1
00:00:00,480 --> 00:00:03,360
Speaker 1: Welcome to brain Stuff from how stuff works dot com.

2
00:00:03,560 --> 00:00:08,399
Speaker 1: We're Smart Happens Hi, I'm Marshall Brain. We take X

3
00:00:08,520 --> 00:00:11,280
Speaker 1: rays at the doctor's office for granted, but they really

4
00:00:11,280 --> 00:00:14,760
Speaker 1: are pretty amazing. The idea of being able to see

5
00:00:14,800 --> 00:00:17,960
Speaker 1: through the human body is pretty cool. And X ray

6
00:00:18,000 --> 00:00:21,480
Speaker 1: machine is essentially a camera, but instead of visible light,

7
00:00:21,560 --> 00:00:25,200
Speaker 1: it uses X rays to expose the film. X rays

8
00:00:25,200 --> 00:00:28,800
Speaker 1: are like light in that they are electromagnetic waves, but

9
00:00:28,840 --> 00:00:31,520
Speaker 1: there are a lot more energetic than light waves, so

10
00:00:31,760 --> 00:00:35,720
Speaker 1: X rays can penetrate many materials to varying degrees. When

11
00:00:35,720 --> 00:00:38,599
Speaker 1: the X rays hit the film, they expose it just

12
00:00:38,720 --> 00:00:43,440
Speaker 1: as lightwood. Since bone, fat, muscle, tumors, and other masses

13
00:00:43,479 --> 00:00:46,760
Speaker 1: inside the body all absorb X rays at different levels,

14
00:00:47,040 --> 00:00:50,080
Speaker 1: the image on the film lets you see different structures

15
00:00:50,080 --> 00:00:53,640
Speaker 1: inside the body because of the different levels of exposure

16
00:00:53,720 --> 00:00:56,960
Speaker 1: on the film. Do you have any ideas or suggestions

17
00:00:57,000 --> 00:00:59,880
Speaker 1: for this podcast? If so, please send me an email.

18
00:01:00,200 --> 00:01:03,240
Speaker 1: Podcast at how stuff works dot com. For more on

19
00:01:03,360 --> 00:01:05,720
Speaker 1: this and thousands of other topics, go to how stuff

20
00:01:05,720 --> 00:01:08,760
Speaker 1: works dot com. M H m HM