Effect Of Beta Radiation Research Articles

Effect of Beta Irradiation on Growth and Yield of a Field Pea Crop

A field study was carried out in which a beta-emitting fallout simulant was applied to a 35-day-old pea crop. Upon deposition of the simulant, almost all of the material came to rest on the soil surface and not on the plant. A dosimetry system was developed for measurement of the beta dose received by the plants. The fallout simulant consisted of yttrium-90 fused on very fine sand. An application of $55 {\rm mCi}/{\rm m}^{2}$ resulted in a surface dose of 1,690 rads to plant tissue in the region of the shoot meristems. This level of radiation reduced yield of peas to 39% of the control. Higher radiation levels reduced pea yield to zero, but 38,500 rads were required to materially reduce vegetative growth. Thus it was observed that reproductive tissue was much more sensitive to beta-radiation damage than was vegetative tissue. On the basis of theoretical calculations, it is suggested that the beta-radiation component in fallout may be more significant than the gamma component in adver...

The Effect of Beta Radiation on Mesenteric Pacinian Corpuscle Response

Responses of 26 cat mesenteric Pacinian corpuscles, recorded in situ, were used to characterize the effect of low dose beta radiation on these visceral receptors. Control experiments were performed on 14 of these receptors while the remaining 12 receptors were exposed to a Sr-Y-90 beta source for varying lengths of time. Experimental conditions were such that the Pacinian corpuscles responded repetitively to 2-msecond mechanical pulses and produced trains of spikes during sustained deformation of the tightly stretched mesenteric sheet. The receptors were not active in the absence of an imposed stimulus and, in agreement with other reports, none of the irradiated receptors showed any activity attributable to the presence of radiation alone. For irradiated corpuscles the variation in spacing between adjacent clusters on poststimulus time histograms, derived from a repeated series of mechanical pulses, appeared to reflect a specific alteration of the normally stationary distribution of evoked responses. The ...

Effect of Beta Irradiation on Oxygen Consumption in the Frog Sciatic Nerve

Frog sciatic nerves show an increase in oxygen consumption due to beta irradiation. There are two peaks in this increase. The first peak seems to correspond to the beginning of enhancement of the relative amplitude of the action potential where this enhancement occurs. The second peak corresponds to the drastic change occurring in the negative afterpotential which precedes the end of the nerve's ability to generate an action potential. There seems to be a definite relation between radiation damage on the one hand, and potassium efflux, the negative afterpotential, and oxygen consumption.

Effect of beta irradiation on ganglionic bioelectric activity

ARTICLESEffect of beta irradiation on ganglionic bioelectric activityB KaackB KaackPublished Online:01 Dec 1967https://doi.org/10.1152/ajplegacy.1967.213.6.1451MoreSectionsPDF (1 MB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformation Cited ByBehavioral Effects of Ionizing Radiations More from this issue > Volume 213Issue 6December 1967Pages 1451-1458 Copyright & PermissionsCopyright © 1967 by American Physiological Societyhttps://doi.org/10.1152/ajplegacy.1967.213.6.1451PubMed4294712History Published online 1 December 1967 Published in print 1 December 1967 Metrics

The action of beta-rays on DNA synthesis and mitotic activity in the rat cornea epithelium. Radioautographic studies with H3-thymidine

The effect of beta irradiation on the corneal epithelium of the rat is investigated at intervals of 24 hours, 7 and 28 days after application of 600 rep, 2400 rep and 6000 rep using a 90-Sr-applicator (contact treatment). Changes of cell proliferation resulting from irradiation treatment are studied by autoradiographic determination of the labelling index using 3-H-thymidine and by determination of the mitotic index.

Thermal Decomposition along Dislocations

The effects of relatively low temperature and prolonged irradiation or cold-working on the kinetics of thermal decomposition along dislocations were investigated. Data are presented on the effects of BETA irradiation and temperature on the decomposition of polycrystalline NaBrO/sub 3/ and colloidal alpha -PbN/sub 6/, and the effect of prolonged neutron irradiation and temperature on the decomposition of dehydrated nickel oxalate. It is concluded that irradiation may induce decomposition preferentially along damage tracks and such a mechanism may result in linear kinetics. Irradiation may also introduce mechanical defects resulting from large strains imposed on the crystal by decomposition products. (C.H.)

Effect of Beta-Radiation on Mitotic Activity in the Skin of the Young Rat

Effect of Beta-Radiation on Mitotic Activity in the Skin of the Young Rat

The Effect of Beta Radiation on Corneal Healing

The Effect of Beta Radiation on Corneal Healing

Beta Irradiation of the Eye

Recent reports and discussion of the value and dangers of irradiation of the eye with the beta rays of radon have been both enthusiastic and pessimistic. The present uncertainty can be attributed to many factors, among which may be mentioned : ( 1 ) Variability in dosage and technique of application, with too little attention being paid to the characteristics of the irradiation used, the distance of the applicator from the eye, localization of the area to be treated, and possible cumulative effects; (2) ignorance of the differential sensitivity of the normal tissues of the eye and those tissues which are to be destroyed by irradiation; and (3) difficulty in comparing the results of beta treatment with untreated controls. Often the beta irradiation clinic becomes a convenient spot to which hopeless cases can be referred regardless of theoretical or practical justification. In this paper, the various techniques and effects of beta irradiation will be discussed in an effort to arrive at a selection of suitable cases for treatment, and to utilize a dose sufficiently large to destroy undesirable tissue without undue damage to the normal structures of the eye. In addition, we will report some preliminary experiments on the use of beta irradiation following chemical burns of the eye, especially in regard to vascularization of the cornea.

The Detection of Beta-Radiation by Photographic Film

The effect of beta-radiation from C14 has been examined on nineteen different films. The method employed uses a ``radiator,'' a set of eight radiating sources of different intensities, to replace the stable light source and absorbing wedge common in spectral photometry. With this device sensitivity and contrast of the nineteen films have been measured. Based upon these results and a microscopic estimation of grain size, recommendations are made for the most desirable film for use in radioautography and detection of radioactivity. Of the films examined, Eastman No-Screen x-ray film appears best for the detection of the beta-rays, and Ansco Reprolith, and Eastman Type M x-ray stripping films appear to be most desirable for work with radioautographs.