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An Electron Microscopic Study On The Cobalt-60 Irradiation Effects On The Salivary Gland Of The White Rat

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Abstract

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½ÇÇ豺 1, 2, 3±ºÀ¸·Î ºÐ·ùÇÏ°í ´ëÁ¶±ºÀº 6¸¶¸® ½ÇÇ豺Àº 24¸¶¸®¾¿ ³ª´©¾î, 6,000curies MeV
ÇÁ¶û½ºÁ¦ ALCYON Cobalt-60Ä¡·á±â¸¦ »ç¿ëÇÏ¿© Á¶»ç°Å¸® 80cm¿¡¼­ ¸Å ºÐ ´ç 183rads·Î
½ÇÇ豺 ¹é¼­µÎ°æºÎ¿¡ °¢°¢ ÃÑ Á¶»ç·® 1,200rads, 2,400rads, 4,800rads¸¦ 1ÀÏ 1ȸ 600rads¾¿ 3
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3. ¹æ»ç¼±°¨¼ö¼ºÀÌ ¿¹¹ÎÇÑ ¼øÀ¸·Î´Â ÀÌÇϼ±Àå¾×¼¼Æ÷, ¾ÇÇϼ±ÀåÁ¡¾×¼¼Æ÷, ºÐºñ¼Ò°ü¼¼Æ÷ÀÇ
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5. Àü ½ÇÇ豺À» ÅëÇÏ¿© ¹Ì¼¼Ç÷°üÀÇ ¼Õ»ó¼Ò°ßÀÌ ¾ø¾î ¹Ì¼¼Ç÷°üÀÇ ¼Õ»óÀÌ Å¸¾×¼±¿¡ Á¶±â¼Õ
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#ÃÊ·Ï#
This study was undertaken to observe the histopathologic changes in salivary gland
of the white rats when exposed to megavoltage fractionated dose of cobalt-60 irradiation
and 78 female white rats, weighing approximately 180gm, were divided into control and
3 experimental groups.
Irradiation on experimental groups was delivered by using 6000 curies MeV ALCYON
cobalt-60 teletherapy unit with exposure rate 183 rads per minute, in source skin
distance 80cm, 600rads every 3 days. In experimental groups, Group I was irradiated of
total dose 1200 rads for a period of 6 days, Group ¥± was irradiated of total dose 2400
rads for a period of 12 days and Group ¥² was irradiated of total dose of 4800 rads for
a period of 24 days.
The animals were sacrificed serially at 3 hours, 6 hours, 10 hours, 1st day, 4th day,
7th day after each completion of irradiation exposure. At sacrifice, salivary glands were
excised and examined microscopically and electromicroscopically.
The results were as follows :
1. The acinar cells of parotid and submaxillary gland showed damage varied with
dose, 1200 rads resulted in very mild injury while 4800 rads caused most extensive
injury.
2. The acinar cells of parotid and submandibular gland showed similar ultrastructural
alterations, appeared as pleomorphic nucleus, decreased numbers and pleomorphism of
secretory granules, distention of rough endoplasmic reticulum, expansion and pallor
appearance of mitochondria, and hypertrophy of Golgi complex.
3. carotid serous cells were the most sensitive components, displaying morphological
alterations of radiation damage as early as 3 hours, followed by submandibular
seromucinous cells and secretory tubular cells.
4. The mucous cells of sublingual gland, as well as the whole ductal lining cells of
each salivary gland, displayed no significant alterations.
5. No evidence of microvascular injury through whole experimental groups indicated
that microvascular impairment does not contribute to early salivary gland injury.

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