The purpose of this memorandum is to describe the concepts for accomplishing localized tailoring of thermal neutron flux. The application of fuel displacement and enrichment techniques in lattice cells surrounding a test facility may accelerate sample irradiation rates by an order of magnitude or more above those in the normal reactor environment. Thus, test irradiation conditions may be established by such flux tailoring techniques which are not indicative of the specific flux and power conditions characteristic of the reactor loading as a whole.

Neutron yields for alpha particle reactions with beryllium, boron, carbon, magnesium, and oxygen are calculated. The dependence on energy of the incoming alpha particles is analyzed for yield. Calculations are varied for different sets of cross section data.

The diffusivities presented in the present paper are determined using the same technique and the calculated diffusivities for both TaC and Ta2C are found to be in good agreement with Resnick et. al.

For zero net wind transport conditions the doses obtained with th AI particle size distributions are not significantly different from those obtained with the BMI distribution. Small (< 20 micron) particle data are needed.

This report presents the details of the activities of Douglas United Nuclear at the Hanford site during the month of February 1967.

The objectives of the NES Duct Coolant System Water Flow Tests was to check out the Duct Coolant System under dynamic flow condition, to determine adjustments needed to achieve the prescribed flow rates in the various flow paths, and to determine its operational characteristics.

We have attempted to determine the relative biological effectiveness (RBE) of negative pions in the Bragg-peak region as compared to the plateau region and to gamma rays. We irradiated LAF{sub 1} mice, bearing 5-day-old lymphoma ascites tumors, in the peak and plateau regions of a 90-MeV pion beam for 40 hours in temperature-controlled holders. The animals were then sacrificed; lymphoma cells were withdrawn and titrated into adult female LAF{sub 1} mice. The proliferative capacity of the irradiated tumor cells was evaluated after 8 weeks by observing the percentage of animals developing ascites tumors. Surviving fractions were then calculated from LD{sub 50}`s of control and irradiated animals. Radiation doses in the 50 plateau region were measured with LiF dosimeters calibrated against cobalt-60 gamma rays. We calculated peak doses from those at the plateau, using a measured average peak-to-plateau ionization ratio of 1.5. Doses in the plateau region ranged from 145 to 250 rads; doses in the peak region ranged from 220 to 380 rads. The survival curve for cells irradiated in the peak region gave a D{sub 0} of 65 {plus_minus} 15 rads. The plateau points were not reliable. A replicate experiment was performed using Co{sup 60} {gamma}-rays, yielding a survival-curve …

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Data are summarized on levels of radioactivity in environmental samples collected at Hanford during 1966, including detailed data on samples collected during December. Data are included on the radioactivity in fallout from Chinese and Russian nuclear weapons test, samples of drinking water and Columbia River water, the /sup 56/Mn content of Columbia River water sampled at various locations, the /sup 131/I content of gaseous wastes and surface waters, and the radioactivity of soil samples from the chemical separations liquid waste treatment and disposal area. The radiation dose to personnel during the year from all enviromnentl sources was estimated to be less than 0.3 percent of the applicable limits. (CH)

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We investigated electron and gamma spectra of mixtures of isotopes of curium. This was done on a beta spectrometer with double focusing at an angle of {pi}{radical}2 and on a scintillation gamma spectrometer with a 40 {times} 40 mm NAI(Tl) single crystal detector. The observed electron spectrum are interpolated and presented. Also, experimental results of the ratio of conversion at L and M subshells are presented and compared to theoretical values.

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Areas of work reported include: general radiation effects; toxicity of radioelements; combating detrimental effects of radiation; studies at the molecular and cellular level; environmental radiation studies; atmospheric radioactivity and fallout; marine sciences; radiological and health physics; and radiation instruments.

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This memorandum describes the goals for the fourth quarter of fiscal year 1967, for the Plowshare Program. The goals are set out as minimum goals to be achieved by different divisions in the laboratory which are involved in this program. Some of the direction depends upon whether a preliminary test explosion is fired.

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The objective of the meeting was to provide a companion meeting to the ''First Symposium on Accelerator Radiation Dosimetry and Experience'' which was held November 3-5, 1965, at the Brookhaven National Laboratory. This first symposium was limited in scope to an intensified discussion of dosimetry techniques. The biology which is associated with high energy radiation was specifically excluded, since it was the original plan to hold a second symposium devoted entirely to biology. Thus the present Symposium was a sequel to the first and they were inseparable in their objectives. Since those attending the BNL Symposium were almost entirely health physicists with a background in physical science and actively engaged in the solution of radiation protection problems at high energy accelerators, it was felt that it would be necessary to begin the BID Symposium with a general review session on radiation biology, in order to provide a biological background for the proper understanding of the later sessions. This first session was arranged to give the health physicist a meaningful transition from fundamental radiobiological considerations to current new research activities in high energy biology. In our opinion, and also based on the comments of several of those attending these objectives were …

The objectives of this test are to determine if autoclave film has an important role in the groove and ledge corrosion mechanism, to evaluate the performance of unautoclaved fuel in corrosion environments of different severities, and to verify the importance of process water pH in regulating the frequency and severity of groove and ledge corrosion.

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