Accssories for Gamma ray spectorometer system -
(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 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 8.0 to 9.5% for Cs-137. Scintillation detectors of other sizes can be offered against user specific requirements also. For teaching labs we recommned 1″x1″ or 2″x2″ NaI detector with this integral model.
|Important Specifications||Detector Type|
|1. Flat/Well type NaI crystal||SD 151||SD 152/Sd 152 W|
|2. Crystal Sizes||1” x 1”||2” x 2”|
|3. Well Size (applicable for SD 152 W & Sd 153 W only)||–||0.656” dia x 1.546” deep|
|4. Photo multiplier||R6095 of Hamamatsu or its equivalent||EMI 9857 or 9266 or its equivalent|
|5. Resulation (Better than)||8.5 %||8.5 %|
|6. Pre-amplifier||Built – in||Built – in|
|7. Gain (Approx.)||25||25|
|8. Noise (RMS. referred to input)||Less than 50 µV||Less than 50 µV|
|9. Operating Voltage||600 to 900 V||700 to 900 V|
|10. Out put||Positive Tail Pulse||Positive Tail Pulse|
|11. Output impedance||90 Ohms||90 Ohms|
|12. Power Requirement (Typical)||-12V @ 12 mA||-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|
LEAD SHIELDING FOR SCINTILLATION DETECTOR [ Type : LS 250]
This consists of 40mm thick lead shielding cylindrical rings assembled according to the detector. There is a provision in the bottom ring through which system connections are given to the detector, which is placed inside the lead shield.