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″ & 3″x3″ 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.
|Important Specifications||Detector Type|
|1. Flat/Well type NaI crystal||SD 151||SD152F||SD152W||SD153F||SD153W|
|Crystal Sizes||1” x 1”||2” x 2”||2” x 2”||3” x 3”||3” x 3”|
|a. Flat crystal||Flat||Flat||Well||Flat||Well|
|b. Well Size (applicable for well type detectors only)||Not applicable||Not applicable||0.75” dia X 1.43” deep||Not applicable||0.656” dia X 2.063” deep|
|Resulation (Better than)||8.5 %||8.5 %||9 %||8.5 %||9 %|
|Photo multiplier||R6095 of Hamamatsu or its equivalent||EMI 9857 or 9266 or its equivalent||EMI 9305 or its equivalent|
|Pre-amplifier||Built – in||Built – in||Built – in|
|Noise (RMS. referred to input)||Less than 50 µV||Less than 50 µV||Less than 50 µV|
|Operating Voltage||600 to 900 V||700 to 900V||750 to 900V|
|Out put||Positive Tail Pulse||Positive Tail Pulse||Positive Tail Pulse|
|Output impedance||90 Ohms||90 Ohms||90 Ohms|
|Power Requirement (Typical)||-12V @ 12 mA||-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.
Note : BRIT is not able to supply this Mn-54 at present. In view of this we are able to give only 5 sources in the Gamma Reference set.
|Gamma Isotope||Energy MeV||Nominal Activity||Half life|
|Co-57||0.123||2-5 µCi||273 Days|
|Ba-13||0.36 (Main)||2-5 µCi||7.5 years|
|Na-22||0.511; 1.280||2-5 µCi||2.6 Years|
|Cs-137||0.662||2-5 µCi||30 Years|
|Co-60||1.17; 1.33||2-5 µCi||5.3 Years|
|Mn-54||0.835||2-5 µCi||312 days|
LEAD SHIELDING FOR SCINTILLATION DETECTOR [ T ype : 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.