RELATIVE BIOLOGICAL EFFECTIVENESS OF 200 kvp. X-RAYS, Co$sup 60$ $gamma$- RAYS AND Cs$sup 137$ $gamma$-RAYS ON THE SEVEN-DAY OLD CHICK EMBRYO

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Nippon Igaku Hoshasen Gakkai Zasshi (Japan)

OSTI ID:4785221

Kozuka, T

RBE values obtained on the basis of LD/sub 60/ doses of these radiations were as follows: x rays (60.5 rads/min) = 1.43, (26.2 rads/min) = 1.37; Co/sup 60/ gamma rays (24.6 rads/min) = 1.00; and Cs/sup 137/ gamma rays (23.3 rads/min) = 0.94. On the semilogarithmic graph, the mean value of the body weight of growing chick embryos in normal conditions increases rectilinearly from the 7th day to the l3th day after incubation. In relation to this trend, it was found that a single exposure of 400 rads of these radiations retarded the daily increase of the body weight of the growing chick embryo and that the trend of retardation was different in each radiation group. Ln the x irradiated group the onset of retardation was found at 3 days after exposure and in the gamma -ray groups 1 day later. The retardation curve for the Cs/sup 137/ gamma -ray group was seen to lie between the curves of the x-ray and Co/sup 60/ gamma -ray groups and was more similar to that of Co/sup 60/ gamma -ray group. On the basis of these two reequivalently with Co/sup 60/ gamma rays in practical use. (Abstr. Japan Med., 2, No. 1, Jan. 1962)

• Research Organization: Osaka Univ. Medical School
• NSA Number: NSA-16-014551
• OSTI ID: 4785221
• Journal Information: Nippon Igaku Hoshasen Gakkai Zasshi (Japan), Journal Name: Nippon Igaku Hoshasen Gakkai Zasshi (Japan) Vol. Vol: 20; ISSN NHGZA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
BIRDS
BODY
CESIUM 137
COBALT 60
EMBRYOS
GAMMA RADIATION
LETHAL DOSE
RADIATION EFFECTS
WEIGHT
X RADIATION