Local blood flow into tumors during artificial hyperglycemia

The blood flow in the rat Guerin carcinoma was measured by the hydrogen clearance method. It was shown that the blood flow in the tumour tissue decreased almost 3.5 times to the 3 hours of the intravenous glucose infusion at a dose of 80 mg X kg-1 X min-1. In some tumours the microcirculation ceased completely. The results obtained help developing the new schemes of local hyperthermia and induced hyperglycemia in the complex antitumour therapy.     

Transistor frequency meter for measuring the thickness and growth rate of films

Conclusions Investigations carried out have shown the feasibility of constructing transistorized frequency-voltage converters with a high output voltage and a high linearity. The use of a similar circuit in the KIT-1 and KIT-2 instruments permit not only the thickness to be measured but also the rate of growth of a film in the case of deposition rates from O.1Å/sec and higher.Translated from Izmeritel'naya Tekhnika, No. 5, pp. 63–64, May, 1973.     

A fast-neutron pulse reactor

In June, 1960, criticality was reached on the fast-neutron pulse reactor constructed at the United Institute of Nuclear Studies. The fast-neutron pulse reactor is designed to work under periodic pulse conditions at a mean power output of about 1 kw. The power pulses are developed from the multiplication of prompt neutrons during an interval in which the reactor is in a supercritical state. The half-width of the power pulses is 36 microseconds, and the pulse repetition frequency may be varied between the limits 8–80 pulses/sec.     

Spatial distribution of γ-rays and moderated neutrons in the graphite column of the RFT reactor

Measurements have been made of the spatial distributions of neutrons of various energies and the -rays in the graphite thermal column of the RFT reactor. The fluxes of thermal, resonance, and fast neutrons were measured using the activity induced in various indicators. The decay in the intensity of the /gg-radiation was determined by small condenser type ionization chambers. At distances from 80 to 160 cm the fluxes of resonance and fast neutrons fall off approximately exponentially with a decay length of /R~ 13 cm and 15.7 cm, respectively. At large distances the fluxes of fast and resonance neutrons are in equilibrium. The flux of slowed-down neutrons in this region falls off exponentially with a decay length of 18.2 cm as determined by the penetrating fast-neutron component with an energy of approximately 6.6 Mev. The intensity of the -radiation in the graphite column falls off in an almost exponential manner with an attenuation coefficient = 3.78 · 10^–2 cm^–1. The theoretical predictions are found to be in satisfactory agreement with the experimental data.