A group of patients with chronic gastric ulcers received a course of laser treatment with the use of laser on copper vapours. Gastric ulcer was exposed to radiation once in the course of 5 days, the single dose being equal to 10-15 J. Complete healing of the ulcerous defect was attained in 100 out of 110 patients examined. The results of laser therapy were found to be influenced by certain clinical characteristics, namely by age, ulcer size, duration of the last disease exacerbation, and acid-secreting function of the stomach.
Laser Therapy , Stomach Ulcer/radiotherapy , Wound Healing/radiation effects , Adolescent , Adult , Age Factors , Aged , Chronic Disease , Copper , Female , Humans , Male , Middle Aged , Radiotherapy Dosage , Time Factors , Volatilization
The spectra of stimulated emission, observed in the process of the H(2) + F(2) ? HF and D(2) + F(2) F(2)? DF reactions, were investigated and compared. The stimulated emission in the vibrational transitions up to 6-5 for the HF molecule and up to 9-8 for the DF molecule was discovered. It was found that the emission energy in the transitions of 2-1 and 5-4 bands in the H(2) + F(2) mixture was the highest possible. In the D(2) + F(2) mixture the emission energy maxima correspond to the 3-2 and 8-7 bands. The presence of the two maxima reflects the fact that the two types of chemical reactions contribute to the population inversion creation. One is a F + H(2)(D(2)) reaction, the other is a H(D) + F(2) reaction. By analyzing the characteristics of the chemical laser in which the energy exchange between the DF and CO(2) molecules takes place, the energy-transfer rate constant was estimated with the value being equal to (1.5 +/- 0.5) x 10(-12) cm(3) sec(-1).
A high speed photography arrangement with a resolution power of 3 nsec is described which permits obtaining shadow and schlieren photography and also interferometry. Such an arrangement was applied to the investigation of microplasma production by laser beam on the surface of a solid target. Shock wave velocities as high as 200 km/sec were registered and the electron density distribution in a plasma was defined.
