Harshaw TLD™ Model 3500 Manual Readers

The HARSHAW TLD Model 3500 Manual Reader includes a sample drawer for a single element TL detector, a linear, programmable heating system, and a cooled photomultiplier tube with associated electronics to measure the TL light output. Planchet heating incorporates a welded thermocouple for best temperature reproducibility. The operational software, Thermo Scientific™ WinREMS™, which runs on a separate computer, provides the user interface, the reader control and the applications software.

• Multiple, programmable, linear heating cycles such as pre-read anneal, acquire and post-read anneal cycles.
• Typical cycle time per detector: typically 30 seconds.
• Heating temperature capability up to 400°C (standard model) or 600°C (high-temperature version).
• Thermoelectric PMT cooler for maximum gain stability.
• Seven decade glow curve acquisition range.
• Options include glow curve deconvolution software (WinGCF Software), various types of neutral density filters to extend the high measurement range, and TL element specific planchets for best possible reproducibility.
• Easy to operate, service and maintain.
• Size: 31 × 32 × 47cm.
• Weight: 25kg.

Dosimetry Performance Using LiF:Mg,Ti (TLD-100/600/700):

• Nearly tissue equivalent.
• Radiation types: photons (E>5 keV), electrons (E>70 keV), neutrons (from thermal energies up to ∽100 MeV, TLD-600 only).
• Measurement range: 10 µGy to 1 Gy (linear), 1 Gy to 20 Gy (supralinear).
• Detection threshold: <10 µGy based on 2.26 standard deviations for 10 sequential readings of an unexposed dosimeter.
• Repeatability: Less than 2% variation based on one standard deviation for 10 sequential measurements of 1 mGy ¹³⁷-Cs
• Residual TL signal: <0.2% of reading
• Fading: <20% in 3 months without thermal treatment; <5% in 3 months using pre-read anneal or glow curve deconvolution software (WinGCF Software).
• Batch uniformity: ±30% from the factory standard.
• Reuse: typically >500.

Instrument Performance:

• Dynamic range: 7 decades.
• HV stability: ±0.005% per hour, ±0.02% per 8 hours.
• Linearity: better than 1%.
• Test light: temperature-stabilized LED.
• Electrical supply: selectable, 110/120VAC ±10%, 60Hz or 220/240VAC ±10%, 50Hz
• Nitrogen supply:
  Purified (99.995%), dry
  Pressure: 1.5 to 3kg/cm²
  Flow Rate: 130 liters/h, subject to external regulation
  Note: The use of nitrogen is optional. Absence of nitrogen will result in understated performance.
• Operating temperature: 15° to 40°C
• Storage temperature: -10° to 60°C
• Humidity: Functions within specification after 24 hour exposure to 90% humidity and subsequent 6-hour recovery with use of the nitrogen supply
• Ambient light exposure: Functions within specifications when exposed to ambient light up to 1,000 Lux with cover on the reader
• Shock: Withstands a 1-cm drop onto a concrete surface

Ordering Alerts:

Computer requirements: Any commercially available PC system with Windows™ 7, XP, 2000, or NT 4. 32 bit OS only. RS232 strongly recommended. (Please contact your sales representative for approved USB to RS232 converters).

Compatible with:

Thermo Scientific TLD Materials, Thermo Scientific TLD Accessories

Recommended for:

Treatment planning verification, diagnostic dose studies, quality assurance, whole body dosimetry, extremity dosimetry, environmental dosimetry, high dose applications (radiation hardness testing), irradiated food analysis, dating, and many more.