4” x 4” x 16” Scintillation Detector with Spectrosopic

Amplifier and Single Channel Analyzer (SCA)

Features :

· Built-in Ultra stable Cockroft Walton High Voltage Generator

· Built-in Preamplifier, spectroscopic amplifier and SCA

· Low power consumption (250 mW)

Description :

The detector contains a complete set of electronics. The detector has an internal High Voltage supply based on the Cockroft Walton principle.  This ensures stable gain also at high count rates and low power consumption.The signals from the photomultiplier tub are processed with a hybrid low power spectroscopic amplifier system; the output pulses can be directly fed into the MCA.The low power consumption makes the scintillation probe ideally suited for use with portable, battery operated multichannel analyzer systems. A built-in SCA with LLD and ULD adjustable provides TTL output pulses, 1.5 μs wide, 5V High.This TTL signal can be driven over 15 m cable length.High Voltage, upper and lower level discriminators can be set with 20-turns gain potentiometers with test points present at the back of the assembly whereas the test voltages equal the real analog voltages of the signal.

Specifications:

Photomultiplier: 3,5” diameter demountable PMT with solid μ-metal shield

High voltage generator: Cockroft WaltonType

High voltage polarity: Negative

High voltage regulation: 0 – 1500 V (20 turn screw potentiometer at back of assembly)

HV test point: 1V = 1 kV (red)

Required Power Supply:+5V or +12V (stabilized)

Test point: Present at back of assembly

(1 V = 1 kV)

LLD test = blue

ULD test = yellow

LLD/ULD adjust: Two 20-turns potentiometers (0-100%) with test points

Power requirements: 250 mW

Electrical connections:2-core shielded cable for power supply and signal (3m).Special connectors available on request.

Temperature range: -30˚ to +60 ˚ C

Housing: 1.0 mm aluminum or stainless steel

Spectroscopy amplifier

Output impedance: 50 Ω

Shaping time: 0.56 μs

Pulse shape: Bipolar ，1 μs rise time ，1 μs fall time

Maximum output: 8.5 V

Energy resolutions:< 8 % FWHM at 662 keV

HV generator noise: < 2 keV

5” x 3” x 16” scintillation detector for

low background applications

Features:

· 4 liter (14.4 kg) NaI(Tl) scintillation crystal

· Low radiological background due to stainless steel housing

· Low background, low noise PMT

· 4 pins connector for coupling to digital base

Description:

This large volume scintillation detector provides the optimum efficiency / energy resolution

ratio and is ideally suited for environmental monitoring. The housing is made of 0.8 mm

stainless steel.

Specificatons

Drawing : VS-066-10

Scintillation crystal : NaI(Tl) 76 x 127 x 406 mm

Photomultiplier tube : 76 mm diameter ETL 9305 or eq.

Maximum dimensions : 133 x 82 x 569 mm long (up to 14 pins connector)

Connectors : Standard 14 pins

Typical high voltage : +600 to + 900 V

High voltage polarity : Positive

Temperature range : -20 to +65 degrees C

Temperature gradient : Max 10 degrees per hour

Energy resolution : < 8.5% FWHM sideways

halfway at 30 cm off-axis