Controlling Dose Flashcards

1
Q

What are the 3 basic ways to protect yourself from radiation?

A

Time

Distance

Shielding

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2
Q

How do we calculate intensity?

A
  1. Use a survey meter.
  2. Apply Characteristic Intensity to the activity of the source

eg. Cobalt 60 = 0.36 mSv/h per GBq @ 1m

1000 GBq of Cobalt 60 = 1000 x 0.36 = 360 mSv/hr

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3
Q

What is the formula for determining Dose?

A

Dose = Intensity x Time

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4
Q

Which formula is used to determine
Intensity as a Function of Distance?

A

Inverse Square Formula

I1 = Original intensity

I2 = New intensity

D2 = New Distance

D1 = Original Distance

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5
Q

How many mSv/hr are allowed at a radiation barrier?

A

0.1

(as per CNSC Regulations)

Substance & Radiation Devices section 18 (1)(j)

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6
Q

How many mSv/hr are allowed within a storage area?

A

0.025

(as per CNSC Regulations)

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7
Q

How many mSv/hr are allowed on the surface of a device?

A

2

before use or upon installation of a new source

(as per CNSC Regulations)

Substance & Radiation Devices section 30 (4)(b)

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8
Q

How often does a survey meter need to be calibrated?

A

Once every 12 months.

(as per CNSC Regulations)

Facilities & Prescribed Equipment section 18 (1)(a)

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9
Q

At what interval should a leak test be performed?

A

Once per year or upon installation of a new source.

(as per CNSC Regulations)

Substance & Radiation Devices section 18 (1)(3)

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10
Q

What length do long handled tongs need to be?

A

1.5 metres minimum

(as per CNSC Regulations)

Substance & Radiation Devices Section 31 (1)(b)(iii)

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11
Q

Audible Dosimeters need to alarm at these two levels.

A

5 mSv/hr
or when dose reaches 2 mSv

(as per CNSC Regulations)

Substance & Radiation Devices section 31 (1)(f)(ii)

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12
Q

What material does a source tag need to be made of?

A

Steel or Brass

(as per CNSC Regulations)

Substance & Radiation Devices section 30 (1)(a)

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13
Q

What range does a survery meter need to be able to measure?

A

20 µSv - 100 mSv/hr

(as per CNSC Regulations)

Substance & Radiation Devices section 31 (1)(a)(i)

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