The Gamma Ray Spectrometer (Microcontroller based) Type GR 611M consists of a MINIM based modular counting unit and a Scintillation Detector Type SD 150/151/160W. The Spectrometer can also be used for Gamma Counting applications. This MINIM based system has added advantage of savings in cost and also conserves bench space because of its optimal design.
This system is configured around MINI BIN and Power Sup ply Type: MB 403 with the following Modules:
High Voltage Unit Type: HV 502
Linear Amplifier Type: LA 520
Single Channel Analyser Type: SC 530
& Counter Timer Type: CT 541A
(Microcontroller based), having unique built-in user programmable features for data acquisition & data outputting. |
Features
- Microcontroller based, compact, rugged, light weight, portable and modular in construction.
- MINIM systems conserve bench space and significant savings in cost is achieved because of optimal design.
- Uses Microcontroller based Counter/Timer with advanced features for data acquisition & data outputting.
- Along with Scintillation Detector one can use it as a Gamma ray spectrometer or as a gamma counting system.
- Highly regulated variable EHT from 0 to 2000V.
- Linear amplifier with adj gain and choice of shaping time constants.
- Single channel analyser facilitates both integral, differential or window counting.
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| Specifications |
| MINIBIN AND POWER SUPPLY MB 403 |
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Mini bin |
Accommodates SIX / EIGHT single bit modules or combination of multiple widths with Amphenol connectors. Minibin is primarily designed with the objective of conserving bench space and to achieve significant saving in cost of the Minibin based systems. Bussed wiring is provided to the power connectors to distribute +/- 12V and +/- 24V. A control panel with ON/OFF switch, low voltage test sockets is provided on the right extreme side of the bin. |
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Minibin Dimensions |
11.75" width X 11.00 depth (upto connectors) X 8.75" height. |
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Power supply |
This is either two and half bit module or a compact box type enclosure fitted at the back of this bin, which generates highly regulated D.C voltages. |
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Input |
(230V + 10%) A.C, 50Hz. |
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D.C Output |
+12V @ 1A, -12V @ 1A, +24V @ 0.5A, -24V @ 0.5A 48 watts maximum.
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Regulation |
Better than +/- 0.1% |
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Noise & Ripple |
Less than 3 mV |
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Stability |
+/- 0.5% after a 24 hr warmup at constant line, load & ambient temp. |
| II. HIGH VOLTAGE UNIT (HV 502) |
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a. Output voltage variable continuously from 0V to 2000 volts
b. Output current (max) 1mA
c. Load & Line regulations : Better than 0.005% of full scale
d. Indefinite over load & short circuit protections and self recovery
e. Output ripple less than 20mV.
f. Dimensions : Single / Two bit module |
| III. LINEAR AMPLIFIER (LA 520) |
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a. Input Polarity : Positive or Negative
b. Total gain (Typical) : 800 (approx)
c. Output (Unipolar) : 0 to 8V
d. Max. output (Unipolar) : 12V
e. Dimensions : Two bit module |
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| IV. SINGLE CHANNEL ANALYSER (SC 530) |
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a. Input :
Unipolar or bipolar with a +ve leading edge 0 to 10V
b. Pulse Pair resolution(approx) : 0.6 micro sec.
c. Output pulse polarity : +Ve
Pulse amplitude : +5V
Pulse width : 0.5 micro sec
d. LLD output pulse amplitude : +5V
Output pulse width : 0.5 micro sec
Base line variable by : 10 turn
Base line variation : 0 to 10V by helical potentiometer
e. Window width continuously :
Variable by helical potentiometer
(0 - 1) V in window mode
(0 - 10) V in normal mode
f. Dimensions : Single bit module |
| V. COUNTER TIMER (CT 541A) :
COUNTER / RATEMETER |
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This is a microcontroller based state-of-art Counter/
Timer unit having lot of advanced features.
a. Input : 100mV to 10V, unipolar or positive bipolar semiguassion pulse
b. Pulse width : 0.5 micro sec (min)
c. Polarity : Positive or Negative
d. Input impedance : 1K (approx)
e. Input Counts Capacity : 999999 counts
f. Pulse Height Discrimination : 100mV - 10V by a preset provided on front panel
g. Counts Indication :16x2 dotmatrix LCD display
h. Modes of Data Acquisition : (i). Counts for a preset time (ii). CPS (iii). CPM
i. Storage facility : upto 1000 readings
j. TIMER
Preset Time Setting : Programmable through tuctile switch control buttons
k. Preset Time / Elapsed Time : on 16x2 dotmatrix LCD display
l. Preset Time Range : 1 to 9999
m. Built-in printer port facilitating direct data printing
n. Additional Options :
i. Data communication software for down loading of
data can be given at extra cost .
ii. External hand held keypad with cable. |
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| VI. EXPERIMENTS |
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Ø Calibration and determination of the resolution of the spectrometer.
Ø Study of complete spectra of sources such as CS-137, Co-57, Co-60, Zn-65, Na-22 and to locate the photo peak, X-ray. peak, compton Escape peak etc.
Ø To find the photo peak efficiency of a NaI(TI) Crystal of given dimensions for a different energy gamma rays.
Ø To determine the strength of a given source.
Ø To find the energy and relative intensity of gamma rays in an isotope emitting more than one gamma ray. |
| VIII. APPLICATIONS |
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The system finds wide range of applications in nuclear research and academic fields which include:
Analysis of gamma radiation Identification of unknown isotopes and their relative abundance.
Measures the strenth of radio activity of sample.
Useful in radiotracer techniques.
Can be use for protein bound iodine studies in medicine using well type scintillation head etc.
Swipe sample counting in Health Physics Labs. |
