall-mounted radiation monitor designed to meet the specific needs of radiation therapy. It is designed to operate continuously from an AC power line. In the event of power failure, the built-in, continuously trickle-charged lead acid battery automatically switches in to begin supplying power immediately, assuring interruption-free operation at all times.
The monitor features a dual range digital display of radiation rate, audible and visual alarms, low alarm and high alarm indicators, alarm setpoint adjustability over the entire range and self-diagnostic functions such as low battery, overrange, detector saturation and detector failure conditions. A green status light is a positive indication of normal instrument operation.
A flashing red light with a 180° visibility and a red LED indicator next to the digital display provide the visual alarm. The audible alarm (which may be disabled with a switch) consists of a single short beep at the beginning of the alarm mode. Optional features include SI units and 220V operation.
The optional Model 375R remote alarm unit duplicates the alarm indication functions of the main unit at a remote location up to 1000 feet away. It features a green status light, a red light for high alarm and Sonalert for audible alarm with a disable switch. The remote unit is powered by the monitor. It is supplied with a 50-foot cable that carries both signals and power.
Radiation Therapy Area Monitor
Model 05-433 Radiation Monitor
The Primalert™10 is a compact monitor that responds to scattered radiation and can be mounted anywhere in the teletherapy room. A pair of bright red lamps on the instrument face flash a warning when the source is exposed, and they continue to flash until safe conditions are re-established. The flashing green operator indicator light continuously monitors the background radiation and provides a visible indication that the instrument is functioning. The monitor is supplied with a self-stick bracket for wall mounting.
Model 05-434 Remote Alarm
The Primalarm™ is a slave unit that allows the Primalert™10 signal output to be duplicated up to 100 feet away. The Primalarm™ also serves as an additional safeguard; it will flash if power to the Primalert™ is lost or if the cable from the latter is disconnected. The Primalarm™ is ideal for mounting outside the therapy room entrance.
Model 05-441 Back-up Battery
To satisfy NRC requirements, the Primalert™10 must be used with the PrimaPak™II. The unit consists of rechargeable gel cells and circuitry that switches any Primalert to battery operation if line power is lost. When AC power is present, the battery is automatically recharged. Fully-charged cells provide about 8 hours of operation under alarm conditions or more than 32 hours of quiescent, no-alarm operation. This package also includes a 115VAC UL-listed wall-mount transformer and interconnect cable.
G.M. Tube Survey Meters
USB Computer Spectrometer
The UCS30 nuclear spectrometer offers many enhancements and additional features for increased flexibility. USB connectivity provides plug and play operation with most computers running Windows op systems. Three models are available with 1024, 2048 and 4096 channels of conversion gain.
The internal preamplifier allows direct connection to scintillation detectors. The bipolar amplifier includes polarity selection and multiple shaping times when using different types of detectors with external preamplifiers. Upper and lower level discriminators may be set for rejection of unwanted signals. The high voltage supply is rated to +2048V for use with scintillation or proportional detectors. Optional polarity selection is available for use with detectors requiring negative bias. A preamplifier power connector (±12V) is included for use with our model PA-1 external preamplifier. A 10µs fixed conversion ADC allows high throughput with deadtime correction. Input selection for preamplifier, amplifier or ADC direct is included by computer control.
Survey Meter for Beta, Gamma and X-Ray Source Detection
- Detects low intensity beta, gamma, and x-rays.
- Solid state detector and electronics for:
- Fast response to radiation.
- Reproducible measurement.
- Accurate detection of signals against background.
- QUART didoSVM survey meter, rechargeable USB cable, manual and transport case.
Handheld Radiation Alert® Detector
The M4 and M4EC are compact, ergonomic, general purpose survey meters capable of detecting alpha, beta, gamma, and X-rays over 3 selectable ranges. A red count light flashes and a beep sounds with each event detected. The Monitor 4EC offers a more linear reading for gamma and X-rays (above 40 keV).
- Monitor 4: Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm² thick.
- Monitor 4EC: Halogen-quenched GM tube, energy compensated sidewall 2mm tin filter. Thin mica window 1.5-2.0 mg/cm² thick.
