LOW VOLTAGE SUPPLY: +15V, -15V, +24V & 5V are generated in LV PCB, to powerup all the circuits.
HIGH VOLTAGE SUPPLY:
(0 to 1500V) @ 1mA HV is adjustable by a ten turn the helipot & dial.
a. HV Output : Positive polaritis
b. Ripple & noise : Low the 25mV
c. Regulation : Better than 0.5%
LINEAR AMPLIFIER PCB
a. Input Polarity : Positive or Negative
b. Total Gain (Typical) : 600 (Approx.)
c. Ouput (Bipolar) : 0V to 8V (usable recom mended Linear range)
d. Max.Output : 12V (Saturation Level)
e. Shaping : 1µsec
SINGLE CHANNEL ANALYSER PCB :
a. Input : Unipolar or Bipolar with a +ve leading edge 0 to 10V
b. Output Pulse Polarity: Positive
Pulse Amplitude : +5V
Pulse Width : 0.5 micro sec
c. LLD output pulse amplitude: +5V
Output pulse width : 0.5 micro sec
Base line variable by : 10 turn helipot / Dial
Base line variation : 0 to 10V by helical potentiometer
d. Window width continously variable by helical potentiometer / Dial
Window : 0 -1V in WINDOW mode
ULD range : 0.10V in NORMAL mode
e. LLD, ULD & MODE switch, controls have been provided on front panel
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COUNTER TIMER PCB:
a. Display : 20x2 LCD Dotmatrix display has been provided to
indicate data counts & Elapsed time
b. Preset time : 0-9999 seconds
c. Command Buttons : START, STOP, PROG, STORE, INC & DEC
command buttons have been provided on the front panel key board
d. Modes of Data Acquistion:
(i) Counts for a preset time
(ii). CPS
(iii). CPM
e Preset Time Selection: Programmable through
switch control buttons
f. Data storage : Upto 1000 readings
g. Programmability : includes selection of preset time storing / recalling of
data, starting and stoping of
acquistion, lable assignment for data counts such as BG
(back ground), ST (standard)
and SP (samle).
h. Printing option : This module has built in
parallel port for Data Printing
i. Serial port : This module additionally has
built-in RS232C serial port
for down loading the data into PC.
EXPERIMENTS :
a. To findout the resolution of scintillation detector for Cs-137 & FWMF.
b. To findout best operating voltage of the detector.
c. To findout linearity of GRS with different Gamma Isotopes.
d. To findout the energies of an unknown Isotopes.
e. To plot Co-60 spectrum and findout the peaks interms of baseline channels and calculate per channel energy.
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APPLICATIONS :
The system finds wide range of applications in nuclear
research and academic fields which include analysis of
Gamma Radiations Identification of unknown isotopes
and their relative adundance
Measures the strength of Radioactivity of sample
Useful in radiotracer techniques
Can be used for protein bound iodine studies in medicine
using well type scintillation detector etc.
Swipe sample counting in Health Physics Labs.
SCINTILLATION DETECTOR :
Scintillation detector with flat type NaI crystal of 1"X1" or 1 ½" X 1 ½" or 2" X 2" or 3" X 3" flat or well type detector of 1 ½" X 1 ½" or 2" X 2" of NUCLEONIX make or its equivalent is compatible to GR611(I). The output of these units (taken from preamplifier) is POSITIVE for all Nucleonix make Scintillation detectors.
Hence the input polarity of the amplifier in GR611(I) is to
be selected for POSITIVE. Scintillation detector preamplifier required LV supply of -12V is drawn from the GRS(I) rear panel. So, also the HV bias supply for
the PMT of the detector assembly is also drawn from GRS(I) rear panel. Preamplifier of the scintillation detector is a charge integrating type of preamplifier.
TO PRINTER (Optional):
There is a centronics port built-in which facilitates data
printing on to a dot matrix printer.
Serial Port (RS232C) (Optional):
Built-in serial port facilitates stored data transfer under
PC programme control. This transferred data can be further processed if required by the user in PC.
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