Engineering Overview

X-Ray Type NaI(Tl) Scintillator

X-Ray Type NaI(Tl) Scintillator is a thin disk-shaped encapsulated NaI(Tl) crystal designed for soft X-ray and low-energy gamma-ray detection. ATR Crystal supplies NaI(Tl) disks with K9 glass optical windows, beryllium or aluminum entrance windows, 1 mm crystal height and

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X-Ray Type NaI(Tl) Scintillator for Soft X-Ray and Low-Energy Gamma Detection

X-Ray Type NaI(Tl) Scintillator is a thin disk-shaped encapsulated sodium iodide detector crystal designed for soft X-ray and low-energy gamma-ray measurement. It uses a thin NaI(Tl) crystal with a low-attenuation entrance window so lower-energy photons can reach the scintillator more effectively than in standard thicker-window detector packages.

The standard listed models use a 1 mm crystal height with 25.4 mm, 38.1 mm or 50.8 mm diameter options. A beryllium or aluminum entrance window can be reviewed according to photon energy, mechanical strength, safety handling, detector housing and regulatory requirements.

ATR Crystal supplies X-ray type NaI(Tl) scintillators for low-energy photon counting, soft X-ray detection, low-level gamma monitoring, laboratory instruments and custom detector modules. Crystal diameter, window material, entrance-window thickness, housing, optical window, flange and readout interface can be reviewed by drawing.

Applications of X-Ray Type NaI(Tl)

Soft X-ray detection and counting instruments

Low-energy gamma-ray measurement

Am-241 60 keV reference-source measurements

Laboratory low-energy photon detector modules

Environmental and radiological survey instruments

Custom PMT-coupled low-energy detector assemblies

Design Options

Design Item	Available Option	Engineering Notes
Metal container	Aluminum or stainless steel	Selected according to weight, mechanical strength, mounting and operating environment.
Optical window	K9 glass, quartz or sapphire	Used on the readout side for optical coupling to PMT or other sensor.
Entrance window	Beryllium or aluminum	Chosen according to low-energy photon transmission, mechanical requirement and handling constraints.
Crystal geometry	Thin disk NaI(Tl)	Typical listed height is 1 mm for low-energy photon response.
Custom mechanical options	Special flanges, mounting fixtures or other modifications	Provide drawing for review.

Features of X-Ray Type NaI(Tl)

Low-energy photon accessThin entrance windows help reduce attenuation for soft X-rays and low-energy gamma rays.
Thin disk geometryThe 1 mm crystal height supports low-energy photon detection where a thick crystal is not required.
Hermetic encapsulationNaI(Tl) is hygroscopic, so the crystal must be sealed in a suitable housing.
PMT-compatible outputNaI(Tl) emission is well matched to common photomultiplier tubes.
Custom entrance windowBeryllium and aluminum window options can be reviewed for the target photon energy.
Standard models available25.4 mm, 38.1 mm and 50.8 mm diameter reference designs can speed up specification.

Typical Specification

Model	Diameter	Height	Encapsulation	Energy Resolution, Am-241
NaI-D25H1	25.4 mm	1 mm	Aluminum housing, K9 glass window, beryllium entrance window	<=18% at 60 keV
NaI-D38H1	38.1 mm	1 mm	Aluminum housing, K9 glass window, beryllium entrance window	<=18% at 60 keV
NaI-D50H1	50.8 mm	1 mm	Aluminum housing, K9 glass window, beryllium entrance window	<=18% at 60 keV

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

X-Ray Type NaI(Tl) vs. Related Encapsulated Scintillators

Product	Best Fit	Main Advantage	Design Notes
X-Ray Type NaI(Tl)	Soft X-ray and low-energy gamma detection	Thin disk crystal with low-attenuation entrance window	Window material and thickness are critical.
General Encapsulated NaI(Tl)	Standard gamma detection and spectroscopy	Mature cylindrical PMT-coupled detector format	Not optimized for very low-energy photons unless window is specified.
Square Type NaI(Tl)	Rectangular detector arrays	Square/cuboid packing geometry	Best when mechanical layout requires rectangular crystals.
LaBr3(Ce)	High-resolution gamma spectroscopy	Better resolution and faster timing than NaI(Tl)	Hygroscopic and has intrinsic La-138 background.

X-Ray Type NaI(Tl) RFQ Checklist

RFQ Item	Information to Provide
Application	Soft X-ray, low-energy gamma, Am-241 measurement, survey instrument or custom module.
Photon energy	Target energy range, source, required threshold and measurement geometry.
Crystal size	Diameter, thickness, tolerance and preferred standard model if applicable.
Entrance window	Beryllium or aluminum, window thickness if specified, and safety/handling requirement.
Readout	PMT or other sensor, optical window, coupling and electronics interface.
Order information	Quantity, drawing, inspection report and delivery schedule.

Frequently Asked Questions

Why use a beryllium entrance window?

Beryllium is used in low-energy photon detectors because it can provide lower attenuation than many thicker or higher-Z window materials. Final suitability depends on photon energy, window thickness and safety requirements.

Can aluminum be used instead of beryllium?

Yes. Aluminum entrance windows can be reviewed, but low-energy transmission depends strongly on window thickness and target photon energy.

What energy resolution is listed for standard models?

The listed standard models specify <=18% at Am-241 60 keV.

Does X-ray type NaI(Tl) still need sealing?

Yes. NaI(Tl) is hygroscopic and must be hermetically sealed, even in thin disk X-ray detector designs.