Irradiators source storage

In static runs gas is supplied to the ion source only at a rate sufficient to compensate the outflow through the leak (0.5 cc./sec. for air, equal to conductance of leak). The gas mixtures were prepared in two 2-liter storage flasks of the gas handling system. Flow runs can be made by passing gas through the ion source. Different flow rates were obtained by interposing capillary tubes in series with the flow system. Flow rates with an average linear velocity of up to 10 meters sec.-1 could be obtained. Since the distance from the foil window to the leak is about 3 cm., the contact time for irradiation at this velocity is some 3 msec. 

Irradiate WT and CD 154 NIH3T3 using an appropriate source of y radiation and follow all the health and safety procedures of your institution. Lfsually a dose of 30 Gray is sufficient to block cell proliferation (see Note 6). Cells can be used immediately after irradiation or frozen in 90% heat/inactivated FBS supplemented with 10% DMSO and stored at -80°C or in liquid nitrogen for short- and long-term storage, respectively. 

Figure 2 compares the distribution of components in a nonirradiated isolate (0°C.) with an irradiated isolate. The solid curve resulted when the beef had been irradiated at the cobalt-60 source and then distilled. The dashed curve shows separation of concurrently processed isolates. Figure 3 illustrates the decrease in volatile constituents brought about by storage. 

The cobalt source is raised into the irradiation cell from the bottom of its storage pool for irradiation by the source elevator. The drive for the elevator is located in the modulator room. The motor for lifting the source is mounted on the main drive shaft by a torque-sensitive drive mechanism. This mechanism provides a safety feature by which, if the source jams, the elevator motor will hit limit switches and stop. 

Oleoresin and gingerol contents in y-irradiated dried ginger rhizomes were evaluated to determine the effect of radiation and storage on these constituents. Both whole and ground samples of dried rhizomes were irradiated (with 0, 5 or lOkGy doses ofy-rays from a 60 Co source) in sealed polyethylene... 

Radiation resistance decrease in mechanical strengtii at 10 Gy maximum absorbed radiation dose does not exceed 25% mechanical stiengtii under such impact is above the permissible stiengtii limit under squeezing 5.7 % Mechanical strength of irradiated samples was determined after 8-day hold-up in storage facility for spent sources. Absorbed dose = 1.2 10 Gy... 

In most Nordion irradiators the pencils of cobalt-60 are mounted vertically in a source rack. The configuration is formally described as laminar. The source rack is suspended from a hoist mechanism on the roof of the cell such that it is movable between two locations. One of these locations is in the center of the cell in a position where product can be moved around the source during its irradiation. The other location is below floor level. This is for safe storage of the source when product irradiation needs to be interrupted for loading or maintenance work within the cell. 

Batch irradiators are far rarer conveyors are of the closed loop type wholly contained within the celt. Loading is done by personnel who enter the cell with the source in its safe storage location. The source is then brought to its operational position in the center of the cell and the conveyor is set in motion, moving the product around the source. When sufficient time has elapsed to ensure that the product has absorbed its appropriate dose, the source rack is returned to Us safe location, and personnel enter the cell to unload and reload the conveyor. 

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