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NM Radiation Safety

Authored by Deon Meadows

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Professional Development

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NM Radiation Safety
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31 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

The inverse square law in words, says:

If you double the distance from the source of activity, you reduce exposure to 25% of the original activity.

If you halve the distance from the source of activity, you decrease exposure to 25% of the original activity.

If you halve the distance from the source of activity, you increase exposure to 25% of the original activity.

If you double the distance from the source of activity, you reduce exposure to 50% of the original activity.

Answer explanation

By doubling the distance, the intensity is reduced to one quarter of the original activity, as shown in the formula below, where I1 is the original intensity, I2 is the new intensity, d1 is the original distance from the source , and d2 is the new distance from the source.

I1 = (d2)2/I2 = (d1)2

rearranged as

(I1)(D1)2 = (I2)(D2)2 for easy solving

2.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which of the following should be used when administering an intravenous pharmaceutical to a patient?

Lead syringe shield

Leaded eyeglasses

Gloves

(a) and (b) only

Answer explanation

Pharmaceutical not radiopharmaceutical

3.

FILL IN THE BLANK QUESTION

1 min • 5 pts

What is the dose rate limit at the package surface for a Yellow III radioactive package?

4.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Gaseous radiopharmaceuticals may only be used in rooms that:

Have heating/cooling capibilities

Contain wall oxygen

Are at positive pressure compared to surrounding rooms

Are at negative pressure compared to surrounding rooms

Answer explanation

Airborne radiation such as aerosols or gasses should be administered in rooms that are at negative pressure to surrounding areas

5.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

A type A package bears a DOT Class II Yellow radioactive label, has a transport index of 0.8 and contains 10mCi of In111 oxine. What is the exposure rate at 3 ft from the package?

0.4 mR/h

0.8 mR/h

10 mR/h

Cannot be determined from the given information

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the transport index maximum of a White I radioactive package?

Background

0.5 mR/hr

Less than or equal to 0.5 mR/hr

1 mR/hr

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the annual dose limit allowed to the lens of the eye?

1.5 mrem

15 rem

50 rem

5 mrem

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