- Analog Meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale. Optional SI Scale Meter Available.
- 1000 CPM/mR/hr (Cs137). 4EC is the same as M4 except the energy response for gamma and X-rays through the detector sidewall is flat within +61% or -26% over the range of 40 keV to 100 keV, and within +35% or -17% over the range of 100 keV to 1.3 MeV.
- 0-0.5, 0-5, 0-50 mR/hr 0-500, 0-5,000, 0-50,000 CPM or 0-5, 0-50, 0-500 µSv/hr (SI Scale Meter Option).
- X1, X10, X100, Battery Check.
- Typically ±15% of reading (Cs137).
5-Decade G-M Survey Meter
The Model 14C survey meter features an internal energy compensated detector with a 0-2000mR/h range to satisfy the 1R/h requirement for Nuclear Medicine departments. It has a connector for external GM and scintillation probes for contamination surveys and searching for lost seed sources. A built-in Unimorph speaker provides an audible indication of changing radiation rates.
Scintillation probes exhibit greater sensitivity than Geiger-Mueller probes. The ability to detect a radiation source from a greater distance makes them useful for searching for misplaced radioactive sources.
The Model 12-4 consists of a count rate meter with a removable detector. The detector assembly consists of a 1.6cm by 2.5cm BF3 proportional tube, surrounded by 0.0038cm (0.0015") thick cadmium shield, within a 22.9cm (9") diameter polyethylene moderator. This assembly provides an approximate inverse RPG response curve for neutrons ranging from thermal through 10MeV. Efficiency for AmBe neutrons is approximately 30cpm/mrem/h. Gamma sensitivity at Cesium-137 is less than 10cpm through 10R/h.
The Model 15 is designed to detect alpha, beta, gamma and neutron radiation. It consists of a count rate meter with a removable thin-end window alpha, beta gamma probe and a BF-3 neutron proportional tube detector with a 3" diameter cadmium-lined moderator. The detector can be removed from the moderator for fast neutron response.
Over the years, individual manufacturers of Geiger-Mueller-type survey meters have adopted various connectors to mate their handheld detector probes with their readout units.
The above drawing shows outlines of the most common cable connectors used in the industry. To order a cable that mates a probe to an instrument having a dissimilar or identical connector, chose a connector for each end and refer to the table on the right.
Also available are bulkhead (panel mount) connectors that are mounted on the instrument case or on the detector probe. Drawings are shown to help with positive identification of the mating cable connector.
Ludlum Measurements Inc. supplies connector type C on survey meters and probes, with the appropriate cable if no preference is given at the time of the order. MHV, BNC, SHV and UHF connectors with appropriate cables are available as options.
Victoreen, Inc. supplies survey meters with MHV connectors exclusively, Model 190 being the only exception, offering BNC as an option. The table below identifies probes with integral connectors that can be used with the above cables, and integral cables that can be converted using an adapter.
Ion Chamber Survey Meters
Ion Chamber Survey Meter
- Radiation Detected — Gamma & X-rays above 25 keV; Beta above 1 MeV
- Operating Ranges — With R/hr units: 0-500 µR/hr, 0-5 mR/hr, 0-50 mR/hr, 0-500 mR /hr, 0-5 R/hr
- Chamber Volume — 230 cm3 (14 in³) volume pressurized to 8 atmospheres (117 psi)
- Accuracy — ± 10%
- Response Time — 5 seconds in lowest range, 2 seconds in all other ranges, when measuring from 10% to 90% of final value
- Measurement Readouts — Simultaneous display of rate, integrated reading, and highest rate (peak hold)
- LCD Display — 8.9 cm (3.5 in.) diagonal, 240 x 320 (H x W) pixels, TFT active matrix, 262,000 colors, 220 cd/m²
- User Controls — 4 push-buttons: instrument on/off, peak rate/integrate mode, audio on/off, alarm acknowledge/meter reset/clearing integrated dose or peak rate
- Automatic Functions — Auto ranging, auto zeroing, auto LCD backlighting
- Audio Outputs — Built-in unimorph speaker,
> 60 dB at 0.6 meters (2 ft.)
