4500 TLD Reader


This versatile start-up or add-on system is ideal for small or medium capacity applications in radiation protection, medical, research and high range dosimetry.

The Harshaw 4500 Manual TLD Reader provides versatile readout of TLD dosimeters. It incorporates both hot gas and planchet heating to read TLD cards, chipstrates, ringlets and unmounted dosimeters. Dual photomultiplier tubes and associated electronics enable it to read cards in two positions simultaneously. A start button and four indicator lights control and monitor the operation. The Model 4500 connects via a serial interface to an external PC, as illustrated, which provides control over the setup, time-temperature profiles (TTPs), analysis and data recording. Additional applications packages are available.

Performance Highlights

  • Reads 2-, 3-, or 4-element cards and extremity carrier cards using hot gas heatingsmall_4500 drawer.jpeg 
  • Reads single TLD chips, rods or powders using contact planchet heating
  • Card elements are read in pairs. The pairs of a 4-element card are sequenced automatically
  • Interfaces with WinREMS and software options such as Dose Algorithms, Glow Curve Analyzer, Chain-of-Custody and Health Physics Records System
  • Easy to integrate into existing TLD systems with minimum additional training
  • System hardware and software expansions can be transparent to the user, and maximize the utility of purchased items 
Specification for TLD Model 4500 Manual Readers
Processing Time: For chipstrates or two-element cards, <35 sec.; for DXT-RAD or four-element cards, <1 min.
Dynamic Range: Seven decades
Linearity: <1% deviation, above 2 x dark current
Test Light Stability: <0.5% short-term variability based on one standard deviation of 10 consecutive measurements
High Voltage: <0.005% short-term variation
Radiation Types and Energies: Photons>1 keV, neutrons, thermal energy to 100MeV, betas>70 keV
Operating Temperature: 0° to 40°C (32 to 104°F)
Storage Temperature: -10° to +60°C (14° to 140°F)
Humidity: After 24 hr. exposure to 95% RH, within specifications after 6 hr.
Light Intensity: Withstands 1000 lux with cover fitted
Dimensions:  370H x 460W x 500mm D (14.75H x 18.25W x 20.5 in.D)
Weight: 35kg (77.5 lb)
Stability: <1µGy standard deviation for 10 readings of background
Dose-ralated figures apply to TLD-100 (LiF:Mg, Ti) material.