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       Ludlum Model 25 Personal Radiation Monitor.       
Ludlum Measurements, Inc! The Ludlum Model 25, Personal Radiation Monitor - Dosimeter/Ratemeter, is a small, lightweight and yet rugged (shock proof and water resistant), alarming dosimeter. The Model 25 continuously monitors and alerts medical or hazmat personnel to the presence of radiation while also keeping track of the accumulated dose. The dual audible and visual alarms are adjustable over the entire display range.

* Dose rate: 0.01 mR/hr to 1999 R/hr
* Dose: 0.01 mR to 1999 R

Calculated "stay-time" to the programmed alarm is displayed by pressing the Mode key. The Model 25 is also available in an "Intrinsically Safe" version for use in Hazmat or Surgical Applications, where explosive gasses may be an issue

The Model 25 may also be used for monitoring the (real-time) daily accumulated dose of pregnant employees in Nuclear Medicine departments and Radiology/Fluoroscopic environments throughout the medical center.

A protective Rubber Case and Lanyard or Belt Clip are included.

  • 0 - 1000 R/hr Dose Rate Range
  • 0 - 1999 R Accumulated Dose Range
  • Loud Alarms
  • Lightweight
  • Rugged
  • Easy to Use
  • 6000 Hour Battery Life

  • Specifications
    DISPLAY RANGE: 0.01 mR/hr to 1,000 R/hr
    DETECTOR: Internal energy-compensated GM
    GAMMA SENSITIVITY: 18 cpm/mR/hr
    ENERGY RANGE: 60 keV to 2 MeV
    DISPLAY: 3 digit backlit LCD display with a total range from .01 mR/hr (or mR) to 1999 R/hr (or R), also displays time remaining from 19:59 to 00:01 (in hh:mm format)
    ALARMS: Radiation alarms adjustable over entire range:
    1. Dose rate alert
    2. Dose rate (hi)

    3. Accumulated dose alert
    4. Accumulated dose (hi)
    5. Time remaining to allowed dose (hi)
    6. Detector failure
    7. Low battery notice when only 8 hours remain
    ALARM INDICATIONS: Distinct alerts and alarms for exposure and accumulated dose
    AUDIO: Built in speaker (typically 95 dB at 1 foot )
    LOSS OF COUNT: Detector failure results in a visual and audible warning
    CALIBRATION: Requires no tools or software when exposed to a traceable radiation field
    POWER: 2 each lithium coin cell batteries
    BATTERY LIFE: Typically 6000 hours
    CONSTRUCTION: Injection-molded plastic housing with sub-surface printed membrane front panel, completely gasketed for water resistance. Supplied with rubber boot with built-in belt feed-through
    TEMPERATURE RANGE: -40°F to 150°F (-40°C to 65°C)
    SIZE: 3.0"H x 2.125"W x 0.687"D (7.6 cm x 5.4 cm x 1.7 cm)
    WEIGHT: 5.1 oz including batteries

    Stock #
    Your Price
    Personal Radiation Monitor - Dosimeter/Ratemeter
    Personal Radiation Monitor - Dosimeter/Ratemeter
    (Intrinsically Safe Version)
    Arm Band Case
    Nylon Case

           Ludlum Quartz/Carbon Fiber Direct Read Pocket Dosimeters.       

    Ludlum Measurements, Inc! FEATURES
  • Sensitive to Gamma and X-ray
  • 0 - 200 mR
  • Lightweight
  • Hermetically Sealed
  • Sturdy Pocket Clip
  • Meets ANSI N13.5 & N322

    The Classic Model AT series, Direct Read Quartz/Carbon Fiber Pocket Dosimeters are available in a variety of monitoring ranges. The Low energy Model AT-138 (0-200mR) may be used in Laboratory or Medical environments where gross accumulated dose measurements may be required for documentation of worker and visitor traffic in restricted areas.