- Alarms — Two levels of radiation alarms available, each are user programmable throughout entire readout range and set through a PC interface program. Other alarms include low battery and various detector failures.
- Temperature Range — -20 to 40 °C (-4 to 104 °F)
- Power — Eight rechargeable AA NiMH batteries, supplied with wall charger for direct connection to instrument
- Battery Life — 12 to 30 hours between charges, depending upon use of backlighting
- USB Interface — Single USB port, may be connected directly to a USB keyboard to facilitate password-protected parameter changes, accepts USB thumbdrive for storing logged data, optional interface kit facilitates connection to a PC for parameter editing and calibration
- Construction — Durable molded plastic with internal metal support
- Size — 21.9 x 11.6 x 24.5 cm (8.6 x 4.6 x 9.6 in.) (H x W x L)
- Weight — 1.5 kg (3.3 lb), including batteries
Ion Chamber Survey Meter
The Model 451B® is the successor to the highly successful Model 450B® rugged, light-weight portable survey meter featuring a thin window ionization chamber with a sliding beta shield, microprocessor technology and an auto-on backlit analog/digital liquid crystal display.
The ionization chamber has a thin mylar window for excellent low-energy X-ray response and detection of alpha and beta particles. The window is protected by a stainless steel mesh and a beta slide that provides buildup.
It is simple to operate; only ON/OFF and MODE buttons are needed because the microprocessor controls both auto-ranging and auto-zeroing.
The display of the 451B® is unique: the 2-1/2 digit display provides reading accuracy for shielding studies while the 100 element analog bar graph, with a faster time constant, makes the instrument ideal for surveying changing radiation levels. The integrate (dose) mode registers scatter doses from the shortest radiographic exposures. Integration begins 30 seconds after the instrument has been turned on and it operates continuously even while in the rate mode. Just press the MODE button to switch to integrate and read the dose that has accumulated during the survey.
The RS-232 interface used with Excel add-in for Windows® allows for data retrieval and user parameter selection while providing virtual instrument display.
The rugged case is sealed against moisture and is available in red/yellow/red (RYR suffix). The 451B® is also available in Dose Equivalent SI units (specify DE-SI suffix).
Pressurized Ion Chamber Survey Meter
The Model 451P® is a revised version of the highly successful Model 450P® survey meter, featuring a pressurized ionization chamber, microprocessor technology and an illuminated analog/ digital liquid crystal display.
The ionization chamber is filled with argon to a pressure of six atmospheres. This greatly improves the sensitivity to low levels of radiation, enhances low energy response, reduces time constant and makes it air density independent. Its ability to read low levels of radiation is 10 times greater than similar non-pressurized ion chamber type survey meters.
The 451P® is simple to operate; only ON/OFF and MODE buttons are needed because the microprocessor controls both auto-ranging and auto-zeroing.
The display of the 451P® is unique: the 2-1/2 digit display provides reading accuracy for shielding studies while the 100 element analog bar graph, with a faster time constant, makes the instrument ideal for surveying changing radiation levels. The integrate (dose) mode registers scatter doses from the shortest radiographic exposures. Integration begins 30 seconds after the instrument has been turned on and the 451P® operates continuously even while in the rate mode. Just press the MODE button to switch to integrate and read the dose that has accumulated during the survey.
An RS-232 interface, used with Excel add-in for Windows®, allows for data retrieval and user parameter selection while providing virtual instrument display.
The rugged case is sealed against moisture and is available in red/yellow/red (RYR suffix). The 451P® is also available in Dose Equivalent SI units (specify DE-SI suffix).
Model N32002, 1 liter volume
Model N32003, 10 liter volume
These low-level, spherical ionization chambers are particularly useful whenever it is necessary to accurately evaluate weak radiation fields, providing dependable service as low level area monitors and in conducting surveys. When used with a sensitive electrometer, ionization currents resulting from natural background radiation are easily measured. The rigid stem provides a convenient means of mounting the chamber.
