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  Harshaw TLD Model 4500, Manual reader


The 4500 Manual TLD Reader provides versatile readout of Harshaw TLD dosimeters and is ideal for small or medium capacity applications in radiation protection, medical, research and high dose range dosimetry.
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The Model 4500 connects via a serial interface to an external PC, which provides control over the setup, time-temperature profiles (TTPs), analysis and data recording. A start button and four indicator lights control and monitor the operation. Additional applications packages are available.

Performance Highlights

  • Reads 2-, 3-, or 4-element cards and extremity carrier cards using hot gas heating
  • 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 and Health Physics Records System
  • Easy to integrate into existing Harshaw TLD systems with minimum additional training
  • System hardware and software expansions can be transparent to the user, and maximize the utility of purchased items
  • All PC functions are external to the reader
    - Minimum initial reader investment
    - External PC can be used for other applications
    - Capacity to improve system performance as PC upgrades become available
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Purchase Details
SKU : Harshaw TLD 4500 
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Specifications:
Note: :Dose-related figures apply to TLD-100 (LiF:Mg,Ti) material
Manual operations :Load dosimeter, select group file, define setup, define acquisition parameters, enter dosimeter identity, start readout
System operations :Apply TTP, associate light output with dosimeter identity, store result, index to second element - pair
Processing times :For chipstrates or 2-element cards, <35 s
For DXT-RAD or 4-element cards, <1 min
Dynamic range :Seven decades
Linearity :<1% deviation , above 2x dark current
Test light stability :<1% short term variation based on 1 standard deviation of 10 consecutive measurements.
High voltage :<0.005% short term variation
Radiation types and energies :Photons > 1 keV, neutrons, thermal energy to 100 MeV, betas > 70 keV
Reference light :Electronic, temperature stabilized, blue LED
Time temperature profiles (TTPs) :Pre-heat, 0 to 100 s, ambient to 200 °C,
Linear ramp, 1 °C/s to 30 °C/s
Maximum temperatures :300 °C, Teflon cards
400°C, Kapton cards
600°C Planchet heating
Post-read anneal, 0 to 99 s, up to maximum temperature
Dose range :10 µGy (1 mrad) to 1 Gy (100 rad) linear
1 Gy (100 rad) to 20 Gy (2000 rad) supralinear
Dose stability :<1 µGy standard deviation for 10 reads of background
Batch uniformity :±30% for uncorrected cards
3 month fading: <5% with correction, (<20% without)
Dark current :<50 µGy, 137Cs equivalent dark current
Threshold :<10 µGy (mrad) 2.26 standard deviations for 10 unexposed dosimeters
Residual signal :<0.2% of reading without annealing
Repeatability :<2% variation at 1mGy (100 mrad) 137Cs
Reusability :500 reuses for cards (<10% overall change)
50 reuses for EXT-RAD and DXT-RAD
Operating temperature :0 to 40 °C
Storage temperature :-10 to +60 °C
Humidity :After 24 hr exposure to 95% RH, within specs. after 6-hr recovery
Light intensity :Withstands 1000 lux with cover fitted
EMC compatibility :CE-marked, EN-50082-2 & EN-55011 group1 class B
Low Voltage Directive compliant
External connections :100 - 120 or 220 - 240 V ac ±10%; 50/60 Hz. Regulated gas supply. RS-232 Serial link
Dimensions :370 H x 460 W x 500 D mm
(14.75" H x 18.25" W x 20.5" D)
Weight :35 kg (77.5 lb)