Accssories for Gamma ray spectorometer system -
Technical Data
(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 |
| Gain (Approx.) | 25 | 25 | 25 |
| 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 |
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.