Electronic Personal Dosimeter
RadTarge II | Electronic Personal Dosimeter is a nextgeneration all-digital electronic personal dosimeter that combines four functions in one:
- Dose Equivalent Rate Meter
- Accumulated Dose Meter
- Active Self-Reading Dose Meter
- Active Self-Alarming Dose Meter
This pager-like, direct-reading EPD accurately detects and measures radiation exposure for workers and responders in potentially hazardous environments.
RadTarge II | Electronic Personal Dosimeter uses a YSO scintillation detector combined with a state-of-the-art silicon photomultiplier (YSO+SiPM) and multi-voltage threshold (MVT) algorithm to detect a wide range of radiation doses.
Proportional, real-time detection and measurement provide meaningful readouts that focus on the awareness and safety of the user during critical times. The fast response and wide dose rate range maximize the safety of your team. Intuitive menu-driven navigation allows users to adjust settings in the field.
A blue acrylic tamper-proof label prevents users from opening the instrument, thus ensuring operational integrity for compliance and liability concerns.
Whole Body Dosimeter
- A whole body dosimeter for occupationally exposed radiation workers based on well-established TLD technology.
- Accurately determines deep, shallow and lens of the eye radiation dose over a broad range of photon energies.
- An extremity ring dosimeter for occupationally exposed radiation workers based on well-established TLD technology.
- Accurately determines shallow radiation dose over a broad range of photon and beta energies.
Solid-State Personal Dosimeter
The RAD-60 personal dosimeter is an extremely compact, solid-state electronic device utilizing a high-performance, energy-compensated silicon diode to measure dose and dose rate in real time. It features an audible alarm that alerts the user immediately that a preset dose or dose rate level has been reached. Dose rate may be monitored by an audible chirping function that can be disabled with a switch.
A single front panel push button provides the following functions: power on/off, chirp on/off, dose/dose rate, integrated dose reset, alarm threshold change and battery check.
A single, easily obtainable AAA alkaline battery supplies power for approximately 1800 hours at background levels in dose mode.
These direct reading dosimeters allow the wearer to read accumulated radiation exposure at any given time without a separate readout device. The integrated exposure is read on a built-in scale that is illuminated by an external light source.
A film badge cannot provide an immediate answer if an overexposure has taken place, but a wearer of a direct reading dosimeter can tell when, where and whether the overexposure took place and hazardous conditions can be corrected long before film badge readings can be known.
The low energy feature of these dosimeters have hospital applications in fluoroscopy, portable radiography, angiography and mammography.
These dosimeters may be reused repeatedly by resetting to zero with the Model 909 dosimeter charger after the accumulated exposure has been recorded in a log.
Model 909, Dosimeter Charger
This dosimeter charger zeroes all direct-reading dosimeters. One standard 1.5V D cell permits thousands of chargings. A safety spring in the charging socket prevents damage to dosimeter in event that excessive force is applied during charging. A protective cap keeps the socket free of dust and moisture when charger is not in use.
Model 06-201-5000, Dosimeter Checker
The Multi-Dosimeter Checker allows the simultaneous testing of up to five direct reading dosimeters. It consists of a plastic cylinder that has five holes around a central, hermetically-sealed Ci-9m Cesium-137 source.
The procedure for checking dosimeters is very simple. Properly charged and zeroed dosimeters are placed in the cylinder and exposed for the required period of time, depending on their range. Typically, a six-hour exposure of a properly-calibrated dosimeter will yield a reading from 25 to 35 mR.
Three standard sizes of lead foil are available in 14" wide rolls. They can be easily cut and formed into almost any shape for shielding areas, parts of areas or objects of all types, offering great convenience if kept on hand.
Sheet lead has numerous applications in building radiation protection systems. It is certified to meet federal specification QQ-L-201F. Sheet lead is available in a wide range of uniform thicknesses from 1/64" (1 lb/ft²) up to 4" (240 lb/ft²). Widths up to 8 feet and lengths up to 25 feet are available in rolled or flat forms.
Call us with your particular design requirements as custom sizes of sheet lead are available upon request.