Untitled1_34 - Leukemia Bone cancer Thyroid cancer Lung...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Unit 1 Fundamental Concepts 1-17 Life-Shortening The evidence regarding life-shortening is derived mainly from animal experiments where radiation has been demonstrated to shorten lifespan. The aging process is complex and largely obscure; and the exact mechanisms involved in it are yet uncertain. Irradiated animals in these investigations appear to die of the same diseases as nonirradiated animals, but they do so at an earlier age. How much of the total effect is due to premature aging and how much to an increased incidence of radiation-induced diseases is still unresolved. However, data from the populations of Hiroshima and Nagasaki indicate that, if life-shortening occurs it is very slight, less than 1 year per 100 R. Table 1-4 shows typical latent periods between exposure and effect. Table 1-4 Long-Term Effects of Radiation Effect Effect Mean Latent Mean Latent Period (years) Evidence
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Leukemia Bone cancer Thyroid cancer Lung cancer Life-shortening Cataract formation 2-4 15 15-30 10-20 Not applicable 1-5 Atomic bomb casualties Medical x-ray treatment Radium luminous dial painters Atomic bomb casualties Medical treatment Mine workers Experiments with mice Atomic bomb casualties EXPOSURE CONTROL TECHNIQUES There are three important factors in protecting individuals from radiation: time , distance , and shielding . The time factor means that the less time an individual remains in a radiation field, the less exposure that individual will receive. The figure below shows the effect of time spent in a field of 100 mR/hr. If you remain in a 100 mR/hr field of radiation for 1 hour, you will be exposed to 100 mR. If you remain in the same 100 mR/hr field for 3 hours, you will be exposed to 300 mR (3 x 100)....
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online