Document RjgZpOOyaN76yzxwv6eLmqv1a

590 Accidental Acuf Radiation Injury. The Need for Recognition. G. A. Andrews and R. j. Cloutier Arch. Environmental Health 10, 498-507 (March, 1965). The probability of eerioue expoeure to radiation that will produce acute symptom! is exceedingly small as shown by past history. However, the increased use of radiation makes it desirable that physicians be acquainted with the symptom* and management of acute radiation exposure. Usually whether a radiation exposure has been or could have been received will be known. The possibility that an unknown exposure to radiation may occur is real, and in this situation skill and awareness are needed for a correct diagnosis. Early diagnosis will provide a basis for treatment and will permit the discovery of other persons who may also have been exposed: most important, it will permit the elimination of the source of exposure. Authors' summary ENVIRONMENTAL MEASUREMENTS 591 Photodynamic Bioassay of Polycyclic Atmospheric Pollutants. S.S. Epstein, etal. ,, J. Air F*oU. dontrol Alien. 15. 174-1-76 (April. 1965). The mortality from lung cancer in many parts of the world has reached alarming pro. portions. The existence of close associations between lung cancer, urbanisation, and atmosphene pollution is now generally accepted. Although the mode of interaction of the latter factors and smoking is debated, the importance of multiple etiologic factors has become apparent. These considerations emphasise the paramount need for methods which will yield simple and rapid estimates of the potential carcinogenic hasard of polluted atmospheres. Such information could possibly then serve as a basis for action designed to reverse lung cancer mortality trends. The authors describe a photodynamic bioassay which can be conducted on one milligram amounts of organic atmospheric particulates. The results of a pilot study on pollutants from several American cities indicate that the assay may provide a rapid, simple and economical biological index of potential carcinogenic hasard attributable to polycyclic compounds. The utility of the assay for this purpose is under further evaluation 592 The Detection and Estimation of Part Per Biliion Concentrations of Hydrocarbons. M. Feld stein and S. Balestrieri. J. Air Po.. Control Assn. 15, 177.178 (April, 1965) The addition of a freeze.out step in ,:ou.c nitrogen prior to analysis by gas chromato graphy with flame ionisation detection permits in* accurate determination of Cj and higher hydrocarbons in the part per billion (ppbi range Concentrations of C2 and higher hydrocarbons have been measured in commcrical cvlinoert a: nitrogen, helium and hydrogen. Using a 150 ml. sample of gas, recovery oi ppb concent rations is 95 to 100%. . Authors' abs: 593 Further Evaluation of Glass Tiber Filters :ar urr.>..ng Hydrogen Fluoride. M.R. Pack ane A.C. Hill. J. Air Poll. Control Assn. .3, . co .. o' .April. 1965). Air sampling studies were conducted :j e.a.aate the effectiveness of glass fiber filters for collecting hydrogen fluoride. Air contain.ng -..orogen fluoride was drawn through glass fiber filters and the amount collected determined ' A tingle filter collected up to 75 micragrams F/sq. in. and 2 filters, one behind the other. ca..ected up to 250 micrograms F/sq. in a: ::.:er area before loss through them reacned 5 r> F..ters *itn a latex binder were less efficient .collecting hydrogen fluoride than those wur.a.t :.*.e binder. Once adsorbed, little hvorage' fluoride was lost bv drawing additional low :..ar.ae air through the filter. Glass fiber filtert'can be used for sampling hydrogen .ar.se aver a wide range of concentrations at :ar.g as the sampling rate and time are controi.ee :a >a.d exceeding the saturation limit o: t.-.e f..:er Authors summer-. 01 132 2876