Active Extremity Dosimeter

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

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.

  • Real-time readout for 1—2 detectors*
  • Real-time monitoring for ALARP
  • Measures Hp(0.07)
  • Detectors are removable for decontamination or replacement
  • Software included for data analysis
  • Better dose assessment in high dose gradient environments
  • Facilities training
  • Detectors come pre-calibrated & are interchangeable on the ED3 unit

* Detectors must be of the same type.

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

The ED3 Electronic Dosimeter has been designed to operate, display and collect measurement readings from 2 detector types, Probes come pre-calibrated and are interchangeable on the ED3 electronics unit:

D1 – Suitable for most Hp(0.07) extremity dose equivalent requirements in Medical Physics & Glove Boxes

D4 – Suitable for some X-ray Hp(0.07) extremity dose equivalent requirements in Medical Physics & Glove Boxes

Probe D1 D4
Radiation Measured Gamma Gamma, X-ray and beta
Dose Range 0.0 μSv to 1 Sv Hp(0.07) 0.0 μSv to 1 Sv Hp(0.07)
Dose Rate Range 0.0 μSvh⁻¹ to 100 mSvh⁻¹ Hp(0.07) 0.3 μSvh⁻¹ to 100 mSvh⁻¹ Hp(0.07)
Energy Response 60 keV to 1.25 MeV X-rays – 33keV to 60keV
Detector 2x Silicon diodes 2x Silicon diodes
Active area of detectors 7.0mm² 7.0mm²
Temperature Range ±20% from 0ºC to 40ºC ±20% from 0ºC to 40ºC
Maintenance Annual calibration & physical checks Annual calibration & physical checks
Lead length 1.4m 1.4m
Beta Response - 90Sr + 90Y Beta response: 0.31 of true beta dose Hp(0.07)
  • 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


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

The ED3 is RoHS compliant, but the D1 probe is exempt (Annex IV – Lead,  cadmium and mercury in detectors for ionising radiation.)

Component suppliers provide individual certificates for all the ic’s, passive components etc. but there is no separate certificate for the completed product, this is covered by the CE mark.

Authorised Representative (EU)2019/1020:
Authorised Representative Service, 77 Camden Street Lower, Dublin, D02 XE80, Ireland

This is the current version information for the ED3 system.

  • Quick Start Guide Version:- 1.2.1
  • User Guide Version:- 2.3
  • ED3 Firmware Version:- 2.10
  • ED3 PC Application Version:- 2.6

Please contact JCS for download links if you need an updated version of any of the above.

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