Engineering Overview

Through-side Well NaI(Tl) Scintillator

Through-side Well NaI(Tl) Scintillator is a hermetically encapsulated sodium iodide crystal with a through-side hole for continuous sample, pipe or passing-source measurement. ATR Crystal supplies standard through-side well models from 40 x 40 mm to 75 x 75 mm crystal size with K9 glass optical windows and listed detection efficiency from >=75% to >=80%.

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Through-Side Well NaI(Tl) Scintillator for Continuous Sample Monitoring

Through-side Well NaI(Tl) Scintillator is a hermetically sealed sodium iodide scintillator with a through-side hole passing across the crystal geometry. This structure is used when a sample tube, source path, pipe or moving specimen must pass through the detector region for continuous or repeatable measurement.

The through-side design is useful for continuous flow monitoring, pipe monitoring, fuel rod or sample scanning, radioimmunoassay-related geometries and other detector systems where end-well insertion is not suitable. Final efficiency depends on hole diameter, crystal size, source distribution, sample path, shielding and readout design.

ATR Crystal supplies through-side well NaI(Tl) scintillators with aluminum or stainless steel housing options, K9 glass, quartz or sapphire optical windows, custom hole dimensions, flanges and mounting features. Because NaI(Tl) is hygroscopic, reliable hermetic encapsulation is required.

Applications of Through-side Well NaI(Tl)

Continuous flow radiation monitoring

Pipe and tube sample measurement

Fuel rod or passing-source scanning systems

Radioimmunoassay-related detector geometries

Low-level gamma-ray monitoring

Custom PMT-coupled well detector assemblies

Features of Through-side Well NaI(Tl)

Through-side sample pathA side hole allows tubing, source path or sample holders to pass through the scintillator region.
High listed efficiencyStandard models list detection efficiency from >=75% to >=80%, depending on size and geometry.
High light outputNaI(Tl) provides high scintillation light output for PMT-coupled gamma detection.
Good energy resolutionNaI(Tl) is widely used where gamma-ray counting and moderate spectroscopy performance are required.
Hermetic encapsulationAluminum or stainless steel housing protects the hygroscopic NaI(Tl) crystal.
Custom hole and housing optionsHole diameter, path position, flange, window and mounting details can be reviewed by drawing.

Typical Specification

Model	Crystal D1	Crystal H	Hole Dia.	Outer D2	Outer L	Aperture d	Encapsulation	Detection Efficiency
NaI-D40H40-SH20	40 mm	40 mm	20 mm	45 mm	47 mm	19 mm	Aluminum housing with K9 glass window	>=80%
NaI-D50H50-SH25	50 mm	50 mm	25 mm	56 mm	57 mm	24 mm	Aluminum housing with K9 glass window	>=75%
NaI-D75H75-SH35	75 mm	75 mm	35 mm	81 mm	82 mm	34 mm	Aluminum housing with K9 glass window	>=75%

Note: other sizes or specifications can be customized according to your requirements.

Through-side Well vs. Related NaI(Tl) Geometries

Product	Best Fit	Main Advantage	Design Notes
Through-side Well NaI(Tl)	Continuous flow, pipe or passing-source monitoring	Side through-hole sample path	Hole diameter and path alignment are critical.
End Well NaI(Tl)	Small vial or sample counting	End well gives high geometric efficiency for inserted samples	Well depth and sample vial size should be specified.
General Encapsulated NaI(Tl)	Standard gamma detection	Cylindrical detector format	No sample-through geometry.
Square Type NaI(Tl)	Detector arrays and rectangular layouts	Square/cuboid geometry	Useful when packing geometry matters.

Through-side Well NaI(Tl) RFQ Checklist

RFQ Item	Information to Provide
Application	Flow monitoring, pipe measurement, passing-source scan, sample counting or custom detector.
Sample path	Tube diameter, source path, sample geometry, alignment requirement and expected count rate.
Crystal and hole	Crystal diameter/height, hole diameter, aperture, outer dimensions and tolerance.
Encapsulation	Housing material, optical window, flange, connector and mounting requirement.
Performance target	Detection efficiency, energy resolution, background requirement and test source.
Order information	Quantity, drawing, inspection report and delivery schedule.

Frequently Asked Questions

What is a through-side well NaI(Tl) scintillator?

It is a sealed NaI(Tl) detector crystal with a side through-hole that allows a tube, sample path or source path to pass through the detector geometry.

How is it different from end-well NaI(Tl)?

End-well NaI(Tl) accepts a sample from one end. Through-side well NaI(Tl) has a side path through the detector, making it useful for continuous or passing-sample measurement.

What efficiency is listed?

The original standard models list >=80% for NaI-D40H40-SH20 and >=75% for the larger listed models, depending on geometry and measurement condition.

Can the through-hole size be customized?

Yes. Hole size, crystal size and outer housing dimensions can be reviewed according to sample path, tube diameter and detector design.