STATE OF ART INSTRUMENTATION FROM AN INNOVATIVE COMPANY
PC CONTROLLED OSL RESEARCH READER TYPE:OSL-1007
PC Controlled OSL Research Reader OSL 1007 manufactured by Nucleonix systems, is a compact integral unit, designed primarily to meet the requirements of OSL research community in R&D labs & universities who are engaged in luminescence studies of OSL materials. The drawer & sample holder of this system facilitates, single sample OSL acquisition & analysis, at a time.
System has precisely designed stimulation & detection opto- electronics & photon counting module with appropriate filters, focusing lenses & sample drawer assembly all enclosed in a single mechanical chamber. System facilitates loading of the OSL samples on to kanthal strip. For OSL samples separate cups/ planchets can be provided.
OSL data acquisition & analysis is controlled by PC software. In case of OSL, optical stimulation by BLUE & GREEN LEDs provided is also controlled by PC software and electronic circuits &embedded code in the microcontroller. Photon counting module acquires luminous intensity data for OSL samples. Two modes of OSL stimulation have been provided in this system namely.
I. OSL Stimulation & Detection chamber It is a light leakage free, precisely fabricated mechanical assembly, houses photon counting module with detection filter basket, LED stimulation assemblies (four) diagonally placed around photon counting module cylindrical enclosure. OSL sample holder with kanthal heater strip & drawer arrangement are also built-into this chamber.
II. Optical Stimulation Assembly
Optical Stimulation System consists of BLUE & GREEN LED cluster(s) with, each LED of 3 watt power. Either BLUE or GREEN LED cluster(s) each cluster containing two LEDs can be stimulated. These LEDS are placed diagonally 1800 opposite, with suitable lense arrangement, provides uniform luminous intensity onto the sample area.
Light Source (s): (i). Blue LEDs clustor, each of 3 watt output placed 1800 degrees opposite gives stimulation output with peak wavelength emission of 465nm, having Luminous flux radiometric power of 30mW @ 700ma & emission wave length band is (460-470)nm.
(ii). Two Green LEDs clustor has peak wavelength emission of 525nm and gives 99mW radiometric power @ 700mA. Emission wavelength band is (520 -535) nm.
Constant Current Driver: Electronic circuits built-in provide Constant current drive to each of the LED clusters with dimming control, to vary the luminous intensity. Correction for LED output intensity variation has been implemented against temperature.
Stimulation Filter: Each of the LEDs assembly is provided with a long pass, stimulation filter of 420nm of 12.5nm dia. This prevents the scattering light below 420nm, entering the PMT directly.
Focusing Lense: A suitable focusing Plano-concave lense is provided in front of the LEDs to focus the light on to the OSL samples placed in the planchet.
Heat Sink: Each of the LED assembly has been provided with a specially designed Heat sink (cylindrical) to keep the LED at lower temperature to obtain uniform illumination, onto the sample holder.
Photo Diode / Photo sensor: A suitable photo diode, with appropriate electronics is used for plotting the stimulation intensity in CW/LM modes.
Stimulation modes provided:
(i) CW-OSL-continuous wave OSL
ii) LM-OSL Linearly modulated OSL
III. OSL READER- Light Detection System / Photon Counting Module: Photon counting module, is an integral part of the OSL Reader. Photon counts received from the luminescence emission from the OSL materials are counted in this module & the data counts are transferred to PC, thru RS232 interface. This module essentially is plug-and play photo detector package, comprises of selected 25mm diameter end window PMT, a positive high voltage power supply, high speed amplifier- discriminator, counter & a microcontroller. All these are encapsulated with in a cylindrical mumetal case providing a high level of external magnetic shielding.
PMT: 25 mm PMT with ultra low dark counts.
Count rate capacity: 100 MHz
High Voltage: Built –in & set to optimum value.
PC Interface: RS 232 serial port.
IV. PC Configuration : Branded computer system with Intel Core i3 @ 3.06Ghz, 2GB DDR2 RAM, 500GB SATA, DVD R/W, Keyboard and Internal ready Optical scroll, 19” TFT Monitor, Laser jet printer, Windows licensed OS-Windows 7.0.
V. Software features:
OSL reader system operates thru PC controlled user friendly software. Software performs Self diagnostics of the system & reports faults. Software facilitates one to choose OSL mode for sample data acquisition, allows the user to configure for the required heating profile in other parameters as required in OSL mode. Once data is acquired, acquired data can be saved or further processed depending upon the requirement.
LiMgPo4:Tb, B Glow curve acquisition CW-OSL Mode
LiMgPo4:Tb, B Glow curve acquisition LM-OSL Mode
CW-OSL Performance study
Mode Selection: OSL Green / OSL Blue. In OSL, Continuous Wave (CW) & Linear Modulated (LM) modes are available.
Light Stimulation Profile: Light stimulation profile can be configured for CW or LM modes.
Acquisition: Data is acquired based on the selected Mode & Profile. Background spectrum / Sample data can be acquired.
Background Subtraction: There is a provision to do background subtraction automatically during acquisition.
Export Spectrum data to Excel: Software allows the spectrum data to be exported to Excel, which gives the convenience to the user for further processing.
Spectrum overlap: Multiple spectra can be overlapped (up to 10) for comparative studies.
Spectrum subtraction: 2 spectra can be mutually subtracted & resulting spectrum can be saved.
Help: Software manual is provided which gives installation & usage instructions clearly.
OSL Phosphor Characterization, Medical Dosimetry, Personal Monitoring Research, Archeology dating, Environmental Radiation Monitoring, Medicine, Biology, Neutron Dosimetry, Reactor Engineering, standardization and inter comparison of OSL dosimeters used in personnel monitoring etc.
Applications in radiation oncology: Therapy machine calibration checks & inter-comparison studies with other centers, treatment planning accuracy verification using phantoms, patient specific dosimetry, studies in Brachytherapy physics, in Xray diagnostics to determine absorbed doses to patients & in research etc.
Plot No.162 A & B, Phase-II, IDA, Cherlapally, Hyderabad-500051 India Phone:+91-40-27263701,27262146,040-68888777, Fax : 040 - 27262146
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