Technical Data

Multi-Channel Analyzer (MCA) is an important part of nuclear spectroscopy system. The major requirement of MCA is for nuclear Pulse Height Analysis(PHA) in energy spectroscopy. The USB-MCA presented here, incorporates state of art technologies like FPGA, USB bus interface and precision analog electronics to meet the stringent system requirements in nuclear pulse spectroscopy. The resolution supported by the USB-MCA ranges from 256 channels to 1K/8K channels selectable via software, making it suitable for all spectroscopy applications of low resolution (e.g. NaI-PMT).

The USB bus interface of the MCA provides an excellent connectivity with most of the new PCs and lap-top computers meeting minimum requirements of PC. The ANUSPECT application software provided with the USB-MCA, seamlessly integrates with the hardware, featuring a range of standard functions required for analysis and acquisition.

Note: 1K/8K MCA & Anuspect processing software are manufuctured & supplied by NUCLEONIX based on Baba Atomic Research Centre,Technology

Features

• Compact, 1K /8K MCA with USB interface.
• Built-in High voltage (0-1200V) @ 0.5 amps with adjustable bias voltage to detector.
• Built-in shaping amplifier with adjustable gain arrangement.
• Excellent MCA performance in terms of resolution, INL & DNL, etc.
• Universal connectivity to a wide range of PCs and notebook computers.
• Latest ANUSPECT Processing Software with the unit.
• Simple to install, operate and handle.
• Powered from 12V adaptor.
• Highly recommonded for university trading & research labs.

Specifications

Hardware features:

MCA resolution:	256, 512, 1K/8K.Spectrum memory: 128K bytes single port SRAM.
Max counts / channel:	31 bit (2 Giga counts).
Pulse processing time	7µsec including ADC conversion time of 5µsec.
Pile up rejection:	Active high TTL input from spectroscopy amplifier.
DNL: 1% INL :	0.05% F.S.
MCA Input:	Single channel, 0 to 10 volts. Built-in shaping amplifier with adj. gain features from rear panel. Built-in High Voltage module for detector bias (0-1200V @ 0.5A). Adjustability from rear panel trimpot
MCA module dimensions :	240mm Length x 95mm Width x 85mm Depth

Software features:

• Ideal software solutions for advanced gamma spectroscopy applications.
• User Interface panel for setting Hardware MCA parameters.
• Spectrum display (Standard / Zoomed, Linear / Log Scale).
• Optimized peak search algorithm.
• Non – Linear least square fit of peaks with exponential tailed model.
• Option for Automatic addition of peaks at channels with high residue after fit based on user criteria.
• Energy, peak shape and efficiency calibration.
• Nuclide identification and activity calculation.
• Comprehensive report generation for analysis results.
• Inbuilt Standard nuclide library.

Minimum Requirements for Installing Anuspect Software:

Operating system – Windows 7 or Higher Versions
CPU – Intel I3 or Above
RAM – Minimum 2 GB
Graphics Hardware – Direct X 9.Oc or Higher

Input Power:

(100-240V), A.C (47-63) Hz, A.C Power adaptor accepts above input & provides required 12V D.C @ 1A for the MCA module.

ACCESSORIES FOR INTEGRAL MCA MODULE MC 1000

(a) SCINTILLATION DETECTORS

Nucleonix Systems offers wide range of NaI Scintillation Detectors of different sizes both with flat & well type crystals, to meet the requirements of wide range of users for Gamma ray spectrometry measurements.

Scintillation detectors offered for teaching labs include 1″x1″ & 2″x2″ NaI integral assemblies with built-in pre-amplifiers. These detector assemblies give excellent stability, superior performance & good resolution in the range of 7.0 to 8.5% for Cs-137. Scintillation detectors of other sizes can be offered against user specific requirements also. For teaching labs we recommend 1″x1″ or 2″x2″ NaI detector with this integral model.

Important Specifications

Detector Type

1. Flat/Well type NaI crystal 2. Crystal Sizes 3. Well Size (applicable for SD 152 W & SD 153 W only) 4. Photo multiplier 5. Resolution (Better than) 6. Pre-amplifier 7. Gain (Approx.) 8. Noise (RMS. referred to input) 9. Operating Voltage 10. Out put 11. Output impedance 12. Power Requirement (Typical)

SD 151 1″ x 1″ — R6095 of Hamamatsu or its equivalent 8.5 % Built – in 25 Less than 50 µV 500 to 900 V Positive Tail Pulse 90 Ohms -12V @ 12 mA

SD 152/SD 152 W 2″ x 2″ “0.656” dia x “1.546” deep EMI 9857 or 9266 or its equivalent 8.5 % Built – in 25 Less than 50 µV 700 to 900 V Positive Tail Pulse 90 Ohms -12V @ 12 mA

(b) GAMMA REFERENCE STANDARD SET TYPE GS 290

Gamma Reference Standard Set Type: GS290 consists of a set of FIVE Gamma sources evaporated & sealed on 25mm dia x 5mm plastic disc covering SIX photopeak energies in the range of 3 to 5 micro curie. A reference chart for this is given below. The accuracy of these sources is in the range of +/-10%. All these dics sources are enclosed in a box made of acrylic sheet and supplied.

Gamma Isotope	Energy Mev	Nominal Activity	Half life
Co-57	0.123	2-5 µci	273 Days
Ba-133	0.36 (Main)	2-5 µci	7.5 years
Cs-137	0.662	2-5 µci	30 years
Co – 60	1.17; 1.33	2-5 µci	5.3 years
Na-22	0.511; 1.280	2-5 µci	2.6 years