The most advanced, transportable and user-friendly LSC on the market


The Hidex 300 SL is a revolutionary instrument which incorporates the most advanced technology available, triple-to-double coincidence ratio (TDCR) counting. TDCR utilizes a unique design with three photomultiplier detectors aligned 120 degrees from each other, which offers superior efficiency and counting results for both advanced research and environmental work.


The 300 SL has a modern and compact design measuring half the size and weight of some of its long standing rivals. It is therefore much easier to fit it into smaller, more space conscious laboratories, such as transporting in research vessels or mobile labs.

Hidex’s MikroWin software version 5.62 is fully compatible with Windows 11

Hidex is the only manufacturer of liquid scintillation counters whose software is fully compatible with Windows 11, Microsoft’s latest major release. Hidex’s MikroWin version 5.62 can be run on any external desktop, whereas other manufacturers use internal computers that are integrated into the liquid scintillation counter itself.

This can present problems if there is a fault with the internal computer, as it prevents the user from operating the instrument as well. Being able to use an external desktop to manage your instruments allows MikroWin software to be easily updated with new releases and is compatible with Microsoft’s latest security features introduced in Windows 11.

Super Low-Level Model

Similar to the standard instrument the Hidex 300 SL super low-level scintillation counter is equipped with additional lead shielding, low-level PMT detectors, and an active guard detector for further background reduction.

Ideal for 3H in water measurements, other low-level environmental monitoring, radiocarbon dating and biofuel verification.

New Active Guard
The Active Guard is a separate scintillator detector which measures and subtracts real-time background radiation. The guard can be turn off for high energy samples and does not interfere with alpha/beta separation.

TDCR Technology

The 300 SL utilizes a unique design with three photomultiplier detectors aligned 120 degrees from each other, which offers superior efficiency and counting results for both advanced research and environmental work.

In addition, the 300 SL can be used in triple coincidence mode only, which removes interference from chemiluminescence and the need to dark adapt. The counter can also be operated in dual coincidence mode using conventional standards and quench correction methods.

Quench curves can be generated and stored within the MikroWin software, which can be automatically applied or manually fitted to recalculate previous data.

Detector Design

Optimal Lead Shield Design

A minimum of 70 mm lead in all directions provides excellent shielding and minimizes instrument weight.

Lead Shutter
Reduces cosmic radiation.

Copper Shielding
Eliminates X-rays from lead shield.

Measurement Chamber
Highly reflective proprietary paint maximizes photon detection.

Robotic Loading Arm
Removes the need for a complex elevator mechanism, preventing jams, and is easily serviceable.

Three PMTs detectors in coincidence mode provide optimal counting geometry and facilitate TDCR calculations.

No internal or external standard source

The TDCR method allows easy determination of sample counting efficiency without the use of any internal or external standard source of radioactivity, offering many benefits for the modern lab including no hidden disposal costs, no health hazard when servicing, and no transportation restrictions.


  • Temperature Control Module
  • Alpha/Beta Separation Module
  • Low-Level PMT Detectors
  • Digital Lead Shield
  • External EU-152 Standard

The 300 SL uses an external PC which is Windows 7 and 8 compatible, enabling several users to transfer their method and data files to other offline or networked PC’s.

The MikroWin 300 SL software features an easy-to-use graphical interface and advanced data reduction capabilities. An unlimited number of protocols, easy export to Excel™, custom calculations and quench curves are all included. MikroWin also has options for 21 CFR Part 11 compliance for secure handling of method and data files.

Hidex 300 SL existing users

Click the tabs below to learn more about our customers and their applications for the Hidex 300 SL.

University of Surrey, UK

Quantifying radiolabelled CECs

Hidex instruments are being used by the University of Surrey’s Applied-RadioIsotope and Environmental Laboratory (ARIEL) to research and understand the fate and behaviour of contaminants of emerging concerns (CECs). CECs are pollutants such as domestic chemicals, pharmaceuticals, and agricultural runoff detected in bodies of water.

Lead by Dr. Maya Al Sid Cheikh, the research is specifically concerned with nanoplastics, which are ubiquitous in domestic products and discharged in large quantities from industrial processes and can have devastating impacts on biodiversity, ecosystems, and food chains. Maya and her team at ARIEL are trying to trace these from origin through to dispersion in the environment and living organizms to understand how long they persist by 14C radiolabeling.

You can find out more about ARIEL's research by clicking the button below.


Colorado School of Mines, USA

Radiometric analysis of heavier actinides

The Colorado School of Mines is a public R1 research university focused on applied science and engineering. The Mines Radiochemistry Lab uses radioactive elements to solve complex problems in nuclear energy, the separation and purification of metals, the disposal of nuclear waste, and the environment.

The school’s lab is also one of only two university labs in the world that experiments with rare and highly radioactive heavy actinide elements such as Berkelium, Einsteinium, and Fermium. Research Assistant Professor Jessica Jackson has been using the Hidex 300 SL for a range of radiometric analysis experiments using alpha-beta discrimination. The LSC’s unique topographical 3D separation was a key reason why the school procured the Hidex over another model.

Click the button below to find out more.


Babcock Marine, UK

The decommissioning of Royal Navy nuclear submarines

Radiochemists at Babcock Marine's Rosyth Radiochemistry Laboratory (RCL) have been using the Hidex 300 SL to determine tritium and carbon-14 in samples as part of the Ministry of Defence’s Submarine Dismantling Project. The RCL is responsible for analyzing environmental samples from both the Rosyth Dockyard itself and the decommissioned submarines berthed there.

Click the button below to find out what Radiochemist Lionel Serafini thinks of the 300 SL.


Watts Bar Nuclear Power Plant, USA

Advanced tritium analysis at nuclear power stations

Three Hidex 300 SL liquid scintillation counters have been installed at the Tennessee Valley Authority’s Watts Bar nuclear power plant where it is used by the Chemistry Department to count tritium in various plant samples, including gaseous and liquid effluents. The NPP generates enough electricity for 1,200,000 homes.

We spoke to Radiological Chemist Brooke Underwood. Click the button below to find out what she had to say.



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