    RANGE: 0 - 200 µR
    ENERGY RESPONSE: 16 keV to 2 MeV
    RADIATION DETECTED: Gamma and x-ray from 16 keV to 2 MeV
    ENERGY RESPONSE: See response curve
    DETECTOR: Fiber electrometer mounted in an electrically conducting plastic ion chamber
    DETECTOR HOUSING: Very low permeability plastic, hermetically sealed

    ACCURACY: Within 10% of true exposure
    RATE RESPONSE: Dose rate independent for gamma and x-radiation
    ELECTRICAL LEAKAGE: Less than 0.5% of full scale for 24 hours at 50°C
    TEMPERATURE RANGE: -4°F to 122°F (-20°C to 50°C)
    DIMENSIONS: Length: 4.5 in (12.4 cm), Diameter: 0.6 in. (1.5 cm)
    WEIGHT: 1.0 oz. (25 grams)
    FINISH: Barrel and end caps: Natural matte black; Clips: Color coded plastic (color signifies range) or metal clips
    WARRANTY: 2 year limited warranty

  • Meets ANSI Specifications N13.5 and N322
  • Low Leakage: Measures Background

    Model AT909 Charger: (Part No. 51-2938) The 909 is a compact lightweight instrument designed to charge direct reading pocket dosimeters.
  • Capable of Recharging Dosimeters Thousands of Times
  • Single "D" Cell Battery
  • Lightweight

  • The Charger: (Part No. 51-2940) The Charger can zero a variety of quartz and carbon fiber dosimeters by squeezing the lever of a piezoelectric generator. This unit does not require batteries.
  • Piezoelectric Generator
  • No Batteries Required
  • Gold Plated Brass Contacts
  • Light Weight

  • Stock #
    Your Price
    AT138 Pocket Dosimeter/ 0 - 200 mR
    AT138S Pocket Dosimeter/ 0-2mSv
    AT909 Dosimeter Charger
    Dosimeter Charger (no batteries)

           Ludlum Pocket A/B/G Survey Meter.       

    Ludlum Measurements, Inc! The Ludlum Model 2401-P pocket sized Alpha, Beta, Gamma Survey Meter is an economical, portable and easy to use hand-held multipurpose survey meter. The 2401-P can be used for a wide range of Medical and Health Physics applications. This meter is great for measuring low level surface contamination of beta emitting isotopes, or for locating dropped or lost (therapeutic) seeds in the Radiology or Nuclear Medicine departments.

    INDICATED USE: Alpha, beta gamma survey.
    RANGE: 0-15 mR/hr; 0 - 50,000 cpm.
    DETECTOR: 2.1" (5.3 cm) diameter pancake GM.
    SENSITIVITY: Typically 3300 cpm/mR/hr (137Cs gamma).
    ENERGY RESPONSE: Energy dependent.
    RESPONSE TIME: Typically 8 seconds from 10% to 90% of final reading
    METER DIAL: 0-0.15 mR/hr; 0 - 500 cpm; BAT OK
    POWER: 1 each 9 volt battery
    BATTERY LIFE: Typically 250 hours with alkaline battery
    SIZE: 1.8" H x 3.3" W x 5.3" L (4.6 x 8.4 x 13.5 cm)
    WEIGHT: 0.9 lbs (0.4 kg) including battery
    ALARM: No

  • Model 2402 is the same model but includes External Probe connect.

  • Optional Model 44-9 GM Pancake Probe
    The Model 44-9's GM pancake type detector is arguably the most popular radiation detector used throughout the world. This detector is sensitive to alpha, beta and gamma radiation, is enclosed within a rugged metal enclosure, and is

    conveniently shaped and sized for checking contamination on people and objects. This detector operates between 85 to 1000 volts and is compatible with any Ludlum instrument capable of supplying 900 VDC and an input sensitivity of 30 mV or higher.

    Other Similar Models
    Model 44-40: Utilizes a lead housing to reduce background
    Model 44-9-18: Incorporates a gooseneck type flexible end with an extension handle stretching to 36" in length

    Alpha Beta Gamma Detector - Model 44-9-18 Specifications
    INDICATED USE: Alpha, beta, gamma survey; sample counting
    DETECTOR: Pancake type halogen quenched GM
    WINDOW: 1.7 + 0.3 mg/cm2 mica
    WINDOW AREA: 15 cm2 active, 12 cm2 open
    EFFICIENCY (4pi): 5%-14C; 22%-90Sr/90Y; 19%-99Tc; 32%-32P; 15%-239Pu
    SENSITIVITY (137Cs gamma): 3300 cpm/mR/hr
    ENERGY RESPONSE: Energy dependant
    BACKGROUND: 60 cpm
    DEAD TIME: 80 microseconds
    OPERATING VOLTAGE: 900 volts
    CONSTRUCTION: Painted aluminum housing
    SIZE: 1.8" H x 2.7" W x 23" L (4.6 x 6.9 x 58.4 cm) 36" fully extended
    WEIGHT: 1.5 lb (0.7 kg)

