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Monitoring the extremities is extremely important when handling radiopharmaceuticals, in cardiology, oncology and glove box work as whole body dose may underestimate the extremity dose, especially when there are high dose gradients.  

The ED3 Active Extremity Dosimeter provides monitoring of Hp(0.07) for betas and photons (gammas and X-rays) on the extremities.

Probes come precalibrated and are interchangeable on the ED3 electronics unit.


  • Interventional Radiology
  • Radiation Therapy
  • Nuclear Medicine
  • Glove Box Applications
  • High Dose Gradient Environments


  • Real time monitoring for dose of record or ALARA
  • Better dose assessment in high dose gradients
  • Easy to wear
  • Dose chain of custody
  • Facilitates training

Key Characteristics

  • Real-time readout for 1—2 detectors
  • Measures Hp(0.07) for betas and photons
  • Detectors are removable for decontamination
          or replacement
  • Collected data many be analyzed, stored and
         archived on a PC using the included software
  • May be adapted for Eye dosimetry Hp(3)

Self Test and Alarms

  • Low Battery
  • Missing Probe
  • Dose & Dose Rate Alarm
  • Dose & Dose Rate Overload

​​Part Number + Description

Part Number          Description

ED3                       Active Extremity Dosimeter for monitoring, collecting, and displaying data from 1 or 2 detectors (must be the                                 same type). Supplied with 1 x ED3D1 detector, PC software ED3 Data Manager. An ED3D4 may be 
                              substituted for the ED3D1 detector.

ED3D1                   Detector designed to measure Hp(0.07) for photons from 60 KeV to 1.25 MeV.​

ED3D4                   Detector designed to measure Hp(0.07) for betas and photons below 60 KeV.
                               *Lower energies are possible, but response variability may increase.​

ED3 Calibration    Calibration of the ED3 with probes.
Active Extremity Dosimeter
Extremity Dosimeter Specifications
Energy Range
Low Energy Photons    33 KeV - 60 KeV
       ⁹⁰SR                         0.31 relative to ¹³⁷CS
       ⁸⁵KR                         negligible relative to ¹³⁷CS
High Energy Photons   60 KeV - 1.2 MeV
Effective Dose Rate      0.0 - 99.9 mSv/h
Range                             0.0 - 9.99 rem/h 
Size & Weight              99 x 60 x 35 mm - 245 g
                                       [3.89 x 2.36 x 1.37 inches - 8.6 oz]
Environmental             IP53
Display                         16 x 2 character LCD
Battery Life                  Over 60 hours per charge with 
(Rechargeable)            normal use
​Effective Dose Range   1.0 μSv - 999.9 mSv
​                                        0.1 mrem - 99.99 rem 
Serving the External Dosimetry, Radiation Detection, and Spectroscopy communities since 2012.
Designed by Rotunda Scientific Technologies™ LLC © 2012-2018
Request more information about the ED3!
ED3 Active Extremity Dosimeter
  • Easy to wear
  • Real-time dose monitoring
  • Measures Hp(0.07) for betas and photons
  • Removable detectors