Physics Chapter 35

20問 • 1年前

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通報

問題一覧

Health physics is concerned with minimizing radiation dose to _____________.

All of the options

The first radiation health physicists worked with ________.

the atom bomb

The three cardinal principals of radiation protection involve _________.

time, distance, and shielding

Exposure is measured by multiplying ______ by ________.

exposure rate; exposure time

If a technologist is exposed to 4 mGyt/hr for 45 minutes during a fluoroscopy exam, what will be her total exposure?

3 mGyt

When using the inverse square law during fluoroscopy, the patient should be considered a(n) ________ source of radiation.

point

If a technologist is receiving 2 mGyt/hr standing 1 foot from the patient during fluoroscopy, what is his rate of exposure when he steps back to a distance of 2 feet from the patient?

0.50 mGyt/hr

A tenth-value layer is equal to _____ half-value layers.

3.3

f the HVL in a radiology department is 0.25 mm Pb, then how thick should a shield be to reduce the technologists’ exposure to one fourth the incident scatter?

0.5 mm Pb

What is the NCRP?

National Council of Radiation Protection

The NCRP makes _____ regarding dose limits.

recommendations

The dose limits established by the NCRP are derived from _________.

BEIR and NSC reports

The NCRP publishes annual dose limits for ________ exposure.

Public, occupational and prenatal

Dose limits are based on a _____ dose-response relationship to radiation.

linear, nonthreshold

The dose limit for the general public is _____ the dose limit for occupational exposure.

1/10

The concept of effective dose accounts for the _________.

different types of radiation and RBE and relative radiosensitivity of various tissues and organs

What is the best approach to occupational radiation exposure?

Follow the concept of ALARA.

Exposure = Exposure rate x Exposure time

True

One TVL is the thickness of absorber that reduces the radiation intensity to one-half its original value.

False

Effective dose is the equivalent whole-body dose following partial- body radiation exposure.

True

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問題一覧

Health physics is concerned with minimizing radiation dose to _____________.

All of the options

The first radiation health physicists worked with ________.

the atom bomb

The three cardinal principals of radiation protection involve _________.

time, distance, and shielding

Exposure is measured by multiplying ______ by ________.

exposure rate; exposure time

If a technologist is exposed to 4 mGyt/hr for 45 minutes during a fluoroscopy exam, what will be her total exposure?

3 mGyt

When using the inverse square law during fluoroscopy, the patient should be considered a(n) ________ source of radiation.

point

If a technologist is receiving 2 mGyt/hr standing 1 foot from the patient during fluoroscopy, what is his rate of exposure when he steps back to a distance of 2 feet from the patient?

0.50 mGyt/hr

A tenth-value layer is equal to _____ half-value layers.

3.3

f the HVL in a radiology department is 0.25 mm Pb, then how thick should a shield be to reduce the technologists’ exposure to one fourth the incident scatter?

0.5 mm Pb

What is the NCRP?

National Council of Radiation Protection

The NCRP makes _____ regarding dose limits.

recommendations

The dose limits established by the NCRP are derived from _________.

BEIR and NSC reports

The NCRP publishes annual dose limits for ________ exposure.

Public, occupational and prenatal

Dose limits are based on a _____ dose-response relationship to radiation.

linear, nonthreshold

The dose limit for the general public is _____ the dose limit for occupational exposure.

1/10

The concept of effective dose accounts for the _________.

different types of radiation and RBE and relative radiosensitivity of various tissues and organs

What is the best approach to occupational radiation exposure?

Follow the concept of ALARA.

Exposure = Exposure rate x Exposure time

True

One TVL is the thickness of absorber that reduces the radiation intensity to one-half its original value.

False

Effective dose is the equivalent whole-body dose following partial- body radiation exposure.

True