"Tobacco Plants Are Grown in Soils with High-Phosphate Fertilizers That $\alpha$

question 161

Multiple Choice

"Tobacco plants are grown in soils with high-phosphate fertilizers that are naturally contaminated with the alpha-particle emitting radionuclide polonium-210.In one year, the average smoker will irradiate the bronchial epithelium with 8 to 9 rem, the equivalent dose of radiation from 250 to 300 chest X-ray films per year" (Pediatrics, September 1993, p.464) .How many grays is equivalent to 8.5 rem for $\alpha$ particle emission? (RBE for $\alpha$ particles =20)

• A)43 Gy
• B)0.0043 Gy
• C)1.7 Gy
• D)850 Gy
• E)0.085 Gy

---

Definitions:

Money Market Funds

Investment funds that invest in short-term debt securities, such as treasury bills and commercial paper, offering investors high liquidity with a relatively low level of risk.

Prime Institutional

High-quality services or investment products catered to large institutional investors, typically offering premier levels of performance and service.

Construction Loans

Short-term loans used to finance the building of a property, with funds released incrementally as construction progresses.

Mortgage Trust

A type of investment trust that pools mortgage loans, offering investors a share in the income generated from these mortgages.