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Flashcards in 4.3 Deck (24):
1

Geiger counter used for?
what does it detect?

used to measure radiation
detects beta and gamma radiation

2

how does a geiger counter detect?

using ions produced by radiation to create an electrical current

3

Units of radiation (metric and SI)

curie (becquerel)
rad (Gray)
rem (sievert)

4

curie (Ci)
(what does it measure?)

measures (radio)activity/disintegration using
decay in 1sec/1gram of radium

5

rad (radiation absorbed dose)
(what does it measure?)

measures radiation absorbed by tissues of the body

6

rem (radiation equivalent)
(what does it measure?)

measures biological damage from different types of radiation.

7

becquerel (Bq)
(SI unit of? precise measurements?)

SI unit of curie,
measures 1 disintegration per second

8

gray (Gy)
(SI unit of? precise measurements?)

SI unit of rad,
joules of energy absorbed by 1 kg of body tissue

9

sievert (Sv)
(SI unit of?)

SI unit of rem,

10

1 Ci= __Bq

1 Ci= 3.7 x 10^10Bq

11

1 Gy=__rad

1 Gy= 100 rad

12

1 Sv=__rem

1 Sv= 100 rem

13

formula to calculate biological damage?

biological damage (rem)= absorbed dose(rads) x factor

14

Gamma ray and Beta particle: factor

1

15

alpha particle: factor

20

16

high energy protons and neutrons: factor

10

17

where do you get exposure to radiation?

medical/dental procedures
air travel, radon, cigarettes
naturally occurring isotopes (potassium-40)

18

How much radiation would be considered undetected?

25 rem

19

What happens to a body that is exposed to 1 Sv (100 rem) of radiation?

temporary decrease in white blood cells

20

what happens to a body that is exposed to more than 1 Sv (100 rem) of radiation?

radiation sickness

21

what happens to a body that is exposed to 5 Sv (500 rem) or more of radiation?

death in 50% of population

22

LD50

lethal dose to one-half of the population

23

does every life form have the same LD50?

No

24

how much whole body radiation would be fatal to humans?

6 Sv or greater