thinking of 1 to the neutrc Liquid scintillators, proportional counters, well as air? nuclear emulsions, etched track detectors, and anything to i thermoluminescent crystals have been used to meatrum--right d sure the enviromental neutron flux from thermal tions had bee to 10 MeV energies, below ground, at ground level, and Bethe in at an air-water interface, on a tower, and at an airborne altitude of 20,000 feet. Results are As a res compared with calculations based an a modified came involvec program for reactor computations.generaticn of this effect c

The restricted energy loss of electrons, positrons, protons, and pions passing through nuclear emulsions has been measured by observation of the variation in blob and grain density as a function of r = I/ (1 -p2)''3.All measurements were made in small areas (7 cm2) of two Ilford K-5 emulsion pellicles. A careful examination of the variation of blob density .with track depth was m ,~d e in both pellicles. The results of our measurements on the relativistic rise (5lOO) are in agreement with the predictions of the Sternheimer formula using a mean ionization potential I of 434 eV and a cutoff energy Wo of 6-10 keV. An upper limit of 1% is placed on radiative corrections of the type predicted by Tsytovitch. Correction for the finite number of developable grains traversed by the primary produced a best fit with Wo=6 keV, in excellent agreement with the maximum energy of a S ray that comes to rest within the working volume of blob counting.

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On 28 March 1979, a series of events occurred at Three Mile Island, Unit 2, which subsequently resulted in the release of noble gases into the atmosphere. The primary source of these gases was the Makeup and Purification System which carries primary system water into the auxiliary building. Degassing of this water, in concert with leakage out of the waste gas handling system, allowed radioactive gas to enter and pass through the building air filters to the atmosphere. The resulting offsite radiation levels at several locations were much greater than those due to routine operation.Doses received by the population were mainly due to '33Xe. The health and safety consequences of these releases were analyzed and found to be minimal in an Ad Hoc Interagency Report published by NRC, HEW and EPA in May 1979. In that report, the dose to the general population is estimated by two different methods, both of which rely on offsite TLD measurements. This article describes in detail one of the calculational methods that was used in the report. This method utilizes the topological time-averaged meteorological dispersion factors derived from meteorological data obtained during the accident as well as TLD data from the site environs.The dose to the population residing within 50 miles of the accident was estimated to be about 3400 person-rem by this method.