(b) END WINDOW G.M. DETECTOR TYPE GM 125

GM 125 is a Halogen Quenched, wide End Window GM Detector, supplied by NUCLEONIX. It is highly recommended for swipe sample counting of Beta samples by health Physics labs. Its operating voltage is approximately 500V. It has good plateau length and plateau slope. Its operating voltage is approximately 500V

It is enclosed in a PVC cylindrical enclosure for protection & supplied. An MHV socket provided on one side of the PVC enclosure facilitates one to connect to detector socket on rear panel of the counting system.

Specifications

(c) Stand for G.M. Detector [Type: SG200]

Stand for G.M. tube type SG 200 has been designed to hold end window G.M. tubes. This stand can be housed inside the lead shielding if required. It has both sample and absorber trays. The position of these trays can be adjusted from the end window of the detector. The stand made up of acrylic sheet is precisely milled for sliding-in of sample and absorber trays.

Sample tray is designed to hold planchets or disc type radioactive standard source ( Beta or Gamma). Aluminimum absorber discs can be interposed between the source and the detector for attenuating the radiation as seen by the detector.

This stand is an essential accessory for connecting end window G.M. tube to any of the G.M. counting systems manufactured by NUCLEONIX. For universities and colleges sliding bench type SB205 is recommended.

(d) SOURCE KIT – 1 TYPE SK 210

Source Kit-1 type SK 210 offered by NUCLEONIX contains one each of Beta and Gamma sources. These are low active disc sources of the order of 2 to 10 micro curie for Gamma & Beta. Gamma source disc is evaporated and sealed on 25mm dia X 5mm thick plastic disc. Whereas Beta source disc is evaporated & sealed on 25mm X 10mm thick plastic disc and covered with 10mg/ sq.cm aluminised mylar film. This source kit is an ideal choice along with G.M. counting system for educational institutions & Research labs. Source kit containing the disc sources is offered in an acrylic box of dimensions 86mm X 46mm X 25mm (approx).

(e) ALUMINIMUM ABSORBER SET TYPE AA 270

Aluminimum Absorber Set Type : AA 270 offered by NUCLEONIX consists of absorber discs in different thicknesses ranging from 20 to 300 mg/cm.sq. Each of these absorbers is mounted in an individual plastic frame, which exactly fits into the absorber tray of the G.M. stand.

The diameter of each disc is approximately 50 mm including the frame. There is identification number for each disc printed on it. A chart showing the identification number and thicknesses of the disc in grms per unit area is given in the absorber box which is made up of acrylic sheet. All these discs are housed in this acrylic box. This absorber set will be useful in studying the Beta absorption coefficient using G.M. Counting systems.

(f) Lead castle with door for G.M detector TYPE LS- 240

This consists of 40mm lead shielding cylindrical rings assembly with required number of middle rings of assembly parts. There is a hinged door in the bottom ring through which sample can be loaded in to the G.M stand sample tray.

A 1mm aluminum lining is provided on the inside surface of the lead shielding. When it is dispatched from here usually it is packed in wooden boxes. So, on unpacking there parts could be assembled as shown in the enclosed drawing.

Dimensions :

a. External : 200mm dia x 340mm height (approx)

b. Internal : 120mm dia x 280mm height

c. Weight : Approx. 88 Kgs.

(g) Absorber/Scatterer Set [TYPE: AS 272] (For Back Scattering of Beta Particles Experiment).

The absorber / scatterer set consists of 15 Aluminum foils, the thickness of each foil being 0.05 mm. For increasing the thickness of the scatterer, the required number of aluminum foils is to be stacked together and put in the frame provided.

(h) Absorber Set [Type: AS 273](For Production and Attenuation of Bremsstrahlung Experiment).

The absorber set consists of the following combination of materials:

1. Aluminium (0.7 mm thickness) & Perspex (1.8 mm thickness) .

2. Perspex (1.8 mm thickness) & Copper (0.3 mm thickness).

3. Aluminium (0.7 mm thickness) & Copper (0.3 mm thickness).

(i) Sliding Bench [Type: SB201/SB205]

SB201 is meant for use with GM120 Detector. SB207 is meant for use with GM125 Detector. Sliding bench SB207 is designed specially for the purpose of mounting bench the G.M counter accessories for doing the experiments in a most convenient fashion. This essentially consists of a bench with sliding groves with a graduated S.S scale fixed on one side of it. Scale has graduations both in cm & inches upto 50cm/20 inches. There are three vertical sliding mounts, one for mounting of End Window G.M detector, Second is ‘Absorber Holder’ & Third is ‘Source Holder’ & source mounts. Each of these mounts can be positioned along the slide scale to have required distance between the end window to the source with absorber mount interposed in between. End window detector is housed in PVC enclosure with MHV socket fixed on to it.