Question

Sr-90 causes
a. Bone and blood cancer
b. Skin Cancer
c. Lung Tumour
d. All of the above

Answer 1

Sr-90 is radioactive strontium which can easily pass from one person to another. It is generally released in the atmosphere through the atomic testing or by the atomic weapons. It can easily enter the food chain through soil.

Complete answer:
To solve this question, we must know about the Sr-90 effects on the body.
Sr-90 is a radioactive metal which is released to the environment by the atomic weapons or atomic testing. It gets incorporated in the soil. The soil plants growing in this area absorb this metal. These plants when eaten up by the animals attain the Sr from the plants and ultimately it enters the food chain.

Though the food chain it can enter the human body. Sr-90 is similar to the calcium for the human body. It easily gets deposited in the bone and bone marrow. The bone marrow are the blood synthesising tissues of our body. This can lead to the mutations and ultimately leads to bone cancer and leukaemia which is also known as blood cancer.

Skin Cancer- It is caused by the excessive exposure of ultraviolet radiations. It is also known as melanoma. It is the most serious type of cancer.

Lung Tumour- This is caused by smoking or by being continuously exposed to air pollutants. Not all tumours are cancerous.

Hence the correct answer is option (a).

Note: The bone cancer can start to develop in any bone of the body but generally it starts developing in the long bones of arms and legs. The blood cancer begins in the blood developing cells of the bone marrow. Blood cancer is fatal.