    Stock #
    Model Number
    Your Price
    Pocket A/B/G Survey Meter
    With NO external Probe Connector!
    Pocket A/B/G Survey Meter
    Same as 48-2875 above
    but with external Probe Connector
    GM Pancake Probe
    Energy Compensated GM Probe
    Handle for 2401/2402
    Air & Watertight Case for 2401/2402
    Nylon Carrying Case for 2401/2402
    1 uCi, 137Cs Check Source

           Fluke's Bleeper mR - Personal Radiation Monitor.       

    Fluke Biomedical, Inc. INTRODUCTION:
    The slim, compact Bleeper mR is the ideal personal monitoring device for alerting personnel to the presence of radiation in medical, industrial or research settings. It accurately measures and displays the radiation dose received.

    The only control is a switch to turn off and reset the instrument, making Bleeper mR extremely easy to use. For added safety, the switch is recessed. An easy-to-read LCD Display provides a continuous indication of accumulated dose. The loud "BLEEP" sounds every 15-30 minutes on background and becomes more frequent as dose rate increases, becoming a continuous sound in high radiation fields. A series of quiet "clicks" indicates it is properly functioning. Bleeper mR is an enhanced version of the highly popular Bleeper III and utilizes the same proven technology.

  • Continuously monitors radiation exposure and provides instant, accurate readings.
  • Measures "X" and gamma radiation.
  • Display can be easily read with the instrument in-pocket.
  • Sturdy casing with pocket clip protects against damage.
  • Features visible and audible "battery low" indicators.

  • Good energy and polar response...reliable readings match those from TLDs and film badges.
  • Recessed switch ensures the Bleeper mR cannot be turned off accidentally.

  • Bleep rates for background radiation: Approx. 1 bleep every 15-30 minutes.
    1 mR/h: approx. 1 bleep every 20 seconds.
    100 mR/h and above: continuous signal to at least 60 Sv/h (6000 R/h)
    Energy Range: 45 keV to 6 MeV (±25%)
    Dose rate response: Linear to 5 R/h (±20%)
    Display: LCD 0.1 mR to 999,999.9 mR
    Battery: Three alkaline batteries, size AAA. Typical battery life is 1 year.
    Temp. Range: -4°F to + 122°F (-20°C to + 50°C)
    Dimensions: 1.4(w) x 6"(d) (3.56 x 15.24 cm)
    Display area: 0.6 x 0.9" (1.52 x 2.29 cm)
    Weight: 0.25 lb (0.11 kg)

    Stock #
    Units of Measure
    Your Price
    mR (rads)
    µSv (sieverts)

           Fluke's Bleeper III - Personal Radiation Monitor.       

    Fluke Biomedical, Inc.
  • Provides a continuous indication of gamma or x-ray dose rate
  • Pocket-size and lightweight

  • Here is a simple, convenient instrument for alerting personnel to the presence of ionizing radiation. It provides a clear, audible indication of gamma and x-ray dose rates. No controls or adjustments are required.

    The instrument operates continuously, giving a bleep every 15 minutes for normal background radiation, increasing with the dose rate to a continuous tone when high radiation doses are present. This compact unit slips easily into the pocket, where it is firmly held by a clip.

    Sensitivity to background radiation: Approx. 1 bleep per 15 minutes.
    1 mR/hr: approx 1 bleep per 20 seconds.
    100 mR/hr and up: continuous signal (to at least 6000 R/hr)
    Energy Range: 30 keV to 10 MeV
    Temperature Range: -4°F to 122°F (-20°C to +50°C)
    Batteries: Two alkaline AAA. Battery life approx. 1 year
    Construction: Plastic case with clip
    Dimensions: 1 (w) x 5.5 (d) x 0.63" (t) (2.54 x 13.97 x 1.60 cm)
    Weight: 0.17 lb (0.08kg)

    Stock #
    Your Price
    Bleeper III Personal Radiation Monitor

           Fluke's Direct Reading, Pocket Dosimeters.       

    Fluke Biomedical, Inc. Available in a wide selection of ranges, to meet all of your requirements.
  • Low Leakage: Measures background.
  • Superior Energy Response: 20 keV to 2 MeV.
  • Rugged: Meet ANSI specifications N13.5 and N322.
  • Highly resistant to shock and vibration.

  • Direct-Reading Pocket Dosimeters from Nuclear Associates are rugged, precision instruments designed specifically for measuring accumulated quantities of gamma and x radiation. In use, the dosimeter is normally clipped to a pocket or to the outside of a lead apron. By checking the dosimeter reading periodically, the wearer is able to determine the exposure received during specific procedures. By knowing where and when greater-than-normal exposures occur, the wearer can identify the source and take quick, corrective action. Nuclear Associates currently offers five dosimeters. Each dosimeter has a color-coded clip that signifies its range. This will help the user to identify the dosimeter (i.e. black clip= 0-200 mR, blue clip= 0-5R, etc.), and ensure that the intended dosimeter is utilized.

    Nuclear Associates' Direct-Reading Pocket Dosimeters are extremely easy-to-use. To read the integrated exposure, the user looks through the dosimeter eye-piece while pointing the unit toward any external light source. The exposure is determined by the position of a hairline fiber against a graduated scale. A dosimeter Charger (model 06-912) is used to re-zero the dosimeter.

    The 0-200 mR Low-Energy Dosimeter is the most popular type for measuring personal radiation doses in hospital

    applications including fluoroscopy, portable radiography and angiography. Our high-energy dosimeters are ideal for nuclear medicine and health physics applications. All direct-Reading Pocket Dosimeters are hermetically-sealed using state-of-the-art plastics and epoxy resins. These reliable, high-quality devices meet ANSI specifications N13.5 and N322, as well as military requirements.

    Radiation Detected: Gamma and x-radiation from 20 keV to 2 MeV
    Ranges: 0-200 mR to 600 R
    Energy Response: See response curve below
    160 keV to 2 MeV: ± 10%
    40 keV to 160 keV: +20%, -10%
    20 keV to 40 keV: +20%, -30%
    Accuracy: Within + or -10% of true exposure
    Rate Response: Dose rate independent for gamma and x-radiation
    Electrical Leakage: Less than 0.5% of full scale for 24 hours at 50°C
    Relative Humidity: up to 90%
    Detector: Fiber electrometer mounted in an electrically-conducting plastic ion chamber
    Material: Detector Housing: Very low permeability plastics, hermetically-sealed. Clip: Glass fiber-filled, high-strength plastic
    Dimensions: Length: 4.5 (12.4 cm); Diameter: 0.6 (1.5cm)
    Weight: 1.0 oz (25 grams)

    Combo Dosimeter Charger and Storage Case Kit:
    Nuclear Associates' standard Dosimeter Charger (model 06-912) comes in a rugged leatherette-covered case that holds up to 12 dosimeters. A chart conveniently affixed inside the case permits quick identification of each dosimeter and its user. The charger can be easily removed for battery change.

    Dimensions: 9-1/2" L x 5-1/4" W x 5" H
    Weight: 5 lbs

    Dosimeter Charger:
    For zeroing all direct-reading dosimeters. This transistorized unit has a power supply that "zeroes" all direct-reading dosimeters. One standard 1.5V "D" cell permits thousands of operations. A safety spring in the charging socket prevents damage from excessive pressure on the dosimeter. Protective cap keeps the socket free of dust and moisture when not in use. 4" x 4" x 3" high (l0cm x 10cm x 7.6cm) 2 lbs.

    Stock #
    Your Price
    Direct-Reading Pocket Dosimeter, 0-200mR (Black Clip)
    Direct-Reading Pocket Dosimeter; 0-2 mSV (Black Clip)
    Direct-Reading Pocket Dosimeter; 0-5R (Blue Clip)
    Direct-Reading Pocket Dosimeter; 0-20R (Green Clip)
    Direct-Reading Pocket Dosimeter; 0-200R (Yellow Clip)
    Direct-Reading Pocket Dosimeter; 0-600R (Red Clip)
    Transistorized Charger alone (without Case).

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