TNAG-1508-FCO40-2066-Guangdong-nuclear-power-station-project-at-Daya-Bay-safety-c-1987 — Page 78

and

items such as

high-pressure

containers which

very thick require electronic induction accelerators.

(4) Neutron radiography: Neutrons have high penetrative force for

matter with a high atomic number,

but are easily absorbed by

and

matter

with

low atomic number such as a

lithium. This characteristic is employed

boron hydrogen,

to examine the hydrogen

content of the external casing of metals with

number.

(5)

a high atomic

Industrial CT: Industrial CT technology refers to industrial

computerized

fault displaying

technology,

achievement in nuclear non-destructive test technology.

which is

a

new

It has

brought non-destructive

flaw detection to a new level

of all

round

suitable capability,

for

in detection

all

sorts

of

complicated situations.

6. Analysis instruments

in

We have described a number of analysis instruments used nuclear analysis technology. Self-contained units for on-site use

generally consist of radio-isotope X-ray

fluorescence analysis

intruments or various types of logging instrument.

(1) Radio-isotope X-ray fluorescence analysis instruments: These

use

a radiation source to irradiate the sample to be

The matter in the sample can be stimulated

measured.

to give off the

characteristic X-radiation of a particular element. The energy of

the characteristic X-radiation is connected with the element. Its

strength is connected with the content of the element.

be

This can

matter and

used to determine the constituents of a piece of their respective amounts. X-ray fluorescence analysis instrument

can

be used in ore prospecting,

6

in the laboratory and for

"on-