[en] The radiation response of C₃H 10T1/2 mouse embryo fibroblast cells, assayed in vitro for loss of reproductive integrity and transformation frequency, has been studied for various radiation qualities for a range of dose-rates. Experiments were carried out using two sources of neutrons, one at 24 keV (in the intermediate energy region) and the other at 2.5 MeV. The rbe for 24 keV neutrons was found to be about 12 at a transformation frequency equivalent to that produced by 2 Gy of X-rays. For doses above 0.5 Gy of neutrons the transformation frequency is higher than any level observed with X-rays. This response is in broad agreement with the currently used values of 10 for the quality factor for intermediate-energy neutrons. The 2.5 MeV neutrons were used to make an intensive series of measurements relevant to the so called inverse dose-rate effect. (author)

[en] A number of properties in the Albany/Colonie area have been identified as being potentially contaminated with uranium originating from the former National Lead Company's uranium forming plant in Colonie, New York. The property at 1047 Central Avenue in Albany, New York was the subject of a radiological investigation initiated August 26, 1986. The commercial property consists of a two-story frame building located on an irregular lot. An asphalt drive connects the property to the street. A diagram of the property showing the approximate boundaries and the 6-m grid network established for measurements outside the building is shown. The lot included in the radiological survey was /approximately/18 m wide by 60 m deep. Front and rear views of the property are shown. 13 refs., 5 figs., 5 tabs

[en] A number of properties in the Albany/Colonie area have been identified as being potentially contaminated with uranium originating from the former National Lead Company's uranium forming plant in Colonie, New York. The property between 80--110 Yardboro Avenue, Albany, New York, was the subject of a radiological investigation initiated June 8, 1986. The property consists of a vacant parcel with not structures on a rectangular lot. A concrete slab extends onto the lot from the property to the east. A diagram of the property showing the approximate boundaries and the 20-m grid network established for measurements are shown. The rectangular area included in the radiological survey was /approximately/120 m wide by 34 m deep. Two views of the property are shown. The red brick building partially showing in the background is the former NL Industries Plant. 13 refs., 6 figs., 4 tabs

[en] A number of properties in the Albany/Colonie area have been identified as being potentially contaminated with uranium originating from the former National Lead Company's uranium forming plant in Colonie, New York. The property at 1054 Central Avenue in Albany, New York was the subject of a radiological investigation initiated August 27, 1986. The commercial property consists of a two-story frame and block building located on a rectangular lot. An asphalt drive connects the working areas to the street. A diagram of the property showing the approximate boundaries and the 5-m grid network established for measurements outside the building is shown. The lot included in the radiological survey was /approximately/13 m wide by 43 m deep. Front and side views of the property are shown. 13 refs., 5 figs., 5 tabs

[en] The authors report on a theoretical investigation of liquid helium-4 at negative pressures. For normal liquid helium they estimate the thermodynamic functions for negative pressure via extrapolation of measurements made for positive pressures. They determine the free energy as a function of density and temperature and find the location of the liquid-vapor spinodal. The results of these calculations are used to construct a temperature-dependent density-functional scheme to describe the inhomogeneous liquid. This density functional is then applied to calculate the rate at which bubbles nucleate in the liquid at negative pressures. The authors include a discussion of the properties of the superfluid phase based on the use of Landau's quasi-particle model

[en] The cytokinesis-blocked micronucleus technique has the potential of being a simple method of biological dosimetry for the rapid screening of individuals following large scale radiation accidents and for the assessment of suspected radiation over exposures. This technique was used to study the induction of micronuclei in human lymphocytes following irradiation in vitro by strontium/yttrium-90 beta rays. The lymphocytes were obtained from eight individuals aged between 23 and 57 years. The wide variation in dose-response for this limited sample, suggests that this technique requires prior routine measurements on unirradiated personnel if the sensitivity of the technique is to be maximised. Beta irradiation in vitro appears to be less effective at inducing micronuclei than x-rays. (author)

[en] We report preliminary results on cavitation experiments in ⁴He in the presence of a small number of free electrons in the liquid. At negative pressures insufficient to produce homogeneous nucleation we observed cavitation events which we ascribe to nucleation at electron bubbles. We present measurements of the threshold for cavitation at electrons over the temperature range 1.8-3.2 K

[en] Published in summary form only

[en] In accident situations, it is a requirement that dose distribution throughout the body is assessed. For poorly penetrating radiation, the variation in dose with area and depth in skin needs to be determined also. Individual personal dosemeters alone cannot be relied upon for providing this information. Biological techniques which can estimate the whole-body, localised and superficial doses would be particularly useful, especially for determining the prognosis and appropriate medical treatment following radiation doses which can produce gross tissue damage. (author)

[en] Since free electrons form small voids in liquid helium they are expected to be preferred sites for nucleating macroscopic bubbles when the liquid is exposed to sufficiently large negative pressures. We have performed a series of cavitation experiments using focussed ultrasound where free electrons were introduced into the liquid by a radioactive source. The electron bubbles are found to explode at negative pressures significantly lower than those required for homogeneous nucleation. We present measurements of the thresholds for cavitation at electrons in the temperature range 1 - 4.5 K. Reasonable agreement with a simple model for the stability limit of the electron bubble is obtained. (author)