Recoil chemistry of carbon-11 in liquid hydrocarbons

Recoil chemistry of carbon-11 in C5 hydrocarbons, fragmentation and stabilization

“…The use of this and the previous ratio then give the ratio of the acetylene activ ity as seen by the flow system to the total activity as seen by the flow system, which is the absolute yield.Three determinations of the absolute yield of acetylene from isopentane give values of 21.64, 21.81, and 21.56% with an average value of 21.67%. This value was used throughout this study to calibrate the flow system.A comparison was made between this work and that ofClark(57). Two determinations of the acetylene yield in methylcyclopentane were made using the yield of acetylene in isopentane as a calibration.…”

Deactivation of reaction complexes in the recoil chemistry of 11-C

“…Dose studies made on the gaseous products from similar hydrocarbons have demonstrated that the product with the highest dose dependence is methane, showing a substantial increase in yield with increasing dose. Ethane and ethylene show slight increases with dose while acetylene is essentially unaffected (47)(48)(49)(50)(51).…”

“…Up to this time, most of the data on the gaseous prod ucts from 5-and 6-carbon liquid hydrocarbons was reported as ratios of the yield of a given product to the yield of acety lene. Recently, the percentage yields of the various gaseous products have been reported for a number of hydrocarbons (50,51). In each case acetylene was the major gaseous product.…”

“…The effects of radiation dose on the yields of products formed from the reactions of carbon-11 in hydrocarbons have been studied by several authors (47)(48)(49)(50)(51). These studies were concerned only with the gaseous products, methane, ethane, ethylene and acetylene.…”

“…The methylcyclopentane system was used as a standard for calibra tion. The percentage of acetylene in this compound has been well established as 17.8(51). The procedure involved the irradiation of methylcyclopentane samples, counting them on the auxiliary counter and the analysis of the gaseous products